First Law of Motion
“An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.”
Also called the Law of Inertia, an object will stay at rest or in motion indefinitely, unless an external or unbalanced force acts upon this object.
Inertia of an object is dependent upon the mass of an object. Greater the mass of an object greater is the inertia.
Eg: Water in a bottle continues moving forward even though the bottle has come to a halt.
Shaalaa.com | Aristotle and Galileo's law
A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because
(a) the batsman did not hit the ball hard enough.
(b) velocity is proportional to the force exerted on the ball.
(c) there is a force on the ball opposing the motion.
(d) there is no unbalanced force on the ball, so the ball would want to come to rest.
Fill in the following blank with suitable word :
Newton’s first law of motion is also called Galileo’s law of ………………………