Energy Causes Change (G8U1L2)

Which of these is an example of the transformation of kinetic energy into gravitational potential energy?

• a person walking up a hill

• a person skiing down a hill

• a car racing around an oval track

• a person parachuting out of an airplane

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NGSS.MS-PS3-5

How is mechanical energy calculated?

• by adding potential energy and kinetic energy

• by dividing potential energy by kinetic energy

• by multiplying potential energy and kinetic energy

• by subtracting potential energy from kinetic energy

The diagram shows the curved path of a thrown ball.

At which point does the ball have the greatest amount of gravitational potential energy?

• point W

• point X

• point Y

• point Z

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NGSS.MS-PS2-4

NGSS.MS-PS3-2

Which of these has the most kinetic energy?

• a 25 kg fish tank sitting on a table

• a 50 g fish swimming in a fish tank

• a 7,500 kg car parked on a steep hill

• a 50 kg boulder suspended from a cliff

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

The diagram shows a swinging pendulum. During every swing, the pendulum’s speed and position change.

At which position would all of the pendulum’s potential energy have been transformed into kinetic energy?

• Position 1

• Position 2

• Position 3

• The potential and kinetic energies are equal in all positions.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which change would increase the kinetic energy of a moving object the most?

• reducing the mass by half

• reducing the speed by half

• doubling the mass of the object

• doubling the speed of the object

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of these events is an example of energy transfer?

• an open flame heating a pan of water

• a plant using sunlight to create glucose

• turning on a flashlight to create a beam of light

• a child rubbing her hands together to warm them

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NGSS.MS-PS3-3

NGSS.MS-PS3-4

How are work and energy different?

• Energy is the ability to do work, while work is the transfer of energy.

• Work can be created or destroyed, but energy cannot.

• Energy is always conserved, while work is not.

• Energy and work are the same concept.

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NGSS.MS-PS3-5

A 40 kg girl is pushing a 40 kg boy in a 20 kg toy wagon. The wagon is moving at a constant speed of 2.0 m/s.

Calculate the combined kinetic energy of the boy and the wagon.

• 80 J

• 120 J

• 160 J

• 200 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

A 40 kg girl and a 40 kg boy are both riding in a 20 kg toy wagon. They start moving downhill at a speed of 3.0 m/s.

Calculate the combined kinetic energy of the two children and the wagon.

• 100 J

• 150 J

• 300 J

• 450 J

Tags

NGSS.MS-PS3-1