Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 632 · 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 10 cm, the fulcrum at 50 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
2. 2.Which of these is an inclined plane? (a) a steering wheel (b) a screw jack (c) a road up a hill (d) a well-bucket rope wheel
3. 3.🏋️ A force of 320 N did 2240 J of work. How many metres did the object move?
4. 4.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) magnetism (d) gravity
5. 5.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
6. 6.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
8. 8.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
9. 9.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
10. 10.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
14. 14.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
16. 16.True or false: a movable pulley is on a flagpole top. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
18. 18.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Meena (760 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ A seesaw balances. Ravi (640 N) sits 2 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wet tiled floor (d) a wheel on ball bearings
21. 21.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
22. 22.True or false: kicking a football is a push. (a) True (b) False
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🔍 Which is the odd one out? (a) a bottle opener (b) a nutcracker (c) a crowbar (d) a round doorknob
26. 26.⚖️ A seesaw balances. Arjun (330 N) sits ? m from the pivot on one side; Zoya (110 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.💪 A cart is pulled to the right with 60 N and to the left with 55 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
31. 31.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the effort (d) the fulcrum
32. 32.True or false: sand on a slippery path gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
34. 34.🪝 A load of 690 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
35. 35.⚙️ Which simple machine is a bottle opener? (a) wedge (b) wheel and axle (c) screw (d) lever
36. 36.True or false: a box pushed on carpet gives more friction. (a) False (b) True
37. 37.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
38. 38.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.🪝 A well winch has a handle (wheel) of radius 5 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
40. 40.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?

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