Gravity Basics
Bonus Multiplier: 4×
Question Type: Multiple Choice
Question: Which way does gravity pull things?
A. It does not pull
B. Sideways
C. Down
D. Up
Correct Answer: C. Down
Bonus Score: 100 × 4 = 400 points
Bonus Multiplier: 6×
Question Type: Matching
Match the items: Match each word with its meaning.
1. Fall
2. Drop
3. Apple
a. To move down quickly
b. A fruit that can fall from a tree
c. To let something fall
Correct Answer: 1. Fall → a. To move down quickly; 2. Drop → c. To let something fall; 3. Apple → b. A fruit that can fall from a tree
Bonus Score: 100 × 6 = 600 points
Bonus Multiplier: 3×
Question Type: Fill in the Blank
Fill in the blank: Astronauts float in ______.
Correct Answer: space
Bonus Score: 100 × 3 = 300 points
Bonus Multiplier: 3×
Question Type: Matching
Match the items: Match each word with its meaning.
1. Push
2. Opposite
3. Equal
a. The same
b. To move something away
c. Going in different directions
Correct Answer: 1. Push → b. To move something away; 2. Opposite → c. Going in different directions; 3. Equal → a. The same
Bonus Score: 100 × 3 = 300 points
Bonus Multiplier: 3×
Question Type: Multiple Choice
Question: Which word means 'the forces are equal and the object does not move'?
A. Unbalanced
B. Smooth
C. Rough
D. Balanced
Correct Answer: D. Balanced
Bonus Score: 100 × 3 = 300 points
Bonus Multiplier: 5×
Question Type: One-Word Answer
Question: What force slows things down when two surfaces touch?
Correct Answer: Friction
Bonus Score: 100 × 5 = 500 points
Bonus Multiplier: 2×
Question Type: Matching
Match the items: Match each word with its meaning.
1. Rough
2. Smooth
3. Grip
a. Soft, flat, no bumps
b. To hold tightly
c. Not smooth
Correct Answer: 1. Rough → c. Not smooth; 2. Smooth → a. Soft, flat, no bumps; 3. Grip → b. To hold tightly
Bonus Score: 100 × 2 = 200 points
Bonus Multiplier: 2×
Question Type: One-Word Answer
Question: What word means 'to lose balance and fall'?
Correct Answer: Slip
Bonus Score: 100 × 2 = 200 points
Bonus Multiplier: 5×
Question Type: One-Word Answer
Question: What is the name of the invisible pull that makes a dropped pencil fall?
Correct Answer: Gravity
Bonus Score: 200 × 5 = 1,000 points
Bonus Multiplier: 3×
Question Type: Fill in the Blank
Fill in the blank: When I drop a ball, it ______.
Correct Answer: falls
Bonus Score: 200 × 3 = 600 points
Bonus Multiplier: 4×
Question Type: True or False
Statement (True or False): The Moon orbits Earth.
Correct Answer: True
Bonus Score: 200 × 4 = 800 points
Bonus Multiplier: 4×
Question Type: Multiple Choice
Question: What is the total effect of all forces on an object called?
A. Resultant force
B. Friction
C. Weight
D. Gravity
Correct Answer: A. Resultant force
Bonus Score: 200 × 4 = 800 points
Bonus Multiplier: 6×
Question Type: Matching
Match the items: Match each word with its meaning.
1. Balanced
2. Unbalanced
3. Resultant force
a. Forces are unequal, object moves
b. The total force on an object
c. Forces are equal, object does not move
Correct Answer: 1. Balanced → c. Forces are equal, object does not move; 2. Unbalanced → a. Forces are unequal, object moves; 3. Resultant force → b. The total force on an object
Bonus Score: 200 × 6 = 1,200 points
Bonus Multiplier: 4×
Question Type: Multiple Choice
Question: Friction is a force that happens when two ______ touch.
A. magnets
B. clouds
C. surfaces
D. planets
Correct Answer: C. surfaces
Bonus Score: 200 × 4 = 800 points
Bonus Multiplier: 6×
Question Type: One-Word Answer
Question: Which surface has more friction: rough or smooth?
