Physics Paper 1- Major Focus Of Exam Flashcards
What is kinetic energy?
Energy stored in moving objects
Do stationary objects have kinetic energy?
No
What’s the equation to calculate kinetic energy?
1/2 mass x velocity squared
What are the energy changes taking place in a car travelling at constant speed?
Chemical energy in petrol- kinetic energy store
What type of energy is a stretched spring storing?
Elastic potential energy
What is the force directly proportional to?
The extension of a spring
When the graph of force vs extension, when the graph no longer has a constant gradient, what do we call it!
The limit of proptionalott
What’s the equation for elastic potential energy?
1/2 x spring constant x extension
What’s the unit for spring constant?
N/m
What’s the unit for extension?
Metres
What is gravitational potential energy?
Energy stores in an object due to its position above the earths surface
What are the energy transfers when I lift a tennis ball from the ground to a shelf?
Chemical store in my muscles- GPE store of the ball
What’s the equation for GPE?
Mass x g x height
What’s the unit for gravitational field strength?
N/kg
What’s the unit for mass?
Kg
What is the specific heat capacity of a substance?
Energy needed to raise the temperature of 1kg of the substance by 1 degree
What’s the equation for specific what capacity?
Energy/mass x change in temp
What’s the unit for specific heat capacity?
J/kgoC
What is thermal energy?
Energy stored due to an objects temperature
What is the law of conservation of energy?
Energy can be transferred usefully, stored or dissipated but cannot be created or destroyed
In a closed system, can energy enter or leave?
No
On a pendulum, when the mass swings from a fixed point, what are the energy transfers?
GPE- KE-GPE
Why is there maximum kinetic energy at the bottom of the pendulum?
Because that’s when it is travelling the fastest
What’s a problem with energy transfer in a pendulum ?
Haven’t considered friction