Physics autum term

Question 1

What does “Conservation of Energy” mean?

Answer 1

Total energy out=total energy in/energy can’t be destroyed or created only transferred and stored

Question 2

Explain that where there are energy transfers
in a closed system there is no net change to the total
energy in that system

Answer 2

Energy transfers can occur in closed systems.
However, since energy cannot exchange with the surroundings,

Question 3

Analyse the changes involved in the way
energy is stored when a system changes, including:
a) an object projected upwards or up a slope

Answer 3

The object’s energy is slowly transferred from the kinetic store to the gravitational potential store as it slows down and climbs higher.

Question 4

Explain, using examples, how in all system
changes energy is dissipated so that it is stored in
less useful ways

Answer 4

Electrical cables warming up are a good example of this

Question 5

Explain how efficiency can be increased

Answer 5

Devices can be made more efficient by reducing the energy that they waste or dissipate to the surroundings.