AP Physics Energy

You 80kg and your date 65kg decide to go to the park. The two of you decide to see who can get the highest on the swings. At the bottom of your swing you are 1m above the ground and are traveling 5m/s. How high is your peak in the swing?

• 2.28m

• 1.28m

• 1m

• 9.8m

Tags

NGSS.HS-PS3-1

Energy is ....

• Weird

• Destroyed during explosions

• Conserved

• Created under the right circumstances

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The space shuttle (RIP) used to be transported to its launch pad by a large mobile platform. If the platform holds up the space shuttle 4.5x10⁶kg while rolling 800m to the launch pad, how much work does it do in holding up the shuttle?

• More than 0 but less than 1x10⁵ J

• More than 1x10⁵J but less than 1x10⁷J

• More than 1x10⁷ J but less than 1x10⁹ J

• More than 1x10⁹ J

• 0 J

What unit do we use for measuring power?

• Watts 

• Joules 

• Newtons 

• ft/lbs

Ian and Steve ski down the 75 m slope in 80 seconds using 400 N of penguin force. Calculate their penguin power!

• 375 W

• 37.5 W

• 426.7 W

• 240 000W

Tags

NGSS.HS-PS2-1

How are work and energy related?

• The work done by an external force acting on an object causes a change in the mechanical energy of the object.

• Work is the same thing as energy. They are equal.

• Energy is mgh, and work is mv²/2

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.HS-PS2-1

Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?

• 0.5 m

• 2 m

• 4 m

• 10 m

Tags

NGSS.HS-PS3-1

Bowling Ball A is dropped from a point halfway up a cliff. A second identical bowling ball, B, is dropped

simultaneously from the top of the cliff. Comparing the bowling balls at the instant they reach the ground,

which of the following are correct? Neglect air resistance.

• Ball A has half the kinetic energy and takes half the time to hit the ground as Ball B.

• Ball A has half the kinetic energy and takes one-fourth the time to hit the ground as Ball B.

• Ball A has half the final velocity and takes half the time to hit the ground as Ball B.

• Ball A has one-fourth the final velocity and takes one-fourth the time to hit the ground as Ball B.

• None of these are correct.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A net force (Fcosθ) acts on an object moving in the

positive x-direction along the axis over a distance of 4

meters, depicted in the graph at right. Find the work done by the force in the interval from 0.0 to 2.0 m.

• 0 J

• 3 J

• 3/cosθ J

• 6 J

Tags

NGSS.HS-PS2-1