kinetic and potential energy stores

Question 1

What has kinetic energy stores and how is energy transferred to this store ?

Answer 1

anything that it moving has kinetic energy store and energy is transferred to this store when an object speeds up and is transferred away from this store when an object slows down.

Question 2

What does the energy in kinetic energy store depend on ?

Answer 2

1) objects mass and speed
2) greater mass and faster its going , the more energy in its kinetic energy store

Question 3

Formula for kinetic energy store

Answer 3

1/2 mv^2

m = mass (kg)
v^2 = speed (m/s^2)

Question 4

What causes gravitational potential energy ?

Answer 4

1) Lifting an object in a gravitational field requires work. This causes a transfer of energy to gravitational potential energy store of the raised object

Question 5

Higher the object is ———, the —– energy is transferred — this store

Answer 5

lifted, more, to

Question 6

Amount of energy in g.p.e store depends on ..
What is the equation for g.p.e

Answer 6

objects mass (kg), height (m) and strength of gravitational field ( N/Kg )

Ep = mgh

Question 7

When something falls, where is energy transferred ?

Answer 7

energy from gravitational potential energy store to its kinetic energy store.

Question 8

For falling object their is no air resistance

Answer 8

Energy lost from g.p.e = energy gained in kinetic energy store

In real life, all objects falling have air resistance acting against it which cause energy to be transferred to other energy stores. e.g. thermal energy store of surrounding

Question 9

How does energy transfer to elastic potential energy store

Answer 9

stretching or squishing an object as long as limit of proportionality is not exceeded

Question 10

equation for elastic potential energy

Answer 10

Ee = 1/2Ke^2

elastic potential = J
Spring constant = N/m
e^2 = extension (m^2)