Work, Energy and Power

Which of the following objects has the most kinetic energy?

• A 20 kg toddler running at 5 m/s
• A 50 kg toddler running at  30 m/s
• A 90 kg toddler running at 30 m/s
• A 100 kg  toddler running at 2 m/s

Tags

NGSS.MS-PS3-1

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?

• Potential Energy
• Kinetic Energy
• Nuclear Energy
• Chemical Energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which position has the most kinetic energy?

• A
• G
• D
• B

Tags

NGSS.HS-PS3-2

Which position has the most potential energy?

• A
• G
• C
• D

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Mr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4,000 N. Mr. P's class pulled to the left with a force of 5,000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?

• 4100 J
• 3100 J
• 5100 J
• 8100 J

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A pendulum is released from point C.  Which statement is correct as it  swings from C to A?

• The PE increases and KE decreases
• The KE increases and PE decreases.
• The PE is maximum at A.
• The KE is maximum at C and B.

Tags

NGSS.HS-PS3-2

How much work is done carrying a 10-N box horizontally across a floor for 8 m?

• 80 J
• 10 J
• 8 J
• 0 J

You do work against gravity when you walk up some stairs.

• True

• False

Tags

NGSS.HS-PS2-4

You do work when you glide (not pushing) across the ice while ice skating.

• True

• False

Tags

NGSS.HS-PS3-2

A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?

• 2000 Joules
• 19,600 Joules
• 19,600 m/s
• 31.3 m/s