CBSE Class 9 Physics Force and Laws of Motion
Friction force resists motion between two objects that are in contact with each other.
If the resultant of all the forces acting on a body is zero, the forces are called balanced forces and if the resultant of all the forces acting on a body is non zero, the forces are called unbalanced forces.
Newton's First Law of Motion
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.
Newton's Second Law of Motion
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.
Conservation of Linear Momentum
The velocity with which the gun recoils in the backward direction is known as recoil velocity
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