HMH Unit 1 Lesson 2 - Energy Causes Change

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

• 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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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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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 sitting on the edge of a cliff

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The diagram shows a swinging pendulum. During every swing, the pendulum’s speed and position change. Three positions during the swing are identified as Position 1, Position 2, and Position 3.

At which point would most 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.

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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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Which of these statements 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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What is energy?

• it's an emotion

• the capacity of an object to do the work

• ability to supply force and a change in distance to an object

• a light chicken gravy

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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.

• 60j

• 240j

• 120j

• 4j

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A pickup truck drives to Home Depot at 20mph to get some dirt. The dirt is dumped into the back which DOUBLES the truck's mass.

The truck leaves at the same speed of 20mph. What happens to it's kinetic energy?

• Since the mass doubled, the energy is doubled

• since the mass doubled the energy exponentially increased.

• the energy remained the same

• the energy was less

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