Remediation Blog 3

Class IX

Subject Science (Physics)

Chapter Work and Energy

Link:
Worksheet for Practice:
1. Jenny uses 20 N of force to push a lawn mower 10 meters. How much work does she do?

2. Joe balances a stationary coin on the tip of his finger 20 cm from the top of the table. How much work is Joe doing?

3. Frank does 2400 J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his power output?

4. How much power is required to pull a sled if you use 60 J of work in 5 seconds?

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

6. If it takes 5 seconds for you to do 1000 J of work, what is your power output?

7. A 900 N mountain climber scales a 100 m cliff. How much work is done by the mountain climber?

8. A small motor does 4000 J of work in 20 seconds. What is the power of the motor in watts?

9. A woman runs a kilo meter using a force of 210 N and a power output of 500 W. How long in minutes does it take this woman to complete 1 kilo meter?

10. A model glider has a mass of 1 kg. How much potential energy does it have 2 meters off the ground?