Newton’s Laws of Motion

first law of motion

A body remains at rest or in motion with a constant velocity unless an external force acts on the body.

second law of motion

The sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces.

third law of motion or law of action and reaction

For every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force.

What Is Inertia?

Inertia is an objects tendency to retain initial velocity with the absence of an external force.

What Is Mass?

Mass is the measure of an objects inertia.

What Is Weight?

Weight is the gravitational force acing on an object which is measured by a scale.

What Is The Difference Between Weight & Mass?

An Object always has mass but doesn’t always have weight.

What Is Net Force?

Net force is the overall force acting on an object.

What Is Normal Force?

Normal Force is perpendicular to the surface-reaction (contact) force.

What Is Frictional Force?

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

What Is Static Friction?

Static friction is the friction that exists between a stationary object and the surface on which it’s resting.

What Is Kinetic Friction?

Kinetic friction is a force that acts between moving surfaces.