Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 815 · 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.🛞 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 carpet 3 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
2. 2.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
4. 4.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
7. 7.🏋️ 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?
8. 8.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.🏋️ Pushing a crate 4 m took 40 J of work. What force was used, in newtons?
10. 10.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) muscular force (c) magnetic force (d) friction
11. 11.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
12. 12.Which of these is a wheel and axle? (a) a crane hook block (b) a round doorknob (c) a jar lid (d) a chisel
13. 13.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 3 (c) class 2
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) skating on ice
17. 17.💪 A cart is pulled to the right with 65 N and to the left with 55 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
18. 18.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
19. 19.True or false: kicking a football is a push. (a) True (b) False
20. 20.⚖️ A seesaw balances. Arjun (330 N) sits 1 m from the pivot on one side; Asha (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
22. 22.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
23. 23.True or false: chalk on a gym bar gives more friction. (a) False (b) True
24. 24.True or false: a smooth steel slide gives more friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a tyre with deep treads (d) a grippy rubber sole
26. 26.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
27. 27.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
28. 28.💪 A box weighs 140 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
30. 30.🔍 Which is the odd one out? (a) a screw jack (b) a wood screw (c) a crane hook block (d) a bottle cap
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
32. 32.True or false: powder on a carrom board gives less friction. (a) False (b) True
33. 33.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) gravity (d) unbalanced
34. 34.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
36. 36.True or false: a water tap handle is a wedge. (a) True (b) False
37. 37.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
39. 39.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
40. 40.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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