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Power is the rate of work done. [True/false]
True
You're curling dumbells. You transfer 110 J of energy (work done) in 2 seconds. What is your power?
55 W [ power = work done / time ]
You're on the squat rack. You transfer 1500 J of energy (work done) in 2 seconds. What is your power?
750W [ Power = work done / time ]
A crane lifts a 1000N payload 25m upwards. How much "work" has the crane done?
25,000 J Work done = force x distance.
A cyclist uses their brakes. What are you calculating if you times the friction force by the distance covered whilst braking?
Work done / energy transferred [Work done = force x distance]
How do you calculate the amount of "work done" when doing a deadlift?
Work done (J) = Force (N) x distance (m)
What is "work done"?
The energy transferred by a force.
A laptop transfers electrical energy to light, sound and thermal. Which type of energy is considered wasted?
Thermal
A toaster transfers electrical to thermal and light. Which type of energy is considered wasted?
Light
By what process does heat energy move through a vacuum?
Radiation
By What process does heat energy move through a gas or liquid?
Convection
By what process does heat energy move through a solid?
Conduction
Burning fossil fuels releases sulfur oxides into the atmosphere. What negative environmental effect can sulfur oxides cause?
Acid rain
What gas is a product of burning fossil fuels, that contributes to the greenhouse effect?
Carbon Dioxide CO2
What source of energy is non renewable, but not a fossil fuel?
Nuclear (Uranium 235)
Name 3 sources of renewable energy
wind, solar, wave, tidal, geothermal, gravitational potential energy
Name three sources of energy which are fossil fuels
Oil, Coal and Natural Gas
What type of energy is transferred around a circuit?
Electrical
What is the force used by the brakes of a bike, to transfer kinetic energy into thermal energy?
Friction.
A cars brakes transfer the kinetic energy of a moving car into what type of energy?
Thermal
A TV transfers electrical energy in to what 3 types of energy?
Light, Sound and thermal
Energy from the sun is transferred to earth as what type of energy?
Light
When you burn coal, the chemical energy is transferred as what type of energy?
Thermal + Light
What type of energy is stored in fuels such as coal?
Chemical energy
What type of energy is store in the nucleus of an atom?
Nuclear energy
What type of energy is stored in a sandwich?
Chemical Energy
What type of energy is store in a battery?
Chemical Energy
An elastic band with a spring constant of 1.2 J/m is stretch 14 cm. How much elastic potential energy does it store?
0.01J
A pen with mass 100g sits on a desk 1m above the ground. How much gravitational potential energy is the pen storing? g = 9.8 N/kg
0.98 J
A bungee jumper with mass 71 kg stands at the top of a bridge 42 m high. How much gravitational potential energy is the jumper storing? g = 9.8 N/kg
29224 J
A roller coaster car with mass 55 kg is 23 m above the ground. How much gravitational energy is it storing? g = 9.8 N/kg
12397 J
A horse of mass 102 kg is running at a velocity of 3.9 m/s. How much kinetic energy is the horse storing?
776 J
A runner of mass 55 kg is travelling with a velocity of 1.3 m/s. how much kinetic energy is the runner storing?
46 J
A Bike and rider of mass 65 kg is travelling with a velocity of 2.3 m/s. How much kinetic energy is the biker and rider storing?
172 J
A roller coaster has 2500J of gravitational energy at the top of a loop. (assuming there is no friction) How much Kinetic energy does it have on the ground at the bottom of the loop?
2500J
When a tennis ball is drop it transfers gravitational potential energy into which type of energy?
Kinetic
Friction is a force which transfers energy in what form?
Thermal (heat) energy
What is the unit of energy
Joules (J)
What is the equation to calculate elastic potential energy?
E = 1/2 k e2
What is the equation to calculate Kinetic energy?
Ek = 1/2 M v2
Can energy be created?
No, only stored or transferred
What is the name of the energy store when objects are up high?
Gravitational potential energy
What is the name of the movement energy store?
Kinetic energy
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