Success Homeschool

Year 11 Science · Motion and Newton's laws

Name: ______________________

Date: ____________

1. A car travels 300 m in 15 s. What is its average speed?
- ☐ (a) 15 m/s
- ☐ (b) 20 m/s
- ☐ (c) 45 m/s
- ☐ (d) 4500 m/s
2. What is 72 km/h in m/s?
- ☐ (a) 20 m/s
- ☐ (b) 7.2 m/s
- ☐ (c) 259.2 m/s
- ☐ (d) 36 m/s
3. Which of Newton's laws explains why passengers lurch forward when a bus brakes suddenly?
- ☐ (a) Third law
- ☐ (b) Second law
- ☐ (c) Law of gravitation
- ☐ (d) First law
4. A rocket pushes hot gas downwards. What pushes the rocket upwards?
- ☐ (a) The air underneath it
- ☐ (b) Gravity
- ☐ (c) The gas pushing back on the rocket
- ☐ (d) The rocket's inertia
5. A net force of 10 N acts on a 2 kg trolley. What is its acceleration?
- ☐ (a) 20 m/s²
- ☐ (b) 0.2 m/s²
- ☐ (c) 12 m/s²
- ☐ (d) 5 m/s²
6. A runner covers 100 m in 12.5 s. What is the average speed in m/s? (number)
7. A car goes from 0 to 24 m/s in 6 s. What is its acceleration in m/s²? (number)
8. What is the unit of force? (one word)

Answer sheet

1. 20 m/s — 300 ÷ 15 = 20 m/s.
2. 20 m/s — 72 ÷ 3.6 = 20 m/s.
3. First law — Passengers' bodies keep moving due to inertia (first law).
4. The gas pushing back on the rocket — Newton's third law: the gas pushes on the rocket with an equal and opposite force.
5. 5 m/s² — a = F ÷ m = 10 ÷ 2 = 5 m/s².
6. 8 — 100 ÷ 12.5 = 8 m/s.
7. 4 — a = (24 − 0) ÷ 6 = 4 m/s².
8. newton — Force is measured in newtons (N).