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# Physics Definitions

### Module 2 Forces in action

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