Physical Science Work, Power and Energy Lesson

Energy possessed by an object due to its position or Configuration.

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P.E.= mgh​ or P.E.= ½kx²

Potential Energy

Energy possessed by an object due to its motion.

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K.E.= ½mv²​

Kinetic Energy

Mechanical Energy

M.E.= K.E.+P.E. Unit of Energy is J

" Energy can neither be created nor be destroyed, can only be changed from one form to another . " 

Energy

​Work

Multiple Choice

Potential or kinetic?
Stretched bow and arrow?

• kinetic
• potential

Multiple Choice

How does conservation of energy explain why something that is falling should speed up?

• It gains kinetic energy because it gains potential energy.

• It loses kinetic energy because no work was done on it.

• It gains kinetic energy because it loses potential energy.

• It loses kinetic energy because the Earth gains potential energy.

​Work is also...

Multiple Select

Select all: Work is equal to...

• KE + PE

• Change in energy

• mg

• Fd

Multiple Choice

What is the unit of measurement for work?

• meters

• newtons

• m/s

• Joules

Multiple Choice

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

Multiple Choice

If you push a cart with a force of 60 N for 2 m, how much work have you done?

• 120 J
• 30 J
• 120 N 
• 30 N

Multiple Choice

Work of 2000 J is required to push an object 1.5 km. What is the force?

• 2.5 N
• 1.3 N
• 1.6 N
• 12 N

Multiple Choice

This weight lifter required 1029.7 newtons of force to bring the weights to a height of approximately 2.31 m in 9 seconds. How much power did he have?

• 264 Watts

• 1029 Watts

• 2,377 Watts

• 4,009 Watts