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Forces and Motion Calculations
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Jonas.TuitionForces and Motion Calculations
📚 Part 1: Multiple Choice (Use g = 9.8 N/kg where needed)
1. Which is the correct SI unit for force?
Newton (N)Kilogram (kg)Metre per second (m/s)Joule (J)
2. Which statement best describes weight?
Mass × acceleration due to gravityMass × velocityThe force that opposes motionStored energy in an object
3. A 2 kg book rests on a table. What is its weight (to 3 s.f.)?
2 N19.6 N0.2 N200 N
4. A car of mass 800 kg accelerates at 2 m/s². What is the resultant force?
400 N1 600 N4 000 N800 N
✏️ Part 2: Calculations & Short Answers
5. Calculate the weight of a 7.5 kg bag. Show working and give the answer in newtons (N).
6. A skydiver has mass 70 kg.
a) Calculate their weight on Earth (g = 9.8 N/kg).
b) Calculate their weight on the Moon (g = 1.6 N/kg).
7. A force of 45 N causes a 9 kg object to accelerate. Calculate the acceleration (m/s²). Show your working.
8. A 1 500 kg lorry is braked by a force of 6 000 N. Calculate its deceleration (m/s²). State the value as negative to show it is slowing down.
9. Draw and label the forces acting on a stationary box on a horizontal floor. Include at least: weight, normal force and friction (if any).
10. An object weighs 294 N on Earth. Calculate its mass (kg). Show your working.
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