Physics - P2 - AQA - GCSE - Forces

Physics - P2 - AQA - GCSE - Forces

1. A force acts on an object, affecting it in some way. All forces are measured in Newtons.

   • Resultant Force
     • The force which can replace all other forces acting upon it, although it still acts in the same way.
       • If an object has a force of 5N pulling it left, and a force of 10N to the right, it will move 5N to the right.
         • If the resultant force is 0, the object will remain stationary or continue steadily in one direction.
     • The resultant force acting on an object can cause it to accelerate or decelerate.
       • Resultant Force (N) = mass (kg) x acceleration m/s2
   • Hooke's Law
     • The extension of a spring is directly proportional to the force applied- provided the limit of proportionality is not exceeded.
       • Force (N) = Spring Constant (N/m) x Extension (m)
   • Distance-Time Graphs
     • Stationary
     • Slow Moving
     • Fast Moving
   • Velocity
     • 5m/s
   • Acceleration
     • 5m/s2
     • Acceleration (m/s2) = change in velocity over time (s)
   • Velocity-Time Graphs
     • Constant Velocity
     • Acceleration
     • Deceleration
     • Distance Travelled= Area of Triangle. 0.5x10x5=25m

2. Braking

   • Stopping Distance= Thinking Distance + Braking Distance
   • The Kinetic Energy of the car is converted into heat energy while braking.
     • If the wheels lock, the car slides and the Kinetic Energy is converted into heat energy by the friction of the road in the tyres.

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