Forces and Motion Revision

Name:

Date:

📚 Part 1: Multiple Choice & Quick Checks (20 minutes)

1. What is a force?

A type of energy

A push or a pull that can change motion

A measure of mass

2. Check all non-contact forces:

Gravity

Friction

Magnetism

Normal force (a support contact force)

3. Which list shows the four forces commonly acting on a moving object?

Gravity, friction, normal (support), applied force

Tension, thrust, speed, mass

Weight, pressure, temperature, velocity

4. Which situation describes balanced forces?

A book resting on a table with no movement

A car accelerating from rest

A parachute falling rapidly

✏️ Part 2: Short Answers, Calculations & Application (40 minutes)

5. In your own words, explain the difference between contact and non-contact forces. Give one clear example of each.

6. Force diagram (use F = ma afterwards): A trolley on a level surface has these horizontal forces: 30 N to the right from a push, friction 8 N to the left, and a 5 N pull to the left. a) Calculate the net horizontal force and state the direction. b) If the trolley mass is 10 kg, calculate the acceleration (m/s²).

7. Weight using F = mg. A student has mass 52 kg. Calculate their weight (force due to gravity) on: a) Earth (g = 9.8 m/s²) b) Moon (g = 1.62 m/s²) c) Mars (g = 3.71 m/s²). Show your working and include units (N).

8. Speed and graphing: a) A kayak travels 18 km in 2 hours. Calculate its average speed in km/h. b) Use the table below to plot a distance vs time graph on the drawing box (label axes). Time in minutes, distance in kilometres: 0 min → 0 km; 10 min → 1.8 km; 20 min → 3.5 km; 30 min → 5.0 km.

9. Friction: Define friction and give one example where friction is useful and one example where it interferes with motion.

10. Ngā tohu (Māori environmental indicators) — short reading & response. Read: Māori used maramataka, tohu and whakapapa to understand natural patterns. Examples: birds (ngā manu) moving inland can warn of rough sea; red skies at dawn can signal incoming weather; pōhutukawa blooming signals seasonal change. Explain briefly how two of these indicators (choose two) could help a fishing waka decide whether it is safe to go to sea.

✅ Extension & Support (Differentiation)

Support (for learners who need it):

Dyslexia-friendly tips: Read questions aloud; highlight key words (force, mass, acceleration); work with a partner; use a calculator for arithmetic. Use small, short steps and draw simple arrows to represent forces.

Extension (advanced learners):

Challenge 1: Using gravitational accelerations, calculate the weight of a 75 kg astronaut on Jupiter (g = 24.79 m/s²) and compare to Earth. Explain why mass stays the same while weight changes.
Challenge 2: Design a short experiment to measure friction between two surfaces. Describe variables to control and how you would calculate the frictional force.

Teacher note — time & marking:

Estimated time: 60 minutes. Mark key calculations for correct method and units. For NZ context, accept explanations that reference maramataka, ngā tohu huarere, and whakapapa connections.