SOL PS 10 Practice Test

The ramp on the back of a moving van is an example of what type of simple machine?

• pulley

• wedge

• wheel and axle

• inclined plane

A device that uses a combination of two or more simple machines is called a—

• complex machine

• compound device

• double machine

• compound machine

The diagram illustrates a 2nd class lever. Which action would make it a 1st class lever?

• moving the fulcrum to the far left end of the beam

• placing the fulcrum on top of the beam

• moving the fulcrum to the center of the beam

• removing the fulcrum

A car manufacturer reduces the mass of a car by 250 kg. If the new design is

otherwise identical to the old design, how will the new car compare to the old car?

• It will need less force to move.

• It will require more fuel to operate.

• It will have a greater gravitational attraction to the road.

• It will release more gas emissions.

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Which is the result of using a more powerful motor to run an elevator?

• The same amount of work is done in less time.

• Less work is done in the same amount of time.

• The same amount of time is needed to move the same distance.

• A longer time is needed to move a shorter distance.

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To complete a project, 200,000 Joules of work are needed. The time taken to

complete the project is 20 seconds. How much power is needed (in Joules per second)?

P = W/t

• 200,020 J/s

• 10,000 J/s

• 0.0001 J/s

• 1,000,000 J/s

A girl kicks a soccer ball into the air. Which of these best explains why the soccer ball

falls back to Earth?

• The acceleration of the ball is unstable.

• The motion of the ball is changed by external forces.

• The pressure on the ball changes with altitude.

• The force exerted on the ball is greater than gravity.

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According to the chart, on which planet would a ball fall the fastest?

• Earth

• Jupiter

• Neptune

• Saturn

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What is the velocity of a dancer moving 7 meters towards the left side of the stage over the course of 20 seconds?

Velocity = d/t (with direction)

• 0.35 m/s left

• 140 m/s left

• 0.35 m/s right

• 0.35 left

When a pulley is added to a pulley system, what happens to the amount of force needed to move the object?

• The force needed to move the object remains the same.

• The force needed to move the object decreases.

• The force needed to move the object increases.

• None of these answers is correct.