Correct Answer: Rough
Bonus Score: 200 × 6 = 1,200 points
Bonus Multiplier: 5×
Question Type: Multiple Choice
Question: Which word means 'how heavy something is'?
A. Grip
B. Weight
C. Space
D. Brake
Correct Answer: B. Weight
Bonus Score: 200 × 5 = 1,000 points
Bonus Multiplier: 2×
Question Type: Fill in the Blank
Fill in the blank: Gravity keeps us on ______.
Correct Answer: Earth
Bonus Score: 300 × 2 = 600 points
Bonus Multiplier: 4×
Question Type: One-Word Answer
Question: What do we call a person who travels in space?
Correct Answer: Astronaut
Bonus Score: 300 × 4 = 1,200 points
Bonus Multiplier: 3×
Question Type: Matching
Match the items: Match each one with what it does or is.
1. The Moon
2. Earth
3. An astronaut
a. orbits the Sun
b. travels in space
c. orbits Earth
Correct Answer: 1. The Moon → c. orbits Earth; 2. Earth → a. orbits the Sun; 3. An astronaut → b. travels in space
Bonus Score: 300 × 3 = 900 points
Bonus Multiplier: 2×
Question Type: One-Word Answer
Question: What word means 'the act of moving'?
Correct Answer: Motion
Bonus Score: 300 × 2 = 600 points
Bonus Multiplier: 2×
Question Type: True or False
Statement (True or False): If one person pushes harder than the other, the forces are balanced.
Correct Answer: False
Bonus Score: 300 × 2 = 600 points
Bonus Multiplier: 3×
Question Type: True or False
Statement (True or False): Rubbing your hands together makes heat because of friction.
Correct Answer: True
Bonus Score: 300 × 3 = 900 points
Bonus Multiplier: 5×
Question Type: Multiple Choice
Question: What can happen to a person on a wet floor with little friction?
A. They float up
B. They can slip
C. They grip the floor
D. They orbit the floor
Correct Answer: B. They can slip
Bonus Score: 300 × 5 = 1,500 points
Bonus Multiplier: 4×
Question Type: Fill in the Blank
Fill in the blank: A ______ is a tool to stop cars and bikes.
Correct Answer: brake
Bonus Score: 300 × 4 = 1,200 points
Bonus Multiplier: 6×
Question Type: One-Word Answer
Question: What one word means 'a push or a pull'?
Correct Answer: Force
Bonus Score: 400 × 6 = 2,400 points
Bonus Multiplier: 5×
Question Type: True or False
Statement (True or False): A ball you throw up always comes back down.
Correct Answer: True
Bonus Score: 400 × 5 = 2,000 points
Bonus Multiplier: 6×
Question Type: One-Word Answer
Question: What word do we use when something keeps circling around a bigger object?
Correct Answer: Orbit
Bonus Score: 400 × 6 = 2,400 points
Bonus Multiplier: 6×
Question Type: True or False
Statement (True or False): If two equal forces act in opposite directions, the object will not move.
Correct Answer: True
Bonus Score: 400 × 6 = 2,400 points
Bonus Multiplier: 5×
Question Type: Matching
Match the items: Match each situation with what happens.
1. Tug of war: both teams are equal
2. Tug of war: one team is stronger
3. Two people lift a table equally
a. The rope moves
b. The table rises smoothly
c. The rope stays still
Correct Answer: 1. Tug of war: both teams are equal → c. The rope stays still; 2. Tug of war: one team is stronger → a. The rope moves; 3. Two people lift a table equally → b. The table rises smoothly
Bonus Score: 400 × 5 = 2,000 points
Bonus Multiplier: 2×
Question Type: Fill in the Blank
Fill in the blank: Friction always acts ______ to the direction of motion.
Correct Answer: opposite
Bonus Score: 400 × 2 = 800 points
Bonus Multiplier: 4×
Question Type: Matching
Match the items: Match each example with the correct word.
