9T1 9U3 9U4 Mrs Walsham Energy calcs revision

Hi everyone,

You all have the Energy Calculations test next week:
9T1 Tuesday 17th December period 2
9U3 Thursday 19th December period 6
9U4 Wednesday 18th December period 3

As well as using seneca to revise Kinetic energy, Gravitational energy, Work done and Power equations, you can also answer the questions below ↓↓

Any problems, please come and find me in C13. 😊

1)    What is the equation that links force, distance moved and work done?

2)    What is the equation that links gravitational field strength, gravitational potential energy, change in height and mass?

3)    What is the equation that links mass, kinetic energy and velocity?

4)    What is the equation that links the spring constant, elastic potential energy and extension?

5)    What is the equation to calculate efficiency?

6)    What is the equation that links time, power and work done?

7)    A ball is moving with a velocity of 5m/s. Its mass is 0.2kg. Calculate the kinetic energy.

8)    Why does a lorry travelling at 20m/s have more kinetic energy than a car travelling at the same speed?

9)     A spring of spring constant = 2N/m is stretched 3 meters. What is its elastic potential energy store?

10) A cable car of mass 4,500kg is suspended 120m above the Earth’s surface. Find the gravitational potential energy store of the cable car. Assume g = 9.8 N/kg.

11) Find the power of a lift that transfers 486J of energy in 36 seconds.

12) A car burns 400J of chemical energy. If 350J of kinetic energy store are produced, find the amount of wasted energy.

13) A power station uses 1900J of fuel and produces 1250J of electricity. Calculate the efficiency of the power station.

14) A loudspeaker uses 400W of power and produces 325W of sound, wasting 75W in thermal energy. Find the efficiency of the loudspeaker.

15) What is the power of an engine that does 9700J of work in 11 seconds?

16) What will happen to the gravitational potential energy store if you double the height of an object?

17) If the extension of a trampoline spring is 0.3m, and its spring constant is 1.8 N/m, how much elastic potential energy store does it store?

18) A car of mass 78950kg has a velocity of 287m/s. What is its kinetic energy?

19) Why does a train waiting at a station have no kinetic energy?

20) A car brakes with a force of 5000N, it travels 30m before it stops. How much work was done?