Kinetic Energy

A diver standing on top of a diving platform that is 20 meters above the pool dives off the platform. Describe the transfer of energy that occurs during the fall.

Answer explanation

As the diver falls from rest, there will be a decrease in potential energy and an increase in kinetic energy.

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The image below shows four soccer balls at different locations on an uneven soccer field. Which ball has the greatest amount of kinetic energy?

Answer explanation

Soccer Ball D

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The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2.

Answer explanation

At Position 2, the pendulum had 36.55 J of kinetic energy.

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Imagine a bird is diving into the ocean to eat a fish. At which point is the bird’s kinetic energy the greatest?

Answer explanation

at the moment of impact with the water

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Describe an instance when the motion energy of an object changed, causing some other energy change as well.

Answer explanation

When a driver slams on the brakes to make a quick stop, some of the motion energy is changed to thermal energy and sound energy.

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What two variables affect the amount of kinetic energy (KE) an object has?

Answer explanation

the mass of the object and speed

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Why do you think some states have different speed limits for 18-wheelers than passenger cars?

Answer explanation

because of the difference in mass. The 18-wheeler has much higher kinetic energy, so if it crashes, it will do much more damage.

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If someone were going to throw two different balls at your head at the same speed, what would you want to know about the two balls before you decide which ball would do the least amount of damage?

Answer explanation

I would want to know the mass of the balls.

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A student creates a ramp by stacking four blocks and then leaning a meter stick against it. She releases four different balls from the same position on the ramp and calculates their speeds. Based on the information in the table above, which ball would you predict to have the least kinetic energy when it reaches the end of the ramp?

• Golf ball

• Tennis ball

• Baseball

• Softball

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A graph showing the kinetic energy of a 10 kg object at different speeds is provided. Based on the information in the graph, we can predict that the kinetic energy of the object at 2 m/s would be–

• 12 Joules

• 20 Joules

• 38 Joules

• 44 Joules

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