Forces Definitions

The rate of change of velocity.

It can be calculated from the gradient of a velocity-time graph

The distance a vehicle travels under the braking force.

This can be affected by adverse road and weather conditions as well as the condition of the vehicle.

The single point through which the weight of the object can be said to act

When a force acts on a moving object, or on an object that has the ability to move, a change of momentum will occur.

The force is equal to the rate of change of momentum

The total momentum of a system before an event is always equal to the total momentum of the system after the event. 

A force that occurs when objects are physically touching

A measure of how far an object moves in a given direction. 

It is the straight line between the starting and finishing points and is a vector quantity. 

A measure of how far an object moves, that does not depend on direction and is therefore a scalar quantity

Non-permanent deformation which allows the object to return to its original shape when the deforming forces are removed.

The force beyond which an object will no longer deform elastically, and will instead deform plastically.

All forces can be resolved into two perpendicular components that have the same effect as a single force

The single force that can replace all individual forces acting on an object and have the same effect

Quantities that only have a magnitude, not a direction.

A scalar quantity that is a measure of the rate of increase of distance

A measure of a springs stiffness,which is the constant of proportonality for a spring's extension.

The higher the spring constant, the smaller the extension is for a given force.

The sum of the thinking and braking distances.

The distance a vehicle travels during the driver's reaction time.

Typical human reaction times are in the range of 0.2-0.9 seconds. 

This reaction time may be affected by tiredness,drugs or alcohol.

The upward force acting on an object on a fluid, due to it experiencing a greater pressure below it then above it.

Quantities that have both a magnitude and a direction.

They are represented by an arrow, with the length representing the magnitude and the arrowhead representing the direction.

A vector quantity that is the measure of the rate of change of displacement.

It is the speed in a given direction.

The force acting on an object due to its gravity.

It is the equal product of the object's mass and the gravitational field strength at its location.

Work is done on an object when a force causes it to move through a distance.

It is directly proprotional to the distance travelled and the magnitude of the force in the direction of motion.

The energy stored in a spring  is stretched or compressed, due to the work done on the spring by the deforming force.

It is equal to the work done as long as the object does not plastically deform.

An object is in equilibrium if the resultant force and the resultant momet are both equal to 0.

A push or pull that an object experiences due to the interaction with another object. 

Force is a vector quantity.

The tendency of an object to remain in its same state of uniform motion or reset.

A measure of how hard it is to change an objects velocity.

It is defined as the ratio of force over acceleration.

The point beyond which the extension of an elastic object is no longer directly proportional to the force applied to it.

The product of an object's mass and velocity

A calibrated spring-balance used to measure weight

If a stationairy object's resultant force is 0, the object will remain stationairy.

If a moving objects resultant force is 0, the object will continue to move at the same speed and in the same direction.

An object's accleration is directly proportional to the force applied to it and inversely proportional to its mass.

The forces that two objects extert on each other when they interact are equal and opposite.

A force that occurs when objects are physically seperated

Permanent deformation which means the object will no longer return to its original shape when the deforming forces are removed.