Topic 1 Kinetic And potential energy stores

Question 1

What has kinetic energy

Answer 1

Anything that is moving has kinetic energy store. Energy is transferred to it when it speeds up and is transferred away when it slows down.
Kinetic energy store depends on the object mass and speed, the greater the mass and the faster it’s going the more energy there will be in the store

Question 2

Kinetic energy equation

Answer 2

Ek = 1/2mv^2

Ek = kinetic energy (j). m= mass (kg). V= speed (m/s)

Question 3

What has gravitational potential energy

Answer 3

Lifting an object in gravitational field requires work, this causes transfer of energy to the gravitational potential energy store.
The higher the object is lifted the more energy is transferred.
The amount of energy in the store depends on the height and strength of the gravitational field the object within.

Question 4

Gravitational potential equation

Answer 4

Ep = mgh
Ep = gravitational potential (j) m= mass(kg) G= gravitational field strength(N/kg). H= height (m)

Question 5

What energy do objects falling transfer

Answer 5

Energy from the gravitational potential energy store is transferred to the kinetic energy store.
For a falling object when there’s no resistance, energy lost from the G.P.E store = energy to kinetic energy store

Question 6

What has elastic potential energy

Answer 6

Stretching or squashing of object can transfer energy to its elastic potential energy store.
As long as the limit of proportionality has not been exceeded the equation can be used

Question 7

Elastic potential energy equation

Answer 7

So long as limit of proportionality isn’t exceeded
Ee = 1/2ke^2
Ee = elastic potential (j). K= spring constant (N/m). e= extension (m)

Question 8

Guess what

Answer 8

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Question 9

When will there be more kinetic energy

Answer 9

The greater the mass and the faster it is going

Question 10

When is the gravitational potential energy store higher

Answer 10

The higher the object is lifted

Question 11

When is the energy lost from the gpe store = energy gained in the kinetic energy store

Answer 11

When there is no air resistance

Question 12

What does air resistance acting against a falling object cause

Answer 12

Energy transferred to other store e.g thermal energy stores of object and surroundings