Calculating Energy

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

• 10 J

• 100 J

• 7 J

• 20 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What is the kinetic energy at position Y? (ignore friction)

• 0J

• 10,000J

• 20,000J

• can not be determined

Tags

NGSS.MS-PS3-1

A golf pro swings his driver with a mass of 0.75 kg at a velocity of 60 m/s. What is the kinetic energy of the club?

• 22.5 J

• It doesn't have kinetic energy-it has potential energy.

• 2,700 J

• 1,350 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

Determine the potential energy of a 5 N book that is moved to three different shelves on a bookcase. The height of each shelf is 1 m, 1.5 m, and 2.0 m.

• 5 J, 7.5 J 10 J

• 5 J, 3.3 J, 2.5 J

• 2.5 J, 5.625 J, 10 J

Tags

NGSS.MS-PS3-2

A baby carriage sitting at the top of a hill is at a height of 21 m high. The carriage with the baby weighs 12 N. What kind of energy does the carriage have and how much?

• potential energy and 1.75 J

• potential energy and 252 J

• kinetic energy and 252 J

• kinetic energy and 1.75 J

Tags

NGSS.MS-PS3-2

A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. What is the KE of the car?

• 22,400 J

• 44,800 J

• 896,000 J

• 1,792,000 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

Which of the following has the GREATEST IMPACT on the kinetic energy of an object and why?

• Mass because very small and very large things can't have the same kinetic energy.

• Velocity because its value is squared.

• Height because it can be a very large number.

• The acceleration due to gravity because it is acceleration which is more than velocity.

Tags

NGSS.MS-PS3-1

An 2 kg apple is hanging in a tree, 10 ft off the ground. What is the gravitational potential energy (gravity = 9.8 m/s²) of the apple?

• 960.4 J

• 98 J

• 1920.8 J

• 196 J

Tags

NGSS.MS-PS3-2

A skydiver jumps from a plane and is halfway through her descent. At this point in time she has:

• Kinetic Energy

• Gravitational Potential Energy

• Both Kinetic and Gravitational Potential Energy

• She has no energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Which of the following has the greatest amount of gravitational potential energy (gravity = 9.8 m/s²)?

• A 20 kg projector suspended 10 m in the air

• A 100 kg wrecking ball suspended 10 m in the air

• A 5 kg basketball suspended 10 m in the air

• They all have the same GPE because they are all 10 m in the air

Tags

NGSS.MS-PS3-2