MECHANICS: Newtons Laws and Applications of Newtons Laws

Normal force

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

Weight

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

Frictional force

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

Static friction

The force that opposes the tendency of motion of a stationarry object relatve to a surface

Kinectic friction

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

Coefficient of kinectic friction

The ratio of the kinectic friction force to the normal force

Newtons First Law Motion

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

Newtons Second Law of Motion

When a non-zero resultant/net fote acts on an object, the object wil accelerate in the direction of the force at an acceleration directly prportional to the forc and inversly proportional to the mas of the object

Newtons Thrid Law of Motion

When Object A exerts a force on Object B, Object B simultaneosuly exerts an oppositely directed force of equal magnitude on Object A

Inertia

The resistance of an object to any change in its state of motion. The mass of an object is a quantitve measure of its inertia.

Explain it is important that passengars wear a safetly belt

They exert a non-zero force that allows the passengar to expiernce the same deceleration as the vehicle