Card Set Information
State Newton's 1st Law.
An object at rest remains at rest and an object in motion remains in motion at a constant speed in a straight line unless acted on by an unbalanced force.
State Newton's 2nd Law.
F=Ma. The acceleration is proportional to, and in the same direction as, the net force acting.
State Newton's 3rd Law
Every action has an equal and opposite reaction
Distinguish between average speed and instantaneous speed.
Average speed is the speed over a period of time; instantaneous speed is the speed at a particular instant in time.
Define linear momentum.
The product of mass and velocity. p=mv.
State the principal of conservation of momentum.
The total momentum of a system is constant; provided external force does not act.
Define impulse of a force.
I = Ft where t is the time for which the force F acts / the change in momentum.
Distance traveled in a particular direction. Vector.
Rate of change of displacement. Vector.
Rate of change of distance. Scalar
Rate of change of velocity. Vector.
Define translational equilibrium.
Net force acting on a body is zero.
Outline what is meant by work.
The product of a force on an object and the displacement of the object in the direction of the force. W=Fs.
State the principle of conservation of energy.
The total energy of an isolated system remains constant. Energy cannot be created or destroyed, only transferred from one form to another.
Distinguish between elastic and inelastic collisions.
Elastic collision, kinetic energy is conserved. Inelastic, kinetic energy is not conserved.
Define the concept of efficiency
The ratio of the useful energy/power/work output to the total energy/power/work input.