Newton's Third Law and Inertia
Newton's Third Law is:
When two objects interact, the forces they exert on each other are equal and opposite.
Newton's Third Law means that whenever one object exerts a force on a second object, the second object exerts an equal force in the opposite direction back on the first object.
Imagine you're sitting in a chair. When you push down on the chair, the chair pushes back up on you with an equal force. This is why you don't fall through the chair. Similarly, when you walk, your foot pushes backward against the ground, and the ground pushes forward on your foot, propelling you forward.
So, Newton's third law tells us that forces always come in pairs. If you push on something, it pushes back on you with the same force but in the opposite direction.
Inertia is the tendency of an object to resist changes in its motion. Objects with more mass have more inertia, meaning they are harder to accelerate or decelerate.
Imagine you're in a car that suddenly stops. If you're not wearing a seatbelt, you'll feel like you're being pushed forward. This is because your body wants to keep moving at the same speed and in the same direction as the car was going. This resistance to change in motion is inertia.
Similarly, if you try to push a heavy box, it's harder to get it moving than a lighter box because the heavy box has more inertia.
