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Physics: Chapter 8.2
Potential Energy and Conservation of Energy
| Question | Answer |
|---|---|
| If an object is losing height, what is the sign of gravities work on it and what is its potential energy doing? | Gravity does positive work and the object loses potential energy |
| What is the formula for work done by a conservative force? | W= -∆U |
| The SI unit of energy is _____ a)Watts b)Volts c)Joules d)Radians | c) joules |
| A spring has _____ potential energy when stretched or compressed. | more |
| What is the formula to calculate the potential energy? a) mg+h b) mgh c) mg-h d) mg/h | b) mgh |
| Which among the following can store the elastic potential energy? a) Wooden box b) Ground c) Spring d) Sky | c) Spring |
| A 5.0 kg mass is initially sitting on the floor when it is lifted onto a table 1.15 meters high at a constant speed. How much work will be done in lifting this mass onto the table? | 56.35 J |
| Suppose that you have a mass of 62.0 kg and that you walk to the top of a stairway which is h = 12.0 meters high and L= 15.0 meters deep. How much work will you have to do in walking to the top of the stairway? | 7291.2 J |
| A soccer ball of mass 0.65 kg is kicked from ground height. It travels up to a maximum height of 14 m before falling back to the ground. How much gravitational potential energy has the ball gained from leaving the ground until reaching max height? | 89.18 J |
| A 1000 kg car is resting at the top of a 43 m hill. Compared to the bottom of the hill, how much energy does the car currently have? What kind is it? | 421 400 J |
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