Physical Science Practice Exam

Which one is balanced?

• top

• bottom

• both

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What happens to the speed of the wagon as the rain collects inside of it?

• it decreases

• it remains constant

• it increases

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Most modern vehicles have padded dashboards. This reduces collision injuries by...

• reducing the driver's change in momentum

• increasing the driver's change in momentum

• increasing the force of impact

• increasing the time of impact

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What happens when two objects collide?

• Energy is changed into force.

• Energy is transferred from one object to another.

• Energy is created and the objects move faster.

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What effects the amount of energy transferred in a collision?

• the speed

• the weight

• the speed AND weight

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As mass increases, KE ...

• increases

• decreases

• stays the same

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What type of simple machine is shown here?

• Pulley

• Wheel and Axle

• Lever

• Wedge

The ______________ is a flat surface that is raised so one end is higher than the other.

• inclined plane

• lever

• pulley

• wedge

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NGSS.MS-PS2-4

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

• 0.5

• 2

• 3

• 6

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Which situation is work not done?

• lifting a 20 pound box off the floor

• holding a 20 pound box above the floor

• sliding a 20 pound box across the floor

• sliding a 20 pound box up an inclined plane