1. Sandpaper
2. Glass
3. A wet floor
a. Smooth
b. Rough
c. Slip
Correct Answer: 1. Sandpaper → b. Rough; 2. Glass → a. Smooth; 3. A wet floor → c. Slip
Bonus Score: 400 × 4 = 1,600 points
Bonus Multiplier: 3×
Question Type: True or False
Statement (True or False): Fall means to move up quickly.
Correct Answer: False
Bonus Score: 400 × 3 = 1,200 points
Bonus Multiplier: 4×
Question Type: Matching
Match the items: Match each thing with what gravity does.
1. The Moon
2. River water
3. Air and oceans
a. would float away without gravity
b. stays in orbit around Earth
c. flows down to the sea
Correct Answer: 1. The Moon → b. stays in orbit around Earth; 2. River water → c. flows down to the sea; 3. Air and oceans → a. would float away without gravity
Bonus Score: 500 × 4 = 2,000 points
Bonus Multiplier: 6×
Question Type: Multiple Choice
Question: A student drops a coin, an eraser, and a piece of paper. What force pulls all three down?
A. Resultant force
B. Friction
C. Heat
D. Gravity
Correct Answer: D. Gravity
Bonus Score: 500 × 6 = 3,000 points
Bonus Multiplier: 2×
Question Type: Fill in the Blank
Fill in the blank: The Moon's gravity is ______ than Earth's gravity.
Correct Answer: weaker
Bonus Score: 500 × 2 = 1,000 points
Bonus Multiplier: 3×
Question Type: Fill in the Blank
Fill in the blank: Resultant force is also called ______ force.
Correct Answer: net
Bonus Score: 500 × 3 = 1,500 points
Bonus Multiplier: 2×
Question Type: Multiple Choice
Question: Two friends push a box from opposite sides. One friend pushes harder. What happens?
A. The box moves in the direction of the weaker push
B. The box moves in the direction of the stronger push
C. The box floats up
D. The box does not move
Correct Answer: B. The box moves in the direction of the stronger push
Bonus Score: 500 × 2 = 1,000 points
Bonus Multiplier: 6×
Question Type: True or False
Statement (True or False): Friction only makes things move faster.
Correct Answer: False
Bonus Score: 500 × 6 = 3,000 points
Bonus Multiplier: 5×
Question Type: Multiple Choice
Question: Why do shoes have rubber soles?
A. The rubber makes heat for your feet
B. The rough rubber grips the ground
C. The rubber makes the ground smooth
D. The rubber makes shoes float
Correct Answer: B. The rough rubber grips the ground
Bonus Score: 500 × 5 = 2,500 points
Match the items: Match each word with its meaning.
1. Heat
2. Surface
3. Stop
a. To not move
b. Warmth made by rubbing
c. The outside of something
Correct Answer: 1. Heat → b. Warmth made by rubbing; 2. Surface → c. The outside of something; 3. Stop → a. To not move
Bonus Score: 500 × 5 = 2,500 points
Bonus Multiplier: 6×
Question Type: True or False
Statement (True or False): Gravity works only some of the time.
Correct Answer: False
Bonus Score: 600 × 6 = 3,600 points
Bonus Multiplier: 2×
Question Type: Matching
Match the items: Match each thing with what happens.
1. Rain
2. A schoolbag you drop
3. A ball you throw up
a. lands on the floor
b. falls from clouds
c. comes back down
Correct Answer: 1. Rain → b. falls from clouds; 2. A schoolbag you drop → a. lands on the floor; 3. A ball you throw up → c. comes back down
Bonus Score: 600 × 2 = 1,200 points
Bonus Multiplier: 5×
Question Type: One-Word Answer
Question: What is the name of the planet that orbits the Sun and is our home?
Correct Answer: Earth
Bonus Score: 600 × 5 = 3,000 points
Bonus Multiplier: 6×
Question Type: Multiple Choice
Question: Two friends push a box from opposite sides with the same force. What happens to the box?
