Energy (Activity 3)

A demonstration helps students understand a principle of roller coaster design.

Which answer choice correctly describes the ball's kinetic and potential energy?

• The ball has more potential energy at position X than at position Z.

• The ball has more kinetic energy at position Y than at position W.

• The potential energy and kinetic energy of the ball are equal to position X.

• The potential energy and kinetic energy of the ball are greatest at position Z.

A marble is given potential energy by being placed at Location W. When the marble is released, it rolls down the track.

At which location does the marble have maximum kinetic energy?

• Location W

• Location X

• Location Y

• Location Z

A bicycle rider is traveling up a hill. When the rider reaches the top of the hill, she stops to rest. Then she travels down the hill. The diagram shows the rider in the three different positions.

Which of these correctly describes the potential energy and the kinetic energy of the bicycle rider?

• When the rider is at the top of the hill, her potential energy is the greatest, and her kinetic energy is the least.

• As the rider moves up the hill, her kinetic energy increases, and her potential energy decreases.

• When the rider goes down the hill, her potential energy increases, and her kinetic energy decreases.

• As the rider reaches the bottom of the hill, her kinetic energy and her potential energy decreases.

The drawing shows two identical airplanes at an air show. The airplanes are flying at the same speed. Airplane W is flying 50 m higher than Airplane X.

Which statement best describes the energy of the two airplanes?

• Airplane W has a greater kinetic energy than Airplane X.

• The two airplanes have the same gravitational potential energy but different kinetic energies.

• Airplane X has more gravitational potential energy than Airplane W.

• The two airplanes have the same kinetic energy but different gravitational potential energies.

A student drew the diagram below to show the movement of water through a hydroelectric dam.

The student used the diagram to describe changes in the potential and kinetic energy of the water. At which location is the gravitational potential energy of the water the greatest?

• Location W

• Location X

• Location Y

• Location Z

Four students were asked to classify the activities of the people in the picture as examples of either potential or kinetic energy.

Which student correctly classified the activities?

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In the classroom demonstration shown, a rubber ball is dropped from Position 1. The ball bounces as shown.

At which position does the ball have both the greatest kinetic energy and the least potential energy?

• Position 1

• Position 2

• Position 3

• Position 4

The distance a toy car travels is shown in the graph.

Which table best shows the average speed of the toy car at different time intervals?

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A block is pulled 0.90 m to the right in 2.5 s.

What is the block's average speed to the nearest hundredth of a m/s?

A student kicks a soccer ball three times. Another student records the distance, the amount of time the ball travels, and the average speed in the table shown below.

How many seconds did it take for the ball to travel 30 m during Kick 3?

• 0.5 s

• 1.0 s

• 1.5 s

• 2.0 s