BRAINCAKE

Forces and Motion

OCR AS-level PhysicsTopic 2 of 817 lessons

Revision notes for Forces and Motion in OCR Physics A (H156). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.

  1. Average SpeedThe average speed of an object is calculated from the total distance travelled and the total time taken.
  2. Displacement and VelocityBoth displacement and velocity are vector quantities.
  3. Displacement on a Velocity-time GraphThe displacement of an object is given by the area under its velocity-time graph.
  4. AccelerationAcceleration is the rate of change of velocity.
  5. Equations of Motion - Uniform AccelerationAcceleration is the rate of change of velocity.
  6. Free Fall Under GravityAll masses exert equal and opposite gravitational forces on each other.
  7. Projectile MotionA projectile is an object upon which the only force is gravity.
  8. Car Stopping DistancesThe stopping distance of a car is the distance travelled from when the driver first sees a reason to stop to when the vehicle stops. stopping…
  9. Weight, Mass, AccelerationThe mass of an object depends on how much matter it contains.
  10. Centre of MassAn object's gravitational force (its weight) acts through a point called its centre of gravity.
  11. Free-Body Force DiagramsA free-body force diagram isolates all the forces acting on an object.
  12. Drag and Terminal VelocityAn object moving through a fluid (e.g. air or water) experiences a resistive drag force from the fluid.
  13. Moments and EquilibriumAn object in equilibrium has no net force acting on it and no net moment (rotational equilibrium).
  14. Couples and TorquesA couple is a pair of forces that are parallel but act along different lines.
  15. Forces in EquilibriumIf an object on which forces are acting is held at rest then the resultant of these forces must be zero.
  16. Density and PressureThe density of a substance is its mass per unit volume.
  17. Pressure in Fluids and Archimedes PrincipleGases and Liquids (fluids) exert pressure on surfaces because of the constant collisions of their molecules with the surfaces.

All OCR AS-level Physics topics