Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 745 · 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.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
2. 2.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
3. 3.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
4. 4.🏋️ A force of 410 N pushes a cart 7 m along the floor. How much work is done, in joules?
5. 5.True or false: powder on a carrom board gives less friction. (a) False (b) True
6. 6.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
7. 7.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
8. 8.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) True (b) False
9. 9.Which of these is a lever? (a) a well-bucket rope wheel (b) a bottle opener (c) the tip of a nail (d) a truck loading ramp
10. 10.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Meena (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.True or false: a movable pulley halves the effort. (a) True (b) False
12. 12.⚙️ Which simple machine is an axe blade? (a) screw (b) wedge (c) lever (d) inclined plane
13. 13.⚖️ A seesaw balances. Ravi (280 N) sits 2 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.💪 Which force is at work: squeezing a lemon? (a) friction (b) gravity (c) magnetic force (d) muscular force
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
16. 16.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) friction (c) gravity (d) magnetic force
17. 17.⚙️ Which simple machine is a door stopper? (a) screw (b) wheel and axle (c) wedge (d) lever
18. 18.True or false: a rough doormat gives less friction. (a) True (b) False
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
20. 20.⚖️ A seesaw balances. Arjun (390 N) sits 4 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
22. 22.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
23. 23.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
24. 24.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
26. 26.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.Which of these is caused by friction? (a) an apple falls down (b) a thrown ball comes down (c) lifting a school bag (d) brakes stop a bicycle
29. 29.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 140 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🏋️ A force of 410 N pushes a cart 4 m along the floor. How much work is done, in joules?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
33. 33.🪝 A load of 840 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
34. 34.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
35. 35.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
36. 36.True or false: a fixed pulley stays in one place. (a) False (b) True
37. 37.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🏋️ A force of 470 N did 940 J of work. How many metres did the object move?
39. 39.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
40. 40.True or false: a door stopper is a lever. (a) False (b) True

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