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100
What is gravity?
the force of attraction between objects with mass
100
Ty drops a feather and a bowling ball from a high tower. If there were NO AIR RESISTANCE, what would you expect to happen?
1. They would hit the ground at the same time.
2. The feather will would hit the ground first.
3. There is no way to predict what would happen.
4. The bowling ball would hit the ground first.
1. They would hit the ground at the same time.
100
Which of the following is true of every force?
*It pulls to stop an object from moving.
*It pushes or pulls on an object.
*It is underneath an object.
*It lies on top of an object.
It pushes or pulls on an object.
100
Which of the following has the strongest gravitational pull?
1. a bowling ball
2. Earth
3. the sun
4. a car
3. the sun
100
Jenny is jumping up in the air. What happens at the highest point of her jump?
1. Gravity starts to pull her back down.
2. Gravity becomes weaker.
3. The force of her jump becomes greater than gravity.
4.The force of her jump pulls her back down.
1. Gravity starts to pull her back down.
200
Imagine there was no gravity.
Would people feel light or heavy?
Is it easy or hard to stand?
People would feel so heavy it would be hard to stand up.
200
Saturn has more gravitational pull than Earth. On Saturn, a feather will __________.
1. fall to the ground more quickly than on Earth
2. never reach the ground
3. fall to the ground more slowly than on Earth
4. reach the ground in the same amount of time as it would on Earth
fall to the ground more quickly than on Earth
200
Which of the following animals would feel the strongest gravitational pull?
Dinosaur
200
What natural phenomenon occurs on Earth due to the gravitational force of the moon?
1. earthquake2
2. ocean tides
3. volcanos
4. hurricanes
Ocean Tides
200
Gravity on Earth pulls all things __________.
1. toward the sky
2. toward the center of Earth
3. toward Earth’s atmosphere
4. toward the center of the moon
2. toward the center of Earth
300
Why does the sun exert a stronger gravitational pull on Earth than the moon does?
1. because the sun is closest to Earth
2. because the sun is smaller than Earth
3. because the sun is so bright and hot
4. because the sun has more mass than any object in the solar system
4. because the sun has more mass than any object in the solar system
300
Which activity is made easier by the force of gravity?
a. climbing a large rock
b. riding a bike downhill
c. swimming across a pool
d. jumping rope
b. riding a bike downhill
300
Which two forces are acting on a falling object?
1. gravity and velocity
2. gravity and air resistance
3. free fall and friction
4. gravity and free fall
2. gravity and air resistance
300
What do we call the force of gravity on an object?
weight
300
Jeannie put her soccer ball on the ground on the side of a hill. What force acted on the soccer ball to make it roll down the hill?
gravity
400
Jupiter has more mass than any other planet in our solar system. Mercury has less mass than any other planet. Which planet has the most gravity?
Jupiter
400
Sometimes, we say that gravity pulls an object “down.” Which diagram represents the direction of this pull?
b.
400
In which case is gravity the main force acting to move an object?
1. when a soccer ball rolls along a flat floor
2. when an orange falls from a tree
3. when you push a cart along the floor
4. when you kick a ball
2. when an orange falls from a tree
400
When will gravity be the strongest?
1. the farther away you are from an object
2. always the same
3.the closer you are to an object
4. the faster your relative speed is to an object
3. the closer you are to an object
400
If our sun were twice as massive as it is, how might Earth’s movement around the sun be affected?
1. Earth would crash into the sun.
2. The path would not change.
3. Earth would float away.
4. The path would be a straight line.
1. Earth would crash into the sun.
500
Catherine is studying the force of gravity in her science class. Which of the following is NOT a way for Catherine to observe the force of gravity?
1. Observe baking soda react with vinegar.
2. Drop a ball and watch it fall to the ground.
3. Jump up and down on a trampoline.
4. Watch raindrops fall during a rain shower.
1. Observe baking soda react with vinegar.
500
The circle in the picture below represents Earth. The arrows show the direction of the gravitational force.
Which objects have their gravitational force correctly diagramed?
objects A and B
500
Why do satellites launched from Earth need to reach a certain speed to reach outer space?
1. to avoid Earth’s magnetic field
2. to protect equipment from radiation
3. to overcome Earth’s gravitational force
4. to break through the sound barrier
to overcome Earth’s gravitational force
500
How much gravity an object has depends on its __________.
mass
500
What is the force that pulls the parachute down toward Earth?
gravity