Last updated on May 3rd, 2023 at 04:49 pm
Statement of three laws of Motion along with their concept building – that is the objective of this post.
Statement of three laws of Motion
Here we state the 3 laws of motion:
- Newton’s 1st Law of Motion states that Every body continues in its state of rest, or of uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.
- Newton’s 2nd Law of motion states that the rate of change of momentum of a body is proportional to the net force impressed, and this change is made in the direction of that force impressed.
- Newton’s 3rd Law of Motion states that To every action, there is always an equal and opposite reaction.
Laws of Motion – some very important information
- An object will not change its state of motion (i.e., accelerate) unless an unbalanced force acts on it. Equal and oppositely directed forces do not produce acceleration.
- If no unbalanced force acts on an object the object remains at constant velocity or at rest.
- Our mass does not change when we move to other planets, because mass is a measure of how much matter our body contains, and not how much gravitational force we feel.
- Newton’s 3rd Law states for every force there is an equal but opposite reaction force. To distinguish a third law pair from merely oppositely directed pairs is difficult but very important.
- Third law pairs must obey three rules: they must be of the same type of force, they are exerted on two different objects and they are equal in magnitude and oppositely directed.
- Examples of third law pairs: A block sits on a table. The Earth’s gravity on the block and the force of the table on the block are equal and opposite. But these are not third-law pairs, because they are both on the same object and the forces are of different types. The proper third law pairs are: (1) earth’s gravity on block & block’s gravity on earth and (2) table pushes on block & block pushes on the table.