A. It moves right
B. It moves left
C. It does not move
D. It floats up
Correct Answer: C. It does not move
Bonus Score: 600 × 6 = 3,600 points
Bonus Multiplier: 5×
Question Type: Fill in the Blank
Fill in the blank: Balanced forces are equal in size and ______ in direction.
Correct Answer: opposite
Bonus Score: 600 × 5 = 3,000 points
Bonus Multiplier: 2×
Question Type: Matching
Match the items: Match each kind of friction with its example.
1. Sliding friction
2. Rolling friction
3. Fluid friction
a. A fish swimming in water
b. A ball rolling on the ground
c. A book sliding on a table
Correct Answer: 1. Sliding friction → c. A book sliding on a table; 2. Rolling friction → b. A ball rolling on the ground; 3. Fluid friction → a. A fish swimming in water
Bonus Score: 600 × 2 = 1,200 points
Bonus Multiplier: 3×
Question Type: True or False
Statement (True or False): Walking on sand is harder than walking on tiles because sand gives more friction.
Correct Answer: True
Bonus Score: 600 × 3 = 1,800 points
Bonus Multiplier: 2×
Question Type: Multiple Choice
Question: Which word means 'something that stops movement'?
A. Equal
B. Attract
C. Space
D. Resistance
Correct Answer: D. Resistance
Bonus Score: 600 × 2 = 1,200 points
Bonus Multiplier: 3×
Question Type: Fill in the Blank
Fill in the blank: Gravity pulls objects toward the ______ of the Earth.
Correct Answer: center (also accept: middle)
Bonus Score: 700 × 3 = 2,100 points
Bonus Multiplier: 3×
Question Type: One-Word Answer
Question: Apples and coconuts fall from trees when they are what? (one word)
Correct Answer: Ripe
Bonus Score: 700 × 3 = 2,100 points
Bonus Multiplier: 2×
Question Type: Multiple Choice
Question: Why can astronauts hop higher on the Moon?
A. The Moon's gravity is weaker
B. The Moon has more friction
C. The Moon's gravity is stronger
D. The Moon has no forces at all
Correct Answer: A. The Moon's gravity is weaker
Bonus Score: 700 × 2 = 1,400 points
Bonus Multiplier: 2×
Question Type: True or False
Statement (True or False): To find the resultant force, we only add forces and never subtract.
Correct Answer: False
Bonus Score: 700 × 2 = 1,400 points
Bonus Multiplier: 4×
Question Type: True or False
Statement (True or False): Unbalanced forces can happen when two forces act in the same direction.
Correct Answer: True
Bonus Score: 700 × 4 = 2,800 points
Bonus Multiplier: 5×
Question Type: Multiple Choice
Question: Which kind of friction keeps an object from starting to move?
A. Static
B. Fluid
C. Sliding
D. Rolling
Correct Answer: A. Static
Bonus Score: 700 × 5 = 3,500 points
Bonus Multiplier: 2×
Question Type: Fill in the Blank
Fill in the blank: A smooth surface has ______ friction.
Correct Answer: less
Bonus Score: 700 × 2 = 1,400 points
Bonus Multiplier: 6×
Question Type: Fill in the Blank
Fill in the blank: To ______ means to pull toward, like a magnet and nails.
Correct Answer: attract
Bonus Score: 700 × 6 = 4,200 points
Bonus Multiplier: 5×
Question Type: True or False
Statement (True or False): Gravity pulls on the air as well as on us.
Correct Answer: True
Bonus Score: 800 × 5 = 4,000 points
Bonus Multiplier: 4×
Question Type: Fill in the Blank
Fill in the blank: When you jump in the playground, you always come back ______.
Correct Answer: down
Bonus Score: 800 × 4 = 3,200 points
Bonus Multiplier: 5×
Question Type: True or False
Statement (True or False): In orbit, astronauts appear to float because they and their spacecraft are falling around Earth together.
Correct Answer: True
Bonus Score: 800 × 5 = 4,000 points
Bonus Multiplier: 4×
Question Type: Matching
Match the items: Match each pair of forces with the resultant force.
