TEST Physics: Work, Energy & Power

what is the unit of work?

• Newton

• Joule

• Watt

• meter

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

A student lifts 100 N of books 1 m to his shoulder. He walks forward 10 m to the stairs and goes up 3 m. He walks 20 m forwards to class. How much work has been done to the books?

• No work is done

• 100J

• 300J

• 400J

What is the common formula for work?

• W=F v cos (angle between the direction of motion and the force)

• W=F d cos (angle between the direction of motion and the force)

• W=F m cos (angle between the direction of motion and the force)

• W=F t cos (angle between the direction of motion and the force)

Big H jumps over a fence to get a football. He uses 2000J of energy, and a force of 100N. How high was the fence?

• 2m

• 20m

• 0.2m

• 3m

A boy drop a ball from height. Ignoring the effect of air resistance, the total energy is...

• greatest at point 1

• Greatest at the point 2

• Greatest at the point 3

• The same at all three points

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

• 10 m

• 0.1 m

• 25,000 m

• 10 J

Newtons are the unit for _____________.

• Work

• Distance

• Acceleration

• Force

You exert 200 J of work by pulling on an object with 20 N of force. What distance is the object moved?

• .01 m

• 10 m

• 10 J

• 4,000 m

_____________ is the rate of doing work.

• Conservation of energy

• Joules

• Energy

• Power