Energy, Power, Work

Unit of kinetic energy is the ....

• Watt

• Newton

• Joule

• Nm

Tags

NGSS.HS-PS3-2

Which of these are examples of mechanical energy?

• Uk

• Us

• Ug

• Uf

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

NGSS.HS-PS3-3

A spring is compressed vertically and used to fire a ball bearing straight up. What is the energy transformation at the instant the ball starts to move?

• Ug to Us

• Ug to Uk

• Us to Ug

• Us to Uk

Tags

NGSS.HS-PS3-3

A spring is compressed vertically and used to fire a ball bearing straight up. What is the energy transformation at the top of the arc?

• Uk to Ug

• Ug to Uk

• Us to Ug

• Us to Uk

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A spring with a k value of 22.5 N/m is compressed 3.25 cm to fire a 100 g steel ball straight up. What is the velocity as it leaves?

• 7.31 m/s

• 2.70 m/s

• .488 m/s

• .238 m/s

Tags

NGSS.HS-PS2-1

A motor raises a 50.0 kg mass 8.5 m in 16.0 s. What is the velocity of the mass?

• .425 m/s

• 6.88 m/s

• 1.85 m/s

• .531 m/s

A motor raises a 50.0 kg mass 8.5 m in 16.0 s. What is the power for this motor?

• 266 W

• 312 W

• 185 W

• .531 W

Tags

NGSS.HS-PS3-1

A 2.5 kg block is at rest on a table with signicant friction. The coefficient of friction is .38. Let g = 10 m/s/s. What is the minimum force to move the block?

• 65.8 N

• 25.0 N

• 9.5 N

• 4.25 N

Tags

NGSS.HS-PS2-1

A 2.5 kg block is at rest on a table with signicant friction. The coefficient of friction is .38. Let g = 10 m/s/s. If a F of 42 N is applied, what is the net F?

• 17 N

• 32.5 N

• 9.5 N

• 4.25 N

Tags

NGSS.HS-PS2-1

A motor with a 120 W rating is used to raise a 6.5 kg mass 17.5 m. How long does it take?

• there is not enough information

• 10.5s

• 68.6 s

• 32.1 s

Tags

NGSS.HS-PS2-1