All physics Grade 11 definitions

Definitions

Weight

The gravitational force the Earth exerts on any object on or near its surface

Normal force

The force or the component of a force which a surface exerts on an object with which it is in contact, and which is perpendicular to the surface

Frictional force

The force that opposes the motion of an object and which acts parallel to the surface

Static frictional force

The force that opposes the tendency of motion of a stationary object relative to a surface

Kinetic frictional force

The force that opposes the motion of a moving object relative to a surface

Newton’s First Law of Motion

A body will remain in its state of rest or move at constant velocity unless a non-zero resultant/net force acts on it

Newton’s Second Law of Motion

When a resultant/net force acts on an object, the object will accelerate in the direction of the net force. This acceleration is directly proportional to the force and inversely proportional to the mass of the object

Newton’s Third Law of Motion

When object A exerts a force on object B, then object B exerts a force on object A equal in magnitude but opposite in direction

Resultant force

The resultant force is the single force having the same effect as all the other forces acting together at the same point.

Newton's Law of Universal Gravitation

states that every particle in the universe attracts every other particle with a force F which is directly proportional to the product of their masses m1 and mz and inversely proportional to the square of the distance r between their centres.