Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 399 · 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.Which of these is caused by friction? (a) squeezing a lemon (b) a fridge magnet sticks (c) rubbing hands warms them (d) lifting a school bag
2. 2.🏋️ Pushing a crate 7 m took 1750 J of work. What force was used, in newtons?
3. 3.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
5. 5.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Ravi (100 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
8. 8.💪 A bag has a mass of 1 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
10. 10.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) muscular force (d) gravity
12. 12.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
13. 13.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
14. 14.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
15. 15.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (420 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) screw (c) wedge (d) pulley
20. 20.True or false: a fixed pulley only changes direction. (a) False (b) True
21. 21.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
24. 24.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) True (b) False
25. 25.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.True or false: a crane hook block is a pulley. (a) False (b) True
27. 27.⚙️ Which simple machine is a crane hook block? (a) inclined plane (b) wheel and axle (c) screw (d) pulley
28. 28.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
29. 29.True or false: a movable pulley needs effort = load. (a) True (b) False
30. 30.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a box pushed on carpet (d) sand on a slippery path
33. 33.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
35. 35.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.True or false: a rough doormat gives less friction. (a) False (b) True
39. 39.True or false: a grippy rubber sole gives more friction. (a) False (b) True
40. 40.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1

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