# Physics

Forces and motionRepresenting motion, force, mass and acceleration, weight and friction, kinetic energy and momentumElectricityStatic electricity, circuits, resistance and resistors, mains electricityRadiationAtoms and isotopes, background radiation, nuclear fission and fusion

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## Representing motion

Distance-time graph

Slope on distance time graph represents speed.

• When object stationary graph is horizontal
• Steady speed= sloped but straight line.
• Steeper the line- greater speed
• Returning to start- downwards straight line.

Change in horizontal

• The gradient on DISTANCE- TIME graph represents speed.

Velocity time graph

Slope on velocity time graph represents acceleration

Distance Travelled= area under velocity time graph.

Velocity= speed with a given direction

• When object is moving at a constant velocity graph is horizontal
• Constant acceleration- sloped line
• Constant decceleration- sloped line downwards

The gradient of a line on a velocity-time graph represents the acceleration of the object. REMBEMBER ALWAYS m/s2

The area- area under the line in a velocity-time graph represents the distance travelled.

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