Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 109 · 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 seesaw balances. Meena (110 N) sits 3 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.🏋️ Pushing a crate 9 m took 2970 J of work. What force was used, in newtons?
3. 3.🏋️ Pushing a crate 8 m took 2240 J of work. What force was used, in newtons?
4. 4.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
5. 5.🏋️ Pushing a crate 3 m took 330 J of work. What force was used, in newtons?
6. 6.🔍 Which is the odd one out? (a) a crowbar (b) a nutcracker (c) a seesaw (d) a well winch handle
7. 7.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
8. 8.True or false: a movable pulley stays in one place. (a) True (b) False
9. 9.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
11. 11.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.💪 A box weighs 140 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
14. 14.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) gravity (d) magnetic force
15. 15.⚖️ A seesaw balances. Arjun (680 N) sits ? m from the pivot on one side; Asha (170 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
19. 19.⚙️ Which simple machine is a bottle opener? (a) screw (b) lever (c) wedge (d) wheel and axle
20. 20.True or false: a smooth steel slide gives less friction. (a) False (b) True
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
23. 23.⚖️ A seesaw balances. Zoya (140 N) sits 2 m from the pivot on one side; Meena (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.Which of these is a screw? (a) a nut and bolt (b) a round doorknob (c) a crowbar (d) a bottle opener
25. 25.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the axle (d) the load
26. 26.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) doubled (d) unbalanced
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) sand on a slippery path
28. 28.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
29. 29.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
30. 30.⚖️ A seesaw balances. Arjun (360 N) sits 4 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🏋️ A force of 490 N did 490 J of work. How many metres did the object move?
32. 32.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.⚖️ A seesaw balances. Ravi (600 N) sits 3 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
36. 36.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a seesaw (d) a playground slide
37. 37.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
39. 39.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
40. 40.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) wind (d) gravity

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