Work and Power Calculations

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Presentation transcript:

Work and Power Calculations

Formulas you will need to use: 1. Force (F) = Mass (M) x Acceleration (A) 2. Work (W) = Force (F) x Distance (D) 3. Power (P) = Work (W) / Time (T) Unit of measurement of force is Newtons Unit of measurement of work is joules Unit of measurement of power is watts

1. Amy uses 20N of force to push a lawn mower 10 meters 1. Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?

2. How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N?

3. Shawn uses 45N of force to stop the cart 1 meter from running his foot over. How much work does he do?

4. How much work is done when a force of 33N pulls a wagon 13 meters?

5. You give a shopping cart a shove down the isle 5. You give a shopping cart a shove down the isle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2. How much force did you exert on the cart?

6. You push a friend sitting on a swing 6. You push a friend sitting on a swing. She has a mass of 50 kg and accelerates at a rate of 4 m/s2. Find the force you exerted.

7. How much force would it take to push another, larger friend who has a mass of 70 kg to accelerate at the same rate of 4 m/s2?

8. How much work is required to pull a sled 5 meters if you use 60N of force?

8. Liz does 4800. J of work in climbing a set of stairs 8. Liz does 4800. J of work in climbing a set of stairs. If she does the work in 6.00 seconds, what is her power output?

9. A person weighing 600 N gets on an elevator 9. A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was used? (first figure out how much work, then figure out the power)

10. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds 10. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used? (first figure out how much work, then figure out the power)