P2 - Work, energy and power Flashcards
What is the equation for work done (energy)? [1]
Work done = Force x Distance
What are the units for work? [1]
Joules (J)
What type of energy is stored in a moving object? [1]
Kinetic energy
What happens, in terms of energy, when an object is lifted? [1]
It’s gravitational potential energy increases
What is the equation for kinetic energy? [1]
KE = 0.5mv²
What is the equation for gravitational potential energy? [1]
GPE = mgh
Name 8 energy stores [8]
Kinetic, gravitational potential, chemical, elastic potential, nuclear, thermal, light, sound
Describe ways that energy can be transferred [4]
Forces (mechanical), Electric currents (electrical working), heating, waves
What is the law of the conservation of energy [1]
Energy cannot be created or destroyed
When work is done against friction or resistance for a moving object, what happens? [1]
There is less of a change in kinetic energy because some energy is dissipated through heating
What is the definition for power? [1]
The rate at which work is transferred
What is the equation for power? [1]
Power = change in energy / time
What are the SI units for power? [1]
Watts (W)
Describe the difference between renewable and non-renewable sources of energy [1]
Renewable energy is collected from resources that will never run out
Name 4 non-renewable energy resources [4]
Coal, oil, gas, nuclear
