Unit 8 - Forces and Motion

Which of the following objects will have the greatest change in motion?

• A small force is applied to an object with a large mass.

• A small force is applied to an object with a small mass.

• A large force is applied to an object with a large mass.

• A large force is applied to an object with a small mass.

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Mr. Dobie threw a ball into the air and watched it go up for a long time. Then it started to fall back toward him. What force caused the ball to return to the ground?

• friction

• gravity

• motion

• wind

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Arrows represent the forces applied to an object. A longer arrow means a greater force. Which object will move upward?

• 
• 
• 
• 

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Two boys are about to use the same force to push a parent and a child. Which describes what will happen?

• The parent will swing higher.

• The parent will accelerate faster.

• The child will accelerate faster.

• The parent and the child will accelerate at the same rate.

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Tori tests how far three identical toy cars travel under three different conditions. Which reasoning explains how Tori is controlling variables?

• The mass and force change for each trial.

• Neither the mass nor force change for each trial.

• The mass changes for each trial, but the force does not change.

• The force changes for each trial, but the mass does not change.

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Stefan pushes a cart with three books so it just reaches the end of a track. Next, he puts six books onto the cart. Which claim explains what he must do so that the cart reaches the end of the track?

• use less force

• use more force

• use the same amount of force

• use a different cart

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Alonso uses a stretched rubber band to propel a toy car across a flat surface. What force makes the car roll forward?

• a push from the air

• the pull of gravity

• a push from Alonso’s hand

• a push from the rubber band

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Four forces are acting on the block in the picture.

Which claim describes conditions that will cause the block to begin to move?

• F_g is less than F.

• F_f is less than F.

• F_n and F_g are equal.

• F_g is greater than F_f.

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Jeremy pulled the spring scale in the picture.

How could he decrease the force needed?

• Pull harder on the spring scale.

• Add more weights on the block.

• Place sandpaper under the block.

• Place waxed paper under the block.

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Denelle pulled gently on a spring scale. The scale showed a force, but the block did not move. Why not?

• The force that she applied was balanced by another force.

• The string between the spring scale and the block was not strong enough.

• The spring scale was broken, so there was no force when she pulled on it.

• There was not enough friction for the block to move.

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