Interim 2 Review

The acceleration of an object would increase if there was an increase in the:

• mass of the object.

• force on the object.

• inertia of the object.

• friction on the object.

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NGSS.MS-PS2-2

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• The box will not move.

• The box will slide toward Shane.

• The box will slide toward Susan.

• The box will be perpendicular to both Shane and Susan.

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You are holding a full bowl of hot soup while standing in the kitchen. As you begin moving, some of the soup spills out of the bowl onto the floor. Upon reflection, you realize that:

• the soup spilled because of air resistance.

• if you had traveled faster this wouldn't have happened.

• the soup wanted to stay where it was, but you moved the bowl.

• the soup and the bowl act as one body with the same velocity.

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The graph shows the acceleration of a racehorse taking off from a starting gate. By how much did the horse's speed increase between 4 seconds and 6 seconds?

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Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?

• A person doesn't exert a gravitational force.

• The two gravitational forces cancel each other out.

• The gravitational forces of people is so small it is overshadowed by that of Earth.

• There are so many people we are actually balanced by all the different gravitational forces.

Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

• 0

• 2

• 4

• 8

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A man has an air conditioner he wants to load into the back of his truck. Instead of lifting the air conditioner and carrying it to the truck, he improvises a ramp. He takes a board that is 3.6 meters long and places one end of it in the back of his truck, 1.2 meters off the ground. What is the mechanical advantage of the ramp?

• 2.5

• 3.0

• 4.32

• 4.8

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Which statement is TRUE about the picture above?

• The spheres have only weight but no mass.

• The 40 Newton sphere has the greatest gravitational force.

• The smaller the weight, the greater the gravitational force.

• Although the weights of the spheres are different, the gravitational forces are the same.

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NGSS.MS-PS2-4

This graph describes the motion of a skydiver that jumped from an airplane. The skydiver is MOST LIKELY:

• being influenced by equal amounts of gravity and air resistance.

• slowing down because of an unbalanced force of air resistance.

• accelerating because of an unbalanced force of gravity.

• on the ground and is not falling anymore.

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