- Inertia is the tendency of an object to remain in its state of rest or of uniform motion in a straight line.
- Law of inertia is also known as Newton's First Law of Motion
- Newton's First Law of Motion state that an object will in its state of rest or of uniform motion in a straight line unless it is acted upon by a net external force.
When the cardboard is jerked quickly, the coin will fall into the glass.Explanation:
- The inertia of the coin resists the change of its initial state, which is stationary.
- As a result, the coin does not move with the cardboard and falls into the glass because of gravity.
Pull slowly - Thread A will snap.
- Tension of thread A is higher than string B.
- Tension at A = Weight of the load + Pulling Force
Yank quickly - Thread B will snap.
- The inertia of the load prevents the force from being transmitted to thread A, hence causing thread B to snap.
For further examples, click on the diagram below to play!