Work, Power and Energy

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

The energy of movement is...? 

• Kinetic
• Potential

Energy that is stored is called...

• Kinetic
• Potential 

The SI unit for power is...?

• Watts
• Joules
• Newtons
• Meters

A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

• 0 J

• 39000 J

• 20800 J

• 2600 J

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 
• It measures how much effort is applied over a certain distance
• It measures the change in an object's rate of speed
• It measures how much time it takes to move a massive object

What does one newton exerted over a distance of one meter equal?

• One watt
• One hertz
• One volt 
• One joule 

Two factors that determine work are

• size of the force, and distance
• size of the force, and type of force
• mass, and distance

True or false
You do work only when you exert a force on an object and move it

• true
• false

P=25 watts 
W=5000 Joules 
t=???

• 200 sec
• 0.0005 s
• 125000 s
• 125 s