Conservation of Energy

What kind(s) of energy is(are) in a person climbing a ladder?

• Potential

• Kinetic

• Both

• Need the mass of the person to determine.

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?

• The PE and KE increase and decrease together

• The PE decreases while the KE increases

• Impossible to know without knowing the mass

• The PE and the KE decrease and increase together.

When velocity triples, kinetic energy increases by ______ times. KE =1/2mv²

• 9

• 3

• 1.5

• 4.5

If a 0.5 kg ball is thrown up with 250 J of kinetic energy, how high will it go?

(HINT: At the ball's highest point it has stopped.)

KE = 1/2mv² , PE = mgh

g = 9.8 m/s²

• 51 m

• 25.5 m

• 12.76 m

• 31.6 m

The skateboarder shown above has a potential energy of 2,800 J and kinetic energy of 0J at a height of 4 meters. How much total mechanical energy will she have after 2 seconds? Neglect friction and air resistance.

• 2000J

• 1600J

• 1400J

• 2800J

A skydiver jumps out of a helicopter. What is happening in terms of energy?

• He is gaining potential energy as he falls, and losing kinetic energy.

• He is gaining kinetic energy as he falls and losing potential energy.

• His kinetic and potential energy is always the same.

• He is gaining kinetic and potential energy at the same time.

What is the KE at point B?

• 14 J

• 12 J

• 6 J

• 8 J

What is the GPE at point E?

• 14 J

• 12 J

• 6 J

• 8 J

Where is the car moving fastest?

• A

• B

• C

• D

What is the Total Energy at the top?

• 15,000 J

• 3,750 J

• 7,500 J

• 11,250 J