Energy and Conservation

Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass
• Friction and movement
• Mass and Movement
• Height and Friction 

What is mechanical energy?

• It is what metal creates when heated.
• All potential and kinetic energy in a system.
• It is motion of all matter.
• Energy of momentum.

What does kinetic energy depend on?

• The weight and volume of an object
• The buoyancy of an object
• The mass and speed of an object
• The furriness of an object

An object is speeding up when: (Choose All That Apply)

• it is gaining kinetic energy.

• it is losing kinetic energy.

• it is gaining gravitational potential energy.

• it is losing gravitational potential energy.

Calculate the PE of a 2 kg cat perched 10 meters above the ground. 

• 20 J
• 200 J
• 2.04 J
• 200 W

Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg who is moving at 4 m/s.

• 200 J
• 800 J
• 400 J
• 100 J

Explain what happens to the potential energy of a rock as it falls off the side of a cliff.

• The kinetic energy decreases as the potential energy increases.
• The kinetic energy decreases as the potential energy decreases.
• The potential energy decreases as the kinetic energy increases.
• The potential energy decreases as the kinetic energy decreases. 

If a pendulum has 20 J of potential energy at point 1, how much kinetic energy will it have a point 3?

• 0 J

• 10 J

• 20 J

• 30 J

If a pendulum has 30 J of kinetic energy at point 3, how much potential energy will it have a point 3?

• 0 J

• 10 J

• 20 J

• 30 J

In diagram 2, if the mass of the car is 600 kg, what is the change in potential energy from point A to point B?

• 411,600 J

• 294,000

• 176,400 J

• 117,600 J