Objective: Explain and calculate the mechanical advantages of machines in various scenarios. When needed,
remember labels for your answers!
1. Work is the amount of force it takes to move an object over a distance. For work to be done, a transfer
of energy must take place. What is the formula for work? What is the unit for work? (2pts)
2. What is mechanical advantage? How do we find the mechanical advantage of a machine? (2pts)
3. How much work is being done by a green penguin pushing a pink
piano with a force of 45N up a ramp that is 9m long? Don’t forget a
unit for your answer! (2pts)
4. Aneesa lifts a crate into the back of her truck. She exerts a force of 200N with a distance of 1.2m.
Calculate the amount of work done on the crate. Don’t forget a unit for your answer! (2pts)
5. Aneesa then used an inclined plane to push the same
crate into the truck. She exerts a force of 77.5N with a
distance of 3.1m. What is the work done on the crate?
Don’t forget a unit for your answer! (2pts)
6. In which situation, questions 4 or 5, was more work done? (1pt)
7. Explain how the inclined plane made it easier for Aneesa to lift the load, but required more work.
8. A clown is trying to lift a refrigerator of wigs a height of 2 meters. It would take him a force of 80
Newtons to lift the fridge without a simple machine.
a. How much work would be required to lift this
fridge of wigs without a machine? Don’t forget
a unit for your answer! (2pts)
b. Assuming no friction, how much effort force would be required to lift the fridge of wigs with a
lever that has a mechanical advantage of 4? Don’t forget a unit for your answer! (2pts)