Physics Work, Energy, Power

Which of the following is defined as an energy transfer?

• kinetic energy

• work

• potential energy

• chemical energy

Tags

NGSS.MS-PS3-5

The unit of work is

• watt

• newton

• joule

• pascal

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.

• greater than

• equal to

• less than

• can't say unless we know how big the force is

Tags

NGSS.HS-PS2-1

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS3-5

NGSS.MS-PS2-2

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

• Faster at the bottom of the steeper hill

• Faster at the bottom of the less steep hill

• Same speed at the bottom of both hills

• Can’t say without knowing the mass of the marble

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

• 150 J

• 0

• Can’t tell without knowing the mass of the ball

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

• -18 J

• -10 J

• -8 J

• -2 J

Tags

NGSS.MS-PS3-5

What is the unit for power?

• Nm

• watt

• joule

• N/m²

In a Charpy test, the impact with the specimen __________ the hammer.

• adds energy to

• removes energy from

• does not affect the energy of

• absorbs all the energy of

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

Tags

NGSS.MS-PS3-4