Vocabulary
Work and Power
Kinetic
Potential
FINAL JEOPARDY
100
This type of energy is referred to as stored energy

Potential Energy

100

A push or pull that causes motion

Work

100

What is the formula for Kinetic Energy?

KE=1/2mv2

100

What is the formula for potential energy?

PE=mgh

100
1. What is the potential energy of a 50 kg dog that is standing on a 5 m high deck?

PE=mgh

2. What is the kinetic energy of that same dog running with a speed of 4 m/s?

KE = 1/2mv2

3. What is the Total Mechanical Energy (TME) of the system?

TME = PE + KE

1. PE = mgh = (50)(9.8)(5) = 2450 J

2. KE = (1/2)mv2 = (1/2)(50)(4)2 = 400 J

3. TME = PE + KE = 2450 + 400 = 2850 J

200

This type of energy is referred to as the energy of an object in motion

Kinetic Energy

200

The amount of work done over time

Power

200

What is the kinetic energy of a car with a mass of 1000 kg moving at a speed of 25 m/s?

KE=1/2mv2

312500 J

200

What is the numerical value of gravity with units?

9.8 m/s2

300

This term says energy cannot be created or destroyed

Law of Conservation of Energy

300

What is the work done by a plane flying with a force of 5000 N over a distance of 100 m?

500000 J

300

What is the Kinetic Energy of a 90 kg person running at a speed of 3 m/s?

KE=1/2mv2

405 J

300

What is the Potential Energy of a 50 kg box sitting on a 15 m shelf?

7350 J

400

When energy is "lost" it is usually lost as this type of energy

Thermal Energy

400
Which has more power?


A biker pedaling with 200 J of work over 5 seconds

OR

A rollerblader skating with 225 J of work over 6 seconds

The biker (40 Watts)

400

What is the speed of a cat with a KE of 500 J and a mass of 20 kg?

KE=1/2mv2

7.07 m/s

400

A 80 kg person is standing on a roof with a potential energy of 50000 J.  How high is the roof?

63.7 m

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