Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 793 · 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 winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
2. 2.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is 140 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🏋️ A force of 180 N did 360 J of work. How many metres did the object move?
4. 4.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
6. 6.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
7. 7.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
8. 8.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?
9. 9.True or false: a movable pulley needs effort = load. (a) False (b) True
10. 10.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
11. 11.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) inclined plane (c) lever (d) pulley
12. 12.💪 A force is a … (a) unit of time (b) type of sound (c) kind of colour (d) push or a pull
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
16. 16.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) gravity (d) friction
17. 17.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
18. 18.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
19. 19.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
20. 20.🏋️ A force of 80 N did 480 J of work. How many metres did the object move?
21. 21.🏋️ A force of 320 N did 960 J of work. How many metres did the object move?
22. 22.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
23. 23.⚙️ Which simple machine is a crane hook block? (a) pulley (b) screw (c) wedge (d) inclined plane
24. 24.⚖️ A lever bar balances. The load is 200 N at 40 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 360 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.True or false: a road up a hill is a wedge. (a) True (b) False
29. 29.💪 A bag has a mass of 23 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.True or false: a movable pulley halves the effort. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
32. 32.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
33. 33.💪 In a tug of war, one team pulls right with 55 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
34. 34.🔍 Which is the odd one out? (a) a truck loading ramp (b) a wheelchair ramp (c) a door stopper (d) a road up a hill
35. 35.True or false: a crowbar is an inclined plane. (a) False (b) True
36. 36.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
39. 39.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Kabir (390 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?

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