Force and Newton’s Laws Of Motion

Forces A push or pull that accelerates an object having some mass is known as force. It is considered a vector quantity as it has both direction and magnitude. The SI unit of force is known as Newton (N). It is kg m/s2. a) Two skaters pushing the third skater in different directions with forces … Read more

Motion in a Vertical Circle

Summary Centripetal force can be defined through a formula  . Whenever an object is rotating in a vertical circle, the gravitational and centripetal forces act along the same axis at the top and bottom of the arc. Wheel of a vehicle and a Ferris wheel are both examples of motion in a vertical circle. At … Read more


Summary A moment is the turning effect a force has around a point. In order for a moment to develop, the force must act upon the body in such a manner that the body would begin to twist. Moment = Force X Perpendicular Distance For a body or particle in equilibrium the total moments either … Read more

Impulse and Momentum

Summary Momentum is a measure of the quantity of motion of a moving body, due to its mass and velocity. ( Momentum = Mass X Velocity ). The law of conservation of momentum states total momentum before a collision equals total momentum after a collision. Impulse is basically change in momentum of a particle in … Read more

Centre of mass

Summary The centre of mass of a body or a system of particles is defined as a single point at which the whole mass of the body or system is imagined to be concentrated and all the applied forces acts at that point. In other words the concept of the center of mass is as … Read more

Newton’s Law of Restitution

Summary Newton’s law of restitution states that when two bodies collide, the speed with which they move after the collision actually depends on the material from which they are made. The Coefficient of Restitution (e) tells us about the bounciness, or elasticity, of the collision. When e = 1, no kinetic energy is lost When … Read more