Physics <3 Flashcards
What store of energy increases as an object is raised from the ground?
Gravitational Potential energy.
What is the energy store associated with movement?
Kinetic energy.
What is the law of the conservation energy
Energy cannot be created or destroyed. It can transferred between stores.
what does each finger represent in Flemings left hand rule?
Thumb : Force
Index finger : magnetic field
Middle finger : Current
What is Magnetic field?
A region of space where a magnetic object will feel a force.
How can you alter the speed of a motor?
Change the magnitude of the current, the number of turns in the coil, or strength of the permanent magnet.
What is the store of energy in fuels, foods and batteries?
Chemical energy.
How much energy is transferred each second if the power is 1W?
1 Joule per second.
What does the strength of a magnetic field around a current carrying wire dependent on?
The magnitude of the current in the wire and the distance away from the wire.
What does the magnetic field strength of an electromagnet depend upon?
It depends upon the current, the number of turns on the coil and the material in the coil.
What is the store of energy which increases if the temperature of the object increases?
Thermal energy.
What are 4 ways energy can be transferred between stores?
1 - Mechanically, 2 - Electrically, 3 - Heating by particles, 4 - Waves.
In which direction do magnetic field lines go?
Away from the North Pole and towards the South.
What store of energy is increased when an object is stretched or squashed?
Elastic Potential Energy.
