AQA Physics Revision - Forces And Motion

Detailed notes on Forces and Motion from textbook

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Motion
Speed (m/s) = Distance (m) / Time (s) - (Time = Speed / Distance) or
(Distance = Speed x Time)
Distance-time graphs:
Vertical Axis = Distance traveled
Horizontal Axis = Time
Line on graph horizontal = Stationary
Sloped, straight line = Steady speed
Steeper the line = Greater the speed of the object
Velocity-time graphs:
Vertical axis = Velocity
Horizontal axis = Time
Line on graph horizontal = Constant velocity
Sloped, straight line = Constant acceleration
Steeper the line = Greater the acceleration of the object
Area under the line = Distance
Acceleration = Change in velocity / Time
Kinetic Energy
Unit of work is measured in Joules/J.
Resultant force = 0 = stays constant (stationary/moving)
Resultant force > 0 = constant goes in direction of resultant / moving
changes to direction of the resultant force (speeds up, slows down or
changes direction)
Doubling size of the force = doubling the acceleration
Doubling the mass = halves the acceleration
Resultant force (N) = mass (kg) x acceleration (m/s) ­ Mass = Force /
Acceleration - Acceleration = force / mass

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Weight and friction
Weight (N) = mass (kg) x gravitational field strength (N/kg)
Falling = Accelerate downwards ­ no air resistance down - RF = down/ Speed gained
= weight stays the same by air resistance increases ­ RF = down (still) / air
resistance = weight ­ reaches a steady speed = TERMINAL VELOCITY
Car stopping distances affected in different ways
Thinking distance changes due to:
Alcohol
Drugs
Tiredness
Braking distances changes due to:
Worn brakes or tires
Poor weather conditions (wet or icy)…read more

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