Work and Power Calculations Formulas you will need
- Slides: 13
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 20 N 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 200 N?
3. Shawn uses 45 N 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 33 N pulls a wagon 13 meters?
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/s 2. How much force did you exert on the cart?
6. You push a friend sitting on a swing. She has a mass of 50 kg and accelerates at a rate of 4 m/s 2. 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/s 2?
8. How much work is required to pull a sled 5 meters if you use 60 N of force?
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. 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. What power was used? (first figure out how much work, then figure out the power)
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