Science Forces

Which of these can happen when force is put on an object? (3-PS2-1)

• a. The object can turn.
• b. The object can speed up.
• c. The object can slow down.
• d. All of the above.

What is friction? (3-PS2-2)

• a. how fast something moves
• b. the direction in which an object moves
• c. how something is put into motion
• d. the force that holds back or stops the movement of an object

Rocio and Kevin investigated how a push can affect the motion of a still book. The table shows how far the book moved. What conclusion can you make from their data? (3-PS2-1)

• a. When the force is stronger, the book moves farther.
• b. When the book is pushed to the right, it moves to the right.
• c. When the force is weaker, the book's position stays the same.
• d. When two forces push on the book with equal strength, its motion stays the same.

Which of these is an example of putting force on an object? (3-PS2-1)

• a. hitting a baseball with a bat
• b. typing on a keyboard
• c. pushing dirt with a bulldozer
• d. all of the above

Imagine you are pushing a large box across the floor. Which type of floor would result in the most amount of friction between the floor and the box? (3-PS2-2)

• a. Wood
• b. Ice
• c. Thick carpet
• d. Tile

What will happen if you bring the north pole of one magnet toward the south pole of another magnet? (3-PS2-3)

• a. The magnets will become stronger.
• b. The magnets will lose their magnetic forces.
• c. The magnets will push apart.
• d. The magnets will pull together.

Which of the following are true about friction? Check all that apply. (3-PS2-2)

• a. Friction is a force.
• b. Two objects or surfaces must be in contact for friction to act.
• c. Friction pulls objects towards the center of the Earth.
• d. The amount of friction depends on the weight of objects and the type of surface.

Which of the following are non-contact forces? Check all that apply. (3-PS2-3)

• a. A magnet attracting a paper clip
• b. Earth's gravity pulling an apple from a tree
• c. Friction between a box and the ground
• d. Two people pulling on a rope

Which of the following is true of all magnets? (3-PS2-3)

• a. All magnets have strong magnetic force.
• b. All magnets always pull instead of push.
• c. All magnets have a north pole and a south pole.
• d. All magnets are doughnut-shaped.