work and energy

What kind(s) of energy does the person have at c)?

• GPE & KE
• GPE, KE, and EPE
• EPE only
• KE & EPE

The cart moves down a ramp with a lot of friction. Which of the following describes the cart's energy conversion?

• GPE, KE, and thermal energy all increase
• KE and thermal energy increase, GPE decreases
• GPE, KE, and thermal energy all decrease
• Each of GPE, KE, and thermal energy remains unchanged

At which point will the cart's KE be greatest?

• A
• B
• F
• H

The skateboarder at this point has E = 5000 J. What will her total mechanical energy, E, be when she reaches the bottom?

• Greater than 5000 J
• Less than 5000 J
• 5000 J
• 0 J

The skier has total mechanical energy E = 16000 J. In midair, the skier's KE = 6000 J. What is her GPE in midair?

• 16000 J
• 6000 J
• 10000 J
• 22000 J

Top of hill: KE = 100 J, GPE = 150 J. Bottom: KE = ?

• 50 J
• 100 J
• 150 J
• 250 J

The ball starts at h = 3 m with GPE = 30 J. What is the GPE of the ball once it is 1 m off the ground?

• 30 J
• 20 J
• 10 J
• 0 J

In which case is work NOT performed?

• Spider-Man holds up a car from falling
• Iron Man moves a mini arc reactor into his chest
• The Hulk punches a tank across the desert
• Captain America hurls his shield at the Red Skull

The SAME cart on each track starts at rest from the SAME height. Which cart will have greater speed at the bottom?

• A
• B
• They have the same speed
• Need to know the value of mass

At rest, a 2 kg ball is shot out of a cannon and has GPE = 4900 J at top. What is the work done by the cannon on ball?

• 9800 J
• 4900 J
• 2450 J
• Need value of height