Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 296 · 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.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 90 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
4. 4.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 350 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) on the fulcrum (d) far from the fulcrum
6. 6.🏋️ Pushing a crate 6 m took 1260 J of work. What force was used, in newtons?
7. 7.True or false: a movable pulley halves the effort. (a) False (b) True
8. 8.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
9. 9.🏋️ Pushing a crate 1 m took 300 J of work. What force was used, in newtons?
10. 10.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
12. 12.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
15. 15.💪 A box weighs 320 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.💪 A bag has a mass of 55 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
18. 18.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
19. 19.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) screw (c) wedge (d) lever
21. 21.Which of these is a lever? (a) the tip of a nail (b) a nut and bolt (c) a screw jack (d) a seesaw
22. 22.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
24. 24.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) wedge (c) lever (d) screw
25. 25.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a window blind cord (c) a well-bucket rope wheel (d) a road up a hill
26. 26.💪 Two children push a box to the right, one with 55 N and the other with 30 N. What is the net (total) force on the box, in newtons?
27. 27.Which of these is a wheel and axle? (a) a round doorknob (b) a bottle opener (c) a wood screw (d) a jar lid
28. 28.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
29. 29.💪 Two children push a box to the right, one with 100 N and the other with 65 N. What is the net (total) force on the box, in newtons?
30. 30.Which of these is a lever? (a) the tip of a nail (b) a well-bucket rope wheel (c) a bottle opener (d) a steering wheel
31. 31.Which of these is a wedge? (a) a chisel (b) a nutcracker (c) a flagpole rope wheel (d) a water tap handle
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
33. 33.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
34. 34.Which of these is caused by gravity? (a) a thrown ball comes down (b) brakes stop a bicycle (c) lifting a school bag (d) pedalling a cycle
35. 35.💪 A force is a … (a) kind of colour (b) type of sound (c) push or a pull (d) unit of time
36. 36.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
37. 37.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
38. 38.True or false: a rough doormat gives less friction. (a) False (b) True
39. 39.💪 In a tug of war, one team pulls right with 70 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
40. 40.True or false: a wood screw is a pulley. (a) False (b) True

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