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- 1. Unit P4 Explaining Motion Next page
- 2. The topics in this unit are: 1 – Forces 2 – Opposite forces 3 – Forces and motion 4 – Speed and velocity 5 – Calculating speed 6 – Distance time graphs 7 – Velocity time graphs 8 – Momentum 9 - Collisions 10 – Kinetic energy 11 – Gravitational potential energy 12 – Work Next page
- 3. Forces Forces happen when two objects interact with each other Main menu Next page Examples of forces are Gravity Air resistance Friction Thrust Upthrust
- 4. Opposite Forces Main menu Next page Forces occur because of an interaction between two objects This means forces always come in pairs (interaction pairs) They are equal in size and opposite in direction Example If two people are standing on skateboards and one pushes the other, both skateboards move away from each other
- 5. Forces and Motion Main menu Next page Arrows are used in diagrams of forces to show the size and direction. If more than one force acts on an object, the forces will add up it they are in the same direction or subtract if they are acting in the opposite direction . The overall effect is called the resultant force.
- 6. Speed and Velocity Main menu Next page Speed tells you how far an object will travel in a certain time e.g. A lorry travels along a road at 15 m/s Velocity tells you the objects speed and direction
- 7. Calculating Speed Main menu Next page To calculate the speed of an object we need to know two things - the distance it has travelled - the time it took to get there We use the formula Speed (m/s) = distance travelled (m) time (s) Example An object travels 10 metres in 5 seconds. What speed was it travelling at? Speed (m/s) = 10m = 2m/s 5s
- 8. Distance Time Graphs Main menu Next page The slope of a distance time graph is a measure of the speed of an object. The steeper the slope, the greater the speed. Speed = 0 = 0m/s 5 Speed = 10 = 2m/s 5 Speed = 15 = 3m/s 5
- 9. Velocity Time Graphs Main menu Next page The slope of a velocity time graph shows how quickly an object is increasing in speed i.e. the faster the slope the faster its speed is increasing Velocity = 10 - 0 = 2m/s 2 5 Velocity = 15 - 0 = 3m/s 2 5 Velocity = constant speed
- 10. Momentum Main menu Next page Momentum is a measure of the motion of an object. We work it out by momentum (kg m/s) = mass (kg) x velocity (m/s) Example A car has mass 1200kg. It is travelling at a velocity of 30m/s. calculate the momentum momentum = 1200 x 30 = 36000 kg m/s Change in momentum can be calculated by change of momentum (kg m/s) = force (N) x time it acts (s)
- 11. Collisions Main menu Next page If a car is involved in a collision it comes to a sudden stop – a change in momentum The smaller the time for the car to stop, the larger the force acting on it and the more damage can be caused Any sudden change in momentum will not only affect the car but also the passengers . Seat belts, crumple zones and air bags are designed to reduce the force of impact.
- 12. Kinetic Energy Main menu Next page A moving object has kinetic energy . The amount of kinetic energy depends on - the mass of the object and the velocity of the object It can be calculated by kinetic energy (J) = ½ x mass (kg) x velocity 2 (m/s 2 ) Example A bicycle of mass 50kg is moving at a velocity of 8m/s 2 . How much kinetic energy does it have? Kinetic energy = ½ x 50 x 8 2 = ½ x 50 x 64 = 1600 J
- 13. Gravitational Potential Energy Main menu Next page An object lifted above the ground has gravitational potetnialk energy We cam calculate gravitational potential energy with the formula: gravitational potential = weight (N) x vertical height difference (m) energy (J)
- 14. Work Next page Main menu When a force moves an object, work is done on the object leading to a transfer of energy. The amount of work done is calculated by: work done (J) = force (N) x distance moved (m ) Example A car needs to be pushed with a force of 100N to overcome friction. If the car is pushed for 5m, calculate the work done Work done = 100N x 5m = 500 J

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