Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 99 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.⚙️ Which simple machine is a knife edge? (a) wedge (b) pulley (c) inclined plane (d) lever
2. 2.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
3. 3.True or false: a tyre with deep treads gives less friction. (a) True (b) False
4. 4.Which of these is a screw? (a) a well winch handle (b) a crane hook block (c) a bottle cap (d) a wheelchair ramp
5. 5.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crowbar (c) a wood screw (d) a seesaw
6. 6.Which of these is caused by magnetic force? (a) an apple falls down (b) rain falls to the ground (c) rubbing hands warms them (d) a compass needle turns
7. 7.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
8. 8.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
9. 9.True or false: a tug of war is a pull. (a) False (b) True
10. 10.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
11. 11.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
15. 15.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
18. 18.💪 A force is a … (a) type of sound (b) kind of colour (c) push or a pull (d) unit of time
19. 19.True or false: a fixed pulley stays in one place. (a) False (b) True
20. 20.⚖️ A lever bar balances. The load is 1000 N at ? cm from the fulcrum. The effort is 100 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.💪 A cart is pulled to the right with 70 N and to the left with 65 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
22. 22.⚖️ A seesaw balances. Kabir (340 N) sits 2 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.⚖️ A seesaw balances. Meena (380 N) sits ? m from the pivot on one side; Zoya (570 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
24. 24.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
25. 25.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
26. 26.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
27. 27.⚙️ Which simple machine is a nutcracker? (a) screw (b) pulley (c) wheel and axle (d) lever
28. 28.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a grippy rubber sole
30. 30.💪 A cart is pulled to the right with 75 N and to the left with 85 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
31. 31.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
32. 32.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
33. 33.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
34. 34.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
35. 35.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
36. 36.True or false: a movable pulley halves the effort. (a) False (b) True
37. 37.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
38. 38.⚖️ A seesaw balances. Arjun (480 N) sits 2 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ A force of 200 N pushes a cart 1 m along the floor. How much work is done, in joules?
40. 40.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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