Physics

• Speed

  Distance / Time
• Velocity = displacement / time
• Free fall - an object falling under the influence of gravity alone.
• Average speed = initial speed + final speed / 2
• Average speed (m/s)

  Distance / Time
• Rate of change of speed (m/s^2)

  Final speed - Initial speed / Time taken
• Average velocity (m/s)

  (Initial velocity + Final velocity) / 2
• Acceleration (m/s^2)

  Final velocity - Initial velocity / Time taken
• Retardation

  Negative acceleration
• Vector


  • Quantity that depends on direction
• Scalar


  • Quantity that doesn't depend on direction
• Area under speed-time graph = Distance
• Area under velocity-time graph = Displacement
• Gradient of speed-time graph = Rate of change of speed
• Gradient of velocity-time graph = Acceleration
• Constant gradient of speed-time + velocity graph = Constant acceleration
• a force is a push or pull that acts on a object , measured in ((N)Newtons)
• The effects of force can be seen through shape, size, direction
• The leftover force is the resultant force
• In absence of unbalanced forces an object will continue to move at a constant speed, or remain at rest
• Mass = amount of matter in an object
• Weight = force exerted on a object due to their mass and pull of gravity
• Force = mass x acceleration
• Weight = mass x gravitational field strength
• All bodies in the absence of air resistant fall at the small rate 10m/s^2 on earth
• force(N) = spring constant(N/cm) x extension(cm)
• Pressure = force / area
• Moments = force x perpendicular distance from pivot
• When a body is in equilibrium the sum of clockwise moments equals the sum of anticlockwise moments about the same point
• Density = mass / volume