FORCE - contact/at a distance
2. What do all in contact forces have in common?
A. They use magnets.
B. The objects must touch.
C. They happen outdoors.
D. They use gravity.
B. The objects must touch.
A student rolls a ball into another ball. The second ball begins to move. Did the first ball push or pull the second ball?
push
Students roll balls down the same ramp to investigate how ball mass affects how far a cup moves. What should they change?
A. The color of the cup
B. The mass of the ball
C. The location of the classroom
D. The color of the ramp
B. The mass of the ball
You need to measure 30 milliliters of water. Which tool should you use?
Graduated cylinder.
Write the THREE objects a magnet will most likely attract.
Iron nail — Plastic spoon — Steel paper clip — Rubber eraser — Steel screw
Iron nail, steel paper clip, steel screw
17. Which statement is TRUE?
A. Gravity is an in contact force.
B. Magnets must touch to work.
C. In contact forces happen when objects touch.
D. At a distance forces require touching.
C. In contact forces happen when objects touch.
A student pushes a toy car gently. Then the student repeats the test with a stronger push. Everything else stays the same. Which push will most likely make the car travel farther?
The stronger push
Students release a washer on a string from different heights. Which starting position will most likely make the washer hit a block with the greatest force?
A. A low starting position
B. A middle starting position
C. The highest starting position
C. The highest starting position
You want to measure the mass and length of a rock. Which TWO tools should you use?
Pan balance and ruler
Two magnets have their north poles facing each other. Will they pull together (attract) or push apart (repel)?
Push apart (repel)
1. Which action is an example of an in contact force?
A. Gravity pulling a ball down
B. A magnet attracting a paper clip
C. A student pushing a desk
D. Earth pulling on the Moon
C. A student pushing a desk
Students release a weight on a string from different heights. Which starting position will most likely make the washer hit a block with the greatest force?
A. A low starting position
B. A middle starting position
C. The highest starting position
C. The highest starting position
A toy car is rolling to the right. A student gives it another push to the right. What will most likely happen to its speed?
It will most likely speed up.
What change happens to an ice cube when heat is added?
It melts, changing from a solid to a liquid.
The north pole of one magnet faces the south pole of another magnet. Will they attract or repel?
attract
3. Which force acts at a distance?
A. Kicking a ball
B. Pulling a wagon
C. Sliding a book
D. Gravity
D. Gravity
A student drops a ball. Which force pulls the ball toward the ground?
A. Magnetism
B. Gravity
C. A push from the air
D. A pull from the student
B. Gravity
Students use different pushes on the same wagon. Each trial begins at the same place on the same surface.
Trial Distance the wagon moves
A. 25 centimeters
B. 60 centimeters
C. 10 centimeters
D. 45 centimeters
Which trial most likely used the least force?
Trial C
An ice cube is heated until it melts. Then the water is heated until it changes into water vapor. Write the states of matter in order.
_______________ → _______________ → _______________
Solid → liquid → gas.
A magnet attracts an iron nail. Is the magnetic force on the nail a push or a pull? Explain.
Pull, because the nail moves toward the magnet.
4. Which situation shows a force acting at a distance?
A. A student pushes a chair.
B. A magnet attracts a nail.
C. A person pulls a rope.
D. A player kicks a soccer ball.
B. A magnet attracts a nail.
A student tosses a beanbag into the air, and it falls back to the ground. Does gravity need to touch the beanbag to pull it down? Explain.
No. Gravity is a force that acts at a distance.
Two students want to move a cart to the left. One stands on each side of the cart. Describe how one student could pull and the other could push to help move it left.
The student on the left pulls left while the student on the right pushes left.
Students are building a sandcastle, but the dry sand keeps falling apart. What could they mix with the sand to help it stick together?
water
Two identical iron nails are different distances from a magnet. The closer nail moves toward the magnet, but the farther nail does not. Explain why.
Magnetic force becomes weaker with distance. The farther nail is too far away for this magnet to pull it toward the magnet.