Newtons Laws Flashcards
Newton’s law of universal gravitation
Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Gravitational field (g)
The force acting per unit mass
L(N.kg^-1)
Weight (Fg)
The gravitational force the earth exerts on any object on or near its surface
(N)
Mass (m)
The amount of matter which an object consists of.
Kg
Vector
A physical quantity that has both magnitude and direction
Scalar
A physical quantity that has only magnitude.
Resultant vector
The single vector which has the same effect as all the original vectors acting together
Distance
The length of path travelled
Displacement
Change in position
Speed
Rate of change of distance
Velocity
Rate of displacement
Acceleration
Rate of change of velocity
Inertia
The property of an object that causes it to resist a change in its state of rest or uniform motion
Normal force (FN)
The perpendicular force exerted by a surface on an object in contact with it
Frictional force (Ff)
The force that opposes the motion of an object.
Tension in a string / cable
The tension in a string / cable is the same throughout the entire string / cable.
Newton’s First Law
An object continues in a state of rest or uniform velocity unless it is acted upon by a net or resultant force
Newton’s Second Law
When a net force , Fnet is applied to an object of mass , m , it accelerates in the direction of the net force . The acceleration , a , is directly proportional to the net force and inversely proportional to the mass
Newton’s Third Law
When object A exerts a force on object B , object B simultaneously exerts an oppositely directed force of equal magnitude on object A.
