Question

Newton's first law of motion states that an object will keep a constant speed and direction unless acted upon by an unbalanced force. To test this statement, Martin rolled a ball on a long, level street. The ball did not bump into any object, but it eventually came to a stop. How is this possible? Martin did not roll the ball hard enough, which caused the ball to eventually stop rolling. The unbalanced force that caused the ball to stop was friction. Every moving object must come to a stop because energy cannot be destroyed. Newton's first law of motion only holds true in space, not on Ea

Answer 1

Hahahaha... dear its for questions... not for articles... :)

Answer 2

There is another force that causes the ball to stop, that is gravitational force...

Answer 3

"Newton's first law of motion only holds true in space, not on Earth"

This sentence is nonsense. Newton's laws are universal, they hold on Earth, on the Moon, in "Space" etc.

Answer 4

@Vincent-Lyon.Fr this statement partly true because on earth there are always the forces which inturept the motion of the objects. gravitational force, friction, air friction etc. but its not completely true that Newton first law do not hold on earth...

Answer 5

Martin initially applied a force to the ball, which started the ball moving. After the ball left his hand, the force he applied was no longer there.

So we have this ball rolling, but instead of keeping its constant speed it comes to a stop! And according to Newton's first law, an object will keep a constant speed and direction unless acted upon by an unbalanced force. So if the ball comes to a stop, it has CHANGED its speed, right? So there must be an UNBALANCED force!

Our options:

1. Martin did not roll the ball hard enough
Well if he rolled it harder it would start out with a faster speed, but we know that it would eventually come to a stop.

2. The unbalanced force that caused the ball to stop was friction.
This makes sense. We know there is an unbalanced force on the ball, and friction happens to be a force that is always in the direction opposite of motion.

3. Every moving object must come to a stop because energy cannot be destroyed.
Energy cannot be destroyed, but it can be transferred! Perhaps the energy is transferred out of the ball through friction ;)

4. Newton's first law of motion only holds true in space, not on Earth
Newton's laws are universal! So you can apply them to Earth, space, other planets, etc. He was actually one of the first ones to make the connection between motion on Earth, and motion out in space. In the Newton-apple story (when he sees the apple fall from the tree), he wonders if the force (gravity) that pulls the apple to the ground on earth could reach out all the way out to other planets!

I hope this gives you a little bit of insight.

Answer 6

@IhteshamMalik I think Newton's First Law is universal. It states that an object will either keep moving at a constant velocity (or stay at rest) unless it has an unbalanced force acting on it. In order for there to be a change in direction or velocity, there must be an UNBALANCED force.

You are right that on Earth there are forces that can interrupt (or start) an object's motion (friction, gravity, etc.). But these forces will only affect the movement of an object if they are UNBALANCED! So Newton's First Law is completely true on Earth!

Answer 7

yup its an universal law. in fact i read that point some where which i told here..

Answer 8

What is the period of a satellite in a circular orbit just above the surface of the Moon? The Moon’s mass is 7.36 × 1022 kilograms and its radius is
1.738 × 106 meters.


1.94 × 104 seconds
1.30 × 104 seconds
6.50 × 103 seconds
3.24 × 103 seconds
1.62 × 103 seconds

Answer 9

3rd answer is correct. \[6.50\times 10^{3} seconds\]

Answer 10

@Mahnoor19
Please post any new question as a... new question ;-)