18939355
GCSE Edexcel Physics - Motion and Forces
- A scalar has a magnitude but no direction
- A vector has a magnitude and a direction
- Velocity is speed in a stated direction
- Speed = distance / time
- On a distance time graph, the gradient is the speed
- Acceleration = change in velocity / time
- On a velocity time graph, the gradient is acceleration
- On a velocity time graph, the area under the graph is the distance
- Acceleration in free fall is 10ms^-2 due to gravity
- Newtons first law - where the resultant force is 0, the object will remain stationary / at a constant velocity
- Newton's second law - Force = mass x acceleration
- Weight = mass x gravity
- Weight can be measured using a newton meter
- The higher the weight of a body, the higher it's gravitational field strength
- An object moving in a circular motion has a constant speed but a changing velocity as it changes direction
- For circular motion there must be a centripetal force towards the centre of the circle
- Walking - 1.4m/s
- Running - 3m/s
- Cycling - 5.5 m/s
- Cars (built up) - 13m/s
- Cars (motorway) - 31m/s
- Planes - 250m/s
- Trains - 55m/s
- Wind - 5-20m/s
- Sound in air - 340m/s
- Ferries - 15m/s
- Weight is the force acting on an object due to gravity
- 1) Record the mass of the trolley, unit masses and hanging hook
- 2) Mark a line on the ramp before the first light gate so the
trolley moves the same distance
- 3) Attach the trolley to the hanging mass and let go of it at the
start line
- 4) Each light gate records the time that the trolley passes
through and the speed of it at that time
- 5) Acceleration can be calculated by using the initial speed (1st
gate), final speed (last gate) and the time taken to move
between them
Media attachments
Want to create your own Mind Maps for free with GoConqr? Learn more.