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Physics Definitions
Module 2 Forces in action
| Question | Answer |
|---|---|
| Newton's second law | net force = mass x acceleration |
| The newton | Unit of force. 1N is the force that gives a mass of 1kg an acceleration of 1m/s^2 |
| Drag | The resistive force that acts on a body when it moves through fluid |
| Weight | The gravitational force acting on an object measured in Newtons |
| Terminal Velocity | The velocity at which an object's drag equals to it's accelerating force. therefore there is no resultant force and zero acceleration |
| Equilibrium | When the net force and net moment on an extended object is zero |
| Centre of gravity | this is the point where the entire weight of an object appears to act |
| Triangle of forces | If three forces acting at a point can be represented by the sides of a triangle, the forces are in equilibrium |
| Couple | This is a pair of forces that tends to produce rotation only. They are two forces that are equal in size but act in opposite directions but not in the same straight line |
| Torque of couple | The turning effect of a couple measured in Nm. |
| Moment of a force | The turning effect due to a single force. Calculated from the force multiplied by the perpendicular distance from a given point. |
| Principle of moments | For a body rotational equilibrium the sum of the clockwise moments equals to the sum of the anticlockwise |
| Density | the mass per unit volume |
| Pressure | Force per unit area |
| Thinking distance | The distance travelled from seeing the need to stop to applying the brakes |
| Braking distance | The distance travelled by a vehicle whilst decelerating to stop |
| Stopping distance | The distance a vehicle travels whilst decelerating to stop. The sum of the thinking distance and braking distance |
| Crumple zone | An area of a vehicle designed to increase the distance over which the vehicle decelerates and so reduce the average force acting |
Created by:
AliceP
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