Force and Acceleration
Class 9 Science: force and laws of motion (F = ma)
Push a trolley with different forces and masses. See Newton's second law in action: a = F ÷ m.
Words to know
- Force
- A push or pull, measured in newtons (N).
- Mass
- How much matter an object has, in kilograms (kg).
- Acceleration
- How quickly speed changes, in metres per second squared (m/s²).
- Newton's second law
- Force = mass × acceleration (F = ma).
Quick check
Answer 3 questions to check what you learned.
Try at home
Push an empty shopping bag and then a full one with the same small push on a smooth floor. Which speeds up more? That is a = F ÷ m.