Raising an auto in a service station requires work. Raising it twice as high requires

• half as much work
• the same work
• twice the work
• four times the work

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

NGSS.MS-PS3-2

Raising an auto in a service station requires work. Raising it in half the time requires

• half the power
• the same power.
• twice the power
• four times the power

Tags

NGSS.HS-PS3-2

The energy due to the position of something or the energy due to motion is called

• potential energy
• kinetic energy
• mechanical energy
• conservation of energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4

After you place a book on a high shelf, we say the book has increased

• elastic potential energy.
• chemical energy
• kinetic energy.
• gravitational potential energy

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

An empty truck traveling at 10 km/h has kinetic energy. How much kinetic energy does it have when it is loaded so its mass is twice, and its speed is increased to twice?

• the same KE
• twice the KE
• four times the KE
• more than four times the KE

Tags

NGSS.HS-PS3-2

Which of the following equations is most useful for solving a problem that asks for the distance a fast-moving crate slides across a factory floor in coming to a stop?

• F = ma
• Ft = ∆mv
• KE = 1/2mv2
• a. Fd = ∆1/2mv2

Tags

NGSS.HS-PS3-1

A boulder at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. It rolls off the cliff. When it is halfway to the ground its kinetic energy is

• the same as its potential energy at that point
• negligible
• about 60 MJ
• more than 60 MJ

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

In an ideal pulley system, a woman lifts a 100-N crate by pulling a rope downward with a force of 25 N. For every 1-meter length of rope she pulls downward, the crate rises

• 25 centimeters
• 45 centimeters
• 50 centimeters
• 100 centimeters

Tags

NGSS.MS-PS2-2

When 100 J are put into a device that puts out 40 J, the efficiency of the device is

• 40%.
• 50%.
• 60%.
• 140%.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-3

An energy supply is needed for the operation of a(n)

• automobile
• living cell
• machine
• all of these

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3