H work and energy

Front

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

Back

KE and thermal energy increase, GPE decreases

Front

At which point will the cart's KE be greatest? Options: A, B, F, H

Back

F

Front

What will the total mechanical energy, E, of the skateboarder be when she reaches the bottom if she currently has E = 5000 J? Options: Greater than 5000 J, Less than 5000 J, 5000 J, 0 J

Back

5000 J

Front

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?

Back

10 J

Front

In which case is work NOT performed? Spider-Man is holding up a motionless 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

Back

Spider-Man is holding up a motionless car from falling

Front

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 the ball?

Back

4900 J

Front

A car with KE = 1000 J moving on a rough surface comes to a STOP over d = 5 m. What is the work done by friction on car?

Back

-1000 J

Front

Two students, W and X, push a box, each with different force, distance, and time. Which student had more POWER?

Back

W

Front

A car with KE = 1000 J moving on a rough surface comes to a STOP over d = 5 m. What is the amount of friction on the car?

Back

-200 N

Front

The cyclist is moving down a hill with a very rough surface. Which of the following describes the cyclist's energy conversion?

Back

KE and thermal energy increase, GPE decreases