BRAINCAKEMotion
Revision notes for Motion in AQA Physics (7407). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Speed and VelocityScalar and Vector Quantities scalar vector distance displacement speed velocity Speed is a scalar quantity.
- Average Speed and Instantaneous SpeedMotion at Constant Speed in a Straight Line speed = distance time Average Speed Average speed = total distance total time Instantaneous Speed…
- Distance-time GraphsA distance-time graph shows how far an object has travelled as time passes.
- Displacement-time GraphsA displacement-time graph shows the position of an object relative to its starting point as time passes.
- Uniform AccelerationAcceleration is the change in velocity per unit time.
- Non-uniform AccelerationAcceleration is the rate of change of velocity, a = Δv/Δt.
- Constant Acceleration FormulaeFinal velocity = initial velocity + additional velocity due to acceleration v = u + a t so v2 = u2 + 2as displacement = average velocity × time. s =…
- Inclined Plane TestGalileo timed a ball as it rolled down a plank.
- Acceleration Due to GravityThe acceleration of free fall is the acceleration due to gravity g = 9.81ms-2 near the Earth's surface.
- Practical: Measuring gYou can measure g by using an electronic timer and motion sensor or the apparatus shown below A ball is released from rest from an electromagnet.
- Distance-Time vs Displacement-Time GraphsPlotting both graphs for the same motion shows the difference between distance and displacement.
- Speed-time vs Velocity-time GraphsA velocity-time graph shows direction as well as speed, so velocities in the opposite direction are plotted below the time axis.
- ProjectilesA projectile is any object acted upon only by the force of gravity.
- Vertical ProjectionVertical Motion is motion under gravity.
- Horizontal ProjectionHorizontal Motion follows Newton's Ist Law.
- Projectile MotionIf a ball is thrown at angle θ, vertically, the projectile undergoes free fall under gravity.
- The Effect of Air ResistanceAir resistance is a drag force caused by friction between layers of air near the projectile's surface The horizontal component reduces the…
On the specification
- 3.4.1.3 Motion along a straight line
- 3.4.1.4 Projectile motion