HMH Unit 8 Lessons 1-3 Quiz

Four forces are acting on the block below. 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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Tori tests how far three identical toy cars travel under three different conditions. Which reasoning explains how Tori is controlling variables? (Hint: look on top of the cars)

• 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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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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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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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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Raoul 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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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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Ryan asked the question “Does the number of coils in a spring affect how far it will launch a ball?” How can Ryan improve the experiment he designed to answer his question?

• by repeating each measurement

• by adding uncontrolled variables

• by trusting his opinions

• by changing data that doesn’t fit

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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 groups performed an investigation. The first group’s results are below.

Trial Force (N)

1 4.5

2 4.8

3 4.6

If the second group used the same equipment and procedure, which results are they most likely to get?

• 1.8 N, 3.4 N, 4.5 N

• 3.6 N, 4.7 N, 6.9 N

• 4.6 N, 4.4 N, 4.7 N

• 4.9 N, 5.6 N, 5.4 N

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