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27 Cards in this Set
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Terminal velocity 
Constant velocity of a falling object when the net force is zero



Newton’s first law of motion

A body that is at rest continues to be at rest, and a body in motion continues to move with uniform velocity, unless a net external force acts on it.



Newton’s second law of motion

The rate of change of momentum of a body is directly proportional to the net force acting on it, and occurs in the direction of the net force.



Newton’s third law

If a body A exerts a force on body B, then body B exerts a force on body A of the same type and magnitude, but in the opposite direction.

If body A...


Inertia

Inertia of a body is its reluctance to start moving and reluctance to stop once it has begun moving.

Two cases


Mass

Mass is a measure of the inertia of an object.



Weight

The gravitational force acting on an object towards the centre of the Earth.



Linear momentum

p of an object is the product of its mass and its linear velocity.



Impulse

Impulse is the product of the force acing on an object and the duration over which it acts.



Conservation of linear momentum

The total linear momentum of a system remains constant provided that no net external force acts on it.



Elastic

A perfectly elastic collision is one where the total kinetic energy is conserved.



RSOS = RSOA

Derived from conservation of KE and of momentum. Get a difference of squares equation, then divide KE equation by momentum equation.



Field of force

Region of space in which an object can exert a force on certain bodies not in contact with it.



Electric field

Region of space in which a stationary charge will experience an electrical force.



Gravitational field

Region of space where a force acts on a mass.



Magnetic field

Region of space where a force acts on a moving charge or a magnet.



Frictional force

Force that opposes motion between two surfaces in contact.



Viscous force

Resistive force that an object experiences when it moves through a fluid.

Fluid


Tension

Force exerted by a string or cable when it is pulled tight by opposite ends.



Hooke’s law

The magnitude of force exerted by a spring on an object attached to it is directly proportional to the length of extension from equilibrium, given that the elastic limit of the spring is not exceeded.



Pressure

Normal force exerted per unit area.



Upthrust

The force exerted on an object due to the displacement of fluid in which the object is submerged.



Principle of flotation

A submerged object displaces a weight of fluid equal to its own weight.



Centre of gravity

The point at which the whole weight of the object seems to act.



Moment/Torque

The product of the force and the perpendicular distance from the force to the pivot.



Couple

Two forces that are antiparallel, of equal magnitude, and do not act along the same line of action. They produce only a turning effect.

Do not act along the same line of action!


Equilibrium

No net moment acting on the body about any point, No net force acting on the body. 
