Physics - created from Mind Map

Página 1

Forces and their effects

Kinetic energy

Electricity

Atoms and radiation

Life cycles of stars

Resultant forces

Gravitational potential energy and kinetic energy<br><br><ul><li>Gravitational Potential Energy and Kinetic Energy</li></ul>

Momentum

Terminal Velocity & Friction

Zero resultant force<br><br><ul><li>A stationary object remains stationary if the sum of the forces acting upon it - resultant force - is zero. A moving object with a zero resultant force keeps moving at the same speed and in the same direction.</li></ul>

Resultant force of more than zero<br><br><ul><li>If the resultant force acting on an object is not zero, a stationary object begins to accelerate in the same direction as the force. A moving object speeds up, slows down or changes direction.</li></ul>

a single force that has the same effect as all the forces acting on a object

Assume all GPE change to KE

Ep=mxgxh<br><br><ul><li>Ep=mxgxh

Joules=kgxn/kgxmeters</li></ul>

To do with movement of an object

If something is not moving the momentum is zero

The conservation of momentum

Collisions and explosions

Friction slows things down

Drag increases as speed increases

Terminal velocity

Objects falling through fluids reach terminal velocity

Steady speed

In falling objects it depends on

Shape

Area

Streamlined=will fall faster

Small area=less air resistance

Static Electricity

Circuits

Electrons move

Charges attract

Opposites repel

Electrons move away-positive charge

Symbols

A basic circuit is used to test components

Voltmeter

Ammeter

Potential Difference-Current Graphs

Measures potential difference in volts

Measures the current in amps

Atom Structure

Radiation

Plum Pudding

Rutherford

Atoms are solid

Firing beams of alpha particles at gold foil