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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 of a body is its reluctance to start moving and reluctance to stop once it has begun moving.
Two cases
Mass is a measure of the inertia of an object.
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 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.
A perfectly elastic collision is one where the total kinetic energy is conserved.
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.
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.
Normal force exerted per unit area.
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.
The product of the force and the perpendicular distance from the force to the pivot.
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!

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