Science Chapter 13- Forces and Motion

Which of these objects has periodic motion?

• a car

• a pendulum

• a sea star

• the Earth

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A train travels 140 miles west in 2 hours. What is the velocity of the train?

• 70 miles per hour/west

• 280 miles per hour

• 280 miles per hour/west

• 70 miles per hour

How do electricity and magnetism act on different objects?

• They can either push or pull objects only if they touch.

• They can either push or pull objects.

• They can only push objects.

• They can only pull objects.

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Machine A performs 48 joules of work in 4 seconds. Machine B performs the same amount of work in half the time. Which statement is true about Machine A and B?

• Machine B used more power than Machine A.

• Machine A used more power than Machine B.

• Machine A and Machine B used no power.

• Machine A and Machine B used the same amount of power.

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What needs to occur for the box to move to the right?

• Sam needs to push the box with more force than Ling.

• Sam and Ling need to pull on the box with equal amounts of force.

• Sam and Ling need to push the box with equal amounts of force.

• Ling needs to push the box with more force than Sam.

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A truck hits an insect. What effect does the insect have on the truck?

• The insect hits the truck with less force than the force with which the truck hits the insect.

• The insect hits the truck with more force than the force with which the truck hits the insect.

• The insect hits the truck and the truck hits the insect with the same amount of force.

• The insect has no effect on the truck.

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Which force keeps a satellite in orbit?

• gravity

• fraction

• electricity

• magnetism

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Which complex machine uses MAINLY human force to operate the simple machines in it?

• car

• ship

• go cart

• bicycle

How is the driver using a simple machine?

• The driver is using a third-class lever to steer the car.

• The driver is using a pulley and lever to steer the car.

• The driver is using a wheel and axle to reduce the amount of force needed to steer the car.

• The driver is using a wheel and axle to reduce the amount of work needed to steer the car.

When you ride a roller coaster, what makes your body rise out of its seat at the top of a hill?

• intertia

• gravity

• friction

• electricity

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