Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 427 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the fulcrum (d) on the rock
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a box pushed on carpet (d) a smooth steel slide
4. 4.True or false: sand on a slippery path gives less friction. (a) True (b) False
5. 5.Which of these is a pulley? (a) a chisel (b) a jar lid (c) a water tap handle (d) a crane hook block
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
7. 7.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (150 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🔍 Which is the odd one out? (a) a seesaw (b) a crane hook block (c) a bottle opener (d) a claw hammer on a nail
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
10. 10.⚖️ A seesaw balances. Zoya (480 N) sits ? m from the pivot on one side; Arjun (320 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
11. 11.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.True or false: a steering wheel is a wheel and axle. (a) False (b) True
13. 13.🏋️ A force of 420 N did 840 J of work. How many metres did the object move?
14. 14.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
15. 15.⚙️ Which simple machine is a door stopper? (a) wheel and axle (b) lever (c) screw (d) wedge
16. 16.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
17. 17.Which of these is a lever? (a) a steering wheel (b) a bottle opener (c) a road up a hill (d) a knife edge
18. 18.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
19. 19.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
22. 22.🏋️ Pushing a crate 5 m took 1700 J of work. What force was used, in newtons?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a rough doormat (d) a smooth steel slide
25. 25.🏋️ A force of 50 N pushes a cart 4 m along the floor. How much work is done, in joules?
26. 26.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
27. 27.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
28. 28.🪝 A pulley system lifts an 810 N load with an effort of 270 N. What is its mechanical advantage (MA)?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.True or false: a fixed pulley stays in one place. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
33. 33.🏋️ A force of 470 N did 470 J of work. How many metres did the object move?
34. 34.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.True or false: a rough doormat gives more friction. (a) False (b) True
37. 37.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
40. 40.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?

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