Work, Energy, Power

What has to happen when a force is exerted on an object for work to be done?

• the object moves
• the object stays still
• the object is heavy
• none of these

What is kinetic energy?

• stored energy
• energy of motion
• energy of friction
• energy stored in chemical bonds

In order for positive work to be done, what must be true?

• Force acts in the same direction as the distance traveled.

• Force and distance are in opposite directions.

• Force is greater than distance.

• Distance is greater than force.

When you carry an object, is work done on it?

• Yes, force is applied in the same direction as the distance it travels.
• No, force is applied in a different direction than distance traveled.

What is being transferred as you do work?

• Energy
• Heat
• Power
• Gravitational Potential Energy

How do we calculate work?

• W = F * d

• w = m * D

• W = F * v

• w = m * f

How do we calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

The SI unit of work is?

• Joules
• Watts
• Newtons
• meters

What is the formula for Kinetic Energy?

• PE = m*g*h
• KE = 1/2m*v2
• W = F*d
• P = W/t

A 5000N block is lifted 10 m. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J