Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 542 · 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.True or false: a fixed pulley needs effort = load. (a) False (b) True
2. 2.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.🪝 A pulley system lifts a 330 N load with an effort of 110 N. What is its mechanical advantage (MA)?
5. 5.🔍 Which is the odd one out? (a) a crowbar (b) a seesaw (c) a crane hook block (d) a nutcracker
6. 6.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) sand on a slippery path (d) a smooth steel slide
7. 7.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
9. 9.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a ramp wrapped round (d) a bent lever
10. 10.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
11. 11.⚖️ A seesaw balances. Asha (520 N) sits 2 m from the pivot on one side; Meena (260 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
13. 13.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.True or false: a fixed pulley only changes direction. (a) False (b) True
16. 16.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
17. 17.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
18. 18.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
19. 19.🏋️ A force of 90 N did 900 J of work. How many metres did the object move?
20. 20.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
22. 22.True or false: a round doorknob is a wheel and axle. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
24. 24.⚙️ Which simple machine is a wheelchair ramp? (a) screw (b) wheel and axle (c) inclined plane (d) pulley
25. 25.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
27. 27.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Arjun (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
29. 29.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
30. 30.⚖️ A lever bar balances. The load is 500 N at ? cm from the fulcrum. The effort is 500 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.True or false: powder on a carrom board gives less friction. (a) False (b) True
34. 34.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.⚖️ A seesaw balances. Arjun (200 N) sits 2 m from the pivot on one side; Meena (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) second (s) (d) metre (m)
37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
38. 38.True or false: a movable pulley halves the effort. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a truck loading ramp (b) a playground slide (c) a road up a hill (d) a well winch handle
40. 40.🪝 A bucket weighing 290 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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