Combined Physics Archives - Page 6 of 11 - Study notes, tips, worksheets, exam papers

State the properties of magnets

8777 admin

30/10/2023 at 5:37 pm (last edited 30/10/2023 at 5:37 pm)

When a magnet is suspended freely, it will come to rest in a North-South orientation.
Unlike poles attract.
Like poles repel.
A magnet is strongest at its poles.

DC Motor

8387 admin

22/05/2023 at 12:35 pm (last edited 22/05/2023 at 12:35 pm)

Two Identical Metal Rods

8078 admin

05/04/2023 at 3:41 pm (last edited 03/05/2023 at 8:04 am)

How can energy be transferred from one energy store to another?

7964 admin

23/02/2023 at 3:11 pm (last edited 23/02/2023 at 3:13 pm)

Energy can be transferred from one store to another:

i) Mechanically (by a force acting over a distance)
Eg: a car moving up an inclined plane
(chemical potential energy –> gravitational potential energy)

ii) Electrically (by an electric current)
Eg: lighting up a bulb in an electric circuit
(chemical potential energy of battery –> light and heat energy of light bulb)

iii) By heating (due to a temperature difference)
Eg: a gas stove heating up a pot of water
(chemical potential energy of gas –> internal energy of water)

iv) By propagation of waves (both electromagnetic and mechanical)
Eg: a dipper producing surface water waves
(mechanical energy of dipper –> kinetic energy of water waves)

What is an energy store?

7959 admin

22/02/2023 at 4:28 pm (last edited 22/02/2023 at 4:28 pm)

An energy store is a substance or a physical system that can store energy in various forms.
Some examples of energy stores are:
– batteries (chemical potential energy)
– a stretched spring (elastic potential energy)
– fuels (chemical potential energy)
– a dammed water body (gravitational potential energy)
– tidal waves (kinetic energy)
– radioactive isotopes (nuclear energy)