Force and Laws of Motion

Force and Laws of Motion  

Force is a push or pull acting upon an object.

Balanced forces: The resultant of all the forces acting on a body is zero.

Unbalanced forces: The resultant of all the forces acting on a body is not zero.

Newton’s first law of motion states that A body at rest will remain at rest and a body in motion will remain in uniform motion unless acted upon by an unbalanced force.

The property by the virtue of which an object tends to remain in the state of rest or of uniform motion unless acted upon by some force is called inertia.

The mass of a body is a measure of inertia.

The momentum of an object is the product of its mass and velocity and has the same direction as that of the velocity. Its SI unit is kg m s^-¹.

Newton’s second law of motion states that the rate of change of momentum of a body is directly proportional to the force and takes place in the same direction as the force.

Force is also defined as the product of mass and acceleration.

The SI unit of force is kg m s^-². This is also known as newton and represented by the symbol N. A force of one newton produced an acceleration of 1 m s^-² on an object of mass 1 kg.

Force of friction always opposes motion of objects.

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