Mechanical Energy: Conservation of Energy

What happens to energy as a weight swings?

• It disappears

• It transfers to another object

• It changes from one form to another

• It remains constant

What types of energy does a pendulum have as it swings back and forth?

• Only kinetic energy

• Only potential energy

• Both kinetic and potential energy

• Neither kinetic nor potential energy

What is the sum of the potential energy and the kinetic energy in a system called?

• Thermal energy

• Mechanical energy

• Chemical energy

• Electrical energy

When a basketball is tossed into the air, what happens to its kinetic and potential energy as it rises?

• Kinetic energy increases, potential energy decreases

• Kinetic energy decreases, potential energy increases

• Both kinetic and potential energy increase

• Both kinetic and potential energy decrease

All forms of energy are measured in what unit?

• Watts (W)

• Calories (cal)

• Joules (J)

• Newtons (N)

At which point does the ball have the most potential energy?

• When the ball is at the boy's hands

• When the ball is halfway down

• When the ball is at its highest point

• When the ball is just leaving the boy's hands

What happens to the ball's potential energy as it moves downward?

• It increases because the speed increases

• It decreases because its height decreases

• It remains constant

• It is converted into chemical energy

As the ball drops, what change occurs to its kinetic energy?

• It decreases

• It remains constant

• It increases

• It is converted into potential energy

When the ball reaches the boy's hands after falling, what can be said about its kinetic energy?

• It is at its lowest value

• It is at its highest value

• It is completely converted into potential energy

• It is the same as when the ball was at its highest point

What does the law of conservation of energy state?

• Energy can be created and destroyed.

• Energy is only transferred, not created or destroyed.

• Total energy decreases as potential energy increases.

• Kinetic energy is not part of total energy.