Potential and Kinetic Energy Mid-Point Review

A graph showing the kinetic energy and speed of a moving object is provided. Which of the following can be concluded from the graph?

• Kinetic energy increases as speed increases.

• All moving objects have the same kinetic energy.

• Speed is only related to the size of an object.

• Kinetic energy only changes when speed changes.

A graph showing the kinetic energy and mass of objects traveling at 10 m/s is shown. In order for an object moving at 10 m/s to have a kinetic energy of 1800 Joules, the object must have a mass in the range of–

• 0-10 kg

• 10-20 kg

• 20-30 kg

• 30-40 kg

Students conduct an experiment using a toy car with the mass of 10g, a toy car with the mass of 20g, and a toy car with the mass of 30g. The students want to test the cars on a ramp and measure how far the cars traveled. Evaluate the information and determine the question they are trying to test with this experiment.

• Does the amount of incline determine how far the car will travel?

• Does the mass of the object influence the amount of potential energy?

• Does the height of the ramp influence the amount of potential energy?

• Does the mass of the car influence the amount of kinetic energy?

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 J

• 20 J

• 38 J

• 44 J

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?

• softball

• baseball

• tennis ball

• golf ball

At which position on the diagram would an apple have the greatest potential energy?

• 1

• 2

• 3

• 4

Two magnets rest on a table. Because like poles of a magnet repel each other, the magnets exert a force on each other. If Magnet 1 is moved closer to Magnet 2, Magnet 2 will move. This is because–

• magnets can only exert a force on other magnets.

• forces can affect objects over a distance.

• moving Magnet 1 changed the force needed to move Magnet 2.

• objects need to touch each other in order to cause movement.

Choose the answer that has the most ELASTIC POTENTIAL energy:

• a rubber band laying on a table

• a rubber band pulled back only part of the way

• a rubber band pulled back all the way

• gravity at 9.8 m/s2

An illustration of a roller-coaster is provided. At which point in the roller-coaster’s journey along the track does it have the greatest potential energy?

• Z

• Y

• X

• W

Magnetic charges are very similar to electrostatic charges. Two balloons are given an electrostatic charge by rubbing them with a wool cloth. Which observation provides evidence of the force that the balloons exert on each other over a distance because of their charge?

• Both Balloon 1 and Balloon 2 are pulled downward by the force of gravity.

• Moving Balloon 1 can make Balloon 2 move without the balloons touching.

• The amount of rubbing with the wool cloth can change the amount of charge.

• The charge on the balloons gets weaker over time until there is no charge.