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Welcome! Today we are going to explore how things move and why they stop, using three simple but powerful rules discovered by Sir Isaac Newton.
Have you ever wondered why a soccer ball stays perfectly still on the grass until you kick it? Or why it's so hard to slide across concrete compared to ice? These everyday puzzles are all explained by Newton's Laws of Motion.
Newton's First Law is also called the Law of Inertia. It states that an object at rest will stay at rest, and an object in motion will keep moving in a straight line at a constant speed, unless an unbalanced force (like friction or a push) acts on it.
Newton's Second Law shows that Force equals Mass times Acceleration (F = m × a). This means that a heavier object (more mass) requires a much stronger push (more force) to speed up at the same rate as a lighter object.
Newton's Third Law states that for every action, there is an equal and opposite reaction. This means forces always come in pairs! When you push down on a diving board, the diving board pushes back up on you, launching you into the air.
A toy car with a mass of 2 kg is pushed with a net force of 10 Newtons. What is the acceleration of the toy car?
- Identify the given values: Mass (m) = 2 kg, and Force (F) = 10 N.
- Recall Newton's Second Law formula: Force = Mass × Acceleration (F = m × a).
- Rearrange the formula to solve for acceleration (a): a = F / m.
- Substitute the known values into the equation: a = 10 N / 2 kg.
- Calculate the final answer: a = 5 m/s².
