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38 Cards in this Set
 Front
 Back
Displacement 
The distance travelled in a particular directions from a specified origin. 

Velocity 
The rate of change of displacement with time. ms^1 

Speed and Distance 
The scalar versions of velocity and displacement. 

Accelerations 
The rate of change of velocity with time. ms^2 

Instantaneous 
The value or quantity measured at an instant in time. 

SUVAT Equations 
s = 0.5(u + v)t s = ut + 0.5at^2 v^2 = u^2 + 2as a = (v  u) / t 

Acceleration due to gravity (g) 
g = 9.8 ms^2 ( = 10 ms^2) 

Terminal Velocity 
When air resistance is equal to the opposing forces (proportional to the speed), results in no net forces and constant velocity. 

Relative Velocity 
Velocity measured from the point of view of another (moving) object. 

Weight 
W = mg Measured in Newtons (N). 

What is a Newton 
The force required to accelerate an object of 1kg by 1 ms^2. 

Normal Reaction 
When two objects in contact each exert a force on the other which is perpendicular to the surface. 

Tension 
A force produced on a body when opposing forces are stretching it. Compression force is the opposite. 

Upthrust 
An upward force on a body which is immersed in a fluid (liquid or gas). 

Lift 
An upward force on the wing of an aircraft which due to the airflow around it. 

Translational Equilibrium 
When the net force of an object is 0 in all directions. 

Rotational Equilibrium 
When the net torque on an object is 0 about all axes. 

Newton's First Law 
A body will continue its state of rest or of uniform motion in a straight line unless acted upon by an external force. 

Inertia 
The property of matter which makes it resist acceleration. 

Linear Momentum 
p = mv The product of mass and velocity. Measured in kgms^1. 

Impulse 
Impulse = FΔt = mΔv The change in momentum. Measured in Ns. 

Newton's Second Law 
F = ma = Δp / Δt The rate of change of momentum of an object is proportional to the applied force and takes place in the direction in which the force acts. 

Newton's Third Law 
When a particle A exerts a force on another particle B, B simultaneously exerts a force on A which is equal and opposite in magnitude. 

Law of Conservation of Momentum 
The momentum of an isolated system remains constant when no external forces are acting upon it. 

Work 
Work is done when a force moves an object in the directions of the force. W = Fscos(theta) 

Joule 
An SI unit of energy. 1J = 1Nm 

Work done by a nonconstant force 
Work is done in the area under the forcedistance graph. Eg, Hooke's Law ( W = 0.5kx^2) 

Energy 
The ability to do work. 

Kinetic Energy 
Energy of an objects as a result of its motion. E = 0.5mv^2 = p^2 / 2m 

Gravitational Potential Energy 
Energy an object has as a result of its position in a gravitational field. E = mgΔh 

Principle of Conservation of Energy 
Energy is never created or destroyed, it just changes from one form to another. 

Elastic Collisions 
KE is conserved in these collisions. 

Inelastic Collisions 
KE is not conserved in these collisions. If objects stick together, the collision is perfectly inelastic. 

Explosive Collisions 
KE is increased in this collision. 

Power 
P = Fv The rate of doing work. In W (or Js^1) 

Efficiency 
Fraction of energy which is usefully transferred. Useful work done / Total work done 

Centripetal Acceleration 
a = v^2 / r The acceleration of a body moving in a circle. Directed towards the centre of a circle. A body with a centripetal acceleration must be under the influence of a centripetal force. 

Centripetal Force 
F = mv^2 / r 