FORCEIs a push or pull exerted by another body to another

Three Laws of Motion

Law of inertia – A body at rest will remain at rest. A body when in motion will continue to move with constant velocity unless acted upon an unbalanced external force.

Law of Acceleration – Force is equal to mass times acceleration (F=ma)

Law of Interaction – When body A exerts a force in body B, body B exerts an equal but opposite force on body A. Action and reaction forces act on two different bodies and will not cancel each other. You cannot touch without being touched.

Force is a push or pull exerted by one body on another body. It affects the state of motion of the body. The application of force may also change the size and shape of the body.

Fundamental Forces

Gravitational force – is responsible for weights of the bodies on Earth as well as for the motion of the planets.

Electromagnetic force – is an attractive or repulsive force between charged bodies.

Strong nuclear force – holds the constituents of the nucleus together.

Weak nuclear force – plays a role in the radioactive decay of some nuclei.

Aristotle vs Galileo

Aristotle considered that the natural state of a body is to remain at rest and a force is needed to act on a body for it to move and keep it moving. He added: velocity of the object is proportional to the force applied. Galileo concluded that the natural tendency of a moving object is to continue moving and no force is required to keep it moving.