1. 9 N right and 3 N left
2. 4 N right and 4 N left
3. 3 N right and 2 N right
a. 6 N right
b. 5 N right
c. 0 N, so no movement
Correct Answer: 1. 9 N right and 3 N left → a. 6 N right; 2. 4 N right and 4 N left → c. 0 N, so no movement; 3. 3 N right and 2 N right → b. 5 N right
Bonus Score: 800 × 4 = 3,200 points
Bonus Multiplier: 6×
Question Type: One-Word Answer
Question: A car stops when the brakes push opposite to the wheel force. Are the forces balanced or unbalanced?
Correct Answer: Balanced
Bonus Score: 800 × 6 = 4,800 points
Bonus Multiplier: 3×
Question Type: One-Word Answer
Question: Which friction is less than sliding friction: rolling or static?
Correct Answer: Rolling
Bonus Score: 800 × 3 = 2,400 points
Bonus Multiplier: 6×
Question Type: True or False
Statement (True or False): Sliding on a wet tile floor at school is safe.
Correct Answer: False
Bonus Score: 800 × 6 = 4,800 points
Bonus Multiplier: 4×
Question Type: One-Word Answer
Question: What word means 'the way something moves'?
Correct Answer: Direction
Bonus Score: 800 × 4 = 3,200 points
Bonus Multiplier: 3×
Question Type: Multiple Choice
Question: Why does Earth's gravity pull everything toward its center?
A. Earth is very large, so its pull is strong
B. Earth is very old
C. Earth is very smooth
D. Earth is very hot
Correct Answer: A. Earth is very large, so its pull is strong
Bonus Score: 900 × 3 = 2,700 points
Bonus Multiplier: 2×
Question Type: Multiple Choice
Question: Which example is NOT caused by gravity?
A. Rain falls from clouds
B. Leaves fall from a tree
C. Rubbing hands makes them warm
D. A ball comes back down
Correct Answer: C. Rubbing hands makes them warm
Bonus Score: 900 × 2 = 1,800 points
Bonus Multiplier: 4×
Question Type: Matching
Match the items: Match each clue with the correct word.
1. Moving forward fast while gravity pulls down, so it keeps circling
2. A weaker pull, so astronauts hop higher
3. Astronauts appear to float in orbit
a. Microgravity
b. Orbit
c. Moon's gravity
Correct Answer: 1. Moving forward fast while gravity pulls down, so it keeps circling → b. Orbit; 2. A weaker pull, so astronauts hop higher → c. Moon's gravity; 3. Astronauts appear to float in orbit → a. Microgravity
Bonus Score: 900 × 4 = 3,600 points
Bonus Multiplier: 5×
Question Type: Fill in the Blank
Fill in the blank: One child pushes 8 N to the right and another pushes 3 N to the left. The resultant force is ______ N to the right.
Correct Answer: 5
Bonus Score: 900 × 5 = 4,500 points
Bonus Multiplier: 4×
Question Type: Fill in the Blank
Fill in the blank: Two students push a box with 6 N from each side. The resultant force is ______ N.
Correct Answer: 0 (also accept: zero)
Bonus Score: 900 × 4 = 3,600 points
Bonus Multiplier: 6×
Question Type: Matching
Match the items: Match each clue with the kind of friction.
1. A heavy box does not move until you push harder
2. A parachute slows down in air
3. This friction is less than sliding friction
a. Fluid friction
b. Static friction
c. Rolling friction
Correct Answer: 1. A heavy box does not move until you push harder → b. Static friction; 2. A parachute slows down in air → a. Fluid friction; 3. This friction is less than sliding friction → c. Rolling friction
Bonus Score: 900 × 6 = 5,400 points
Bonus Multiplier: 3×
Question Type: One-Word Answer
Question: Which is easier to slide on: ice or sand?
Correct Answer: Ice
Bonus Score: 900 × 3 = 2,700 points
Bonus Multiplier: 3×
Question Type: True or False
Statement (True or False): Friction is a kind of resistance because it stops movement.
Correct Answer: True
Bonus Score: 900 × 3 = 2,700 points