Physics GCSE Forces

Resultant forces
1. The forces acting on an object can change how it moves
2. If the forces on one side of an object are bigger than the other side then the resultant force is towards the smaller side because that is the direction of the force.
3. 1. You can see that the resultant force is towards the smaller force.
4. If the resultant force is zero it means the object may be stationary or at a constant speed.
Motion
1. The accelration of an object can be calculated if you know the mass and resulting force acting on it.
2. The equation A = F / M
  1. F is the resulting force in newtons N
  2. A is the acceleration in M/S squared.
  3. M is the mass of the object in KG
Forces and Energy
1. Work
  1. Work is done when a force causes an object to move through a distance.
  2. The equation: W = F x D
    1. W is the work done in joules.
    2. F is the force acting on the object in N
    3. D is the distance moved by the object while the force is acting.
Forces and Braking
1. Thinking Distance
  1. Thinking distance is the distance traveled by the driver before reaction.
  2. The faster the vehicle, the further it will travel.
2. Braking Distance
  1. Braking distance is the distance traveled by the vehicle when the brakes are applied.
  2. The faster the vehicle is traveling the bigger braking distance.
3. Stopping Distance
  1. The stopping distance is the distance covered by the vehicle altogether.
  2. The equation is Braking distance + Thinking distance.
Acceleration and Velocity.
1. Acceleration is the rate of change in velocity (speed in a straight line).
2. The equation : A = (V - U) / T
  1. A is the acceleration in m/s squared
  2. V is the final velocity in m/s
  3. T is the time taken in seconds s
  4. U is the initial velocity in m/s

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