Physics Flashcards
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.
Vector
A physical quantity that has both magnitude and direction.
Scalar
A physical quantity that only has 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 change of displacement
Acceleration
Rate of change of velocity
Inertia
The property of an object that cause it to resist a change in its state of rest or uniform motion.
Weight
The gravitational force the Earth exerts on any objection or near its surface.
Normal force
The perpendicular force exerted by a surface on an object in contact with it.
Frictional force -
The force that opposes the motion of an object.
Tension in a string
The tension in a string is the same throughout the entire string
Newton’s Law of Universal Gravitation
Every object in the universe attracts every other object in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
Terminal velocity
Frictional force = weight
Weight
The gravitational force that the Earth exerts on an object
Momentum
The product of the mass and velocity of an object.
Momentum makes something hard to stop. (kg.m.s)
Collision
An isolated event in which two or more moving bodies exert forces on each other over a relatively short time.
Elastic collision
A collision in which kinetic energy is conserved.
Inelastic collision
A collision in which kinetic energy is not conserved
