Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 681 · 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.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) doubled (d) unbalanced
2. 2.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
3. 3.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) stop all friction (d) switch off gravity
4. 4.⚖️ A lever bar balances. The load is 40 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.Which of these is a wheel and axle? (a) a crane hook block (b) a round doorknob (c) a flagpole rope wheel (d) a crowbar
6. 6.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
7. 7.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
8. 8.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
10. 10.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) gravity (c) friction (d) muscular force
11. 11.⚖️ A seesaw balances. Meena (140 N) sits 1 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
13. 13.True or false: pushing a trolley is a push. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a screw jack (b) a playground slide (c) a wood screw (d) a jar lid
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
16. 16.💪 A bag has a mass of 55 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
18. 18.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
20. 20.🔍 Which is the odd one out? (a) a door stopper (b) a chisel (c) a knife edge (d) a jar lid
21. 21.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
22. 22.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a box pushed on carpet (d) chalk on a gym bar
23. 23.True or false: a grippy rubber sole gives less friction. (a) True (b) False
24. 24.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (200 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.True or false: a box pushed on carpet gives more friction. (a) False (b) True
27. 27.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 300 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
29. 29.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.True or false: pulling up your socks is a push. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
36. 36.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (150 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.Which of these is a lever? (a) a chisel (b) a window blind cord (c) a bottle opener (d) a screw jack
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the effort (d) the load
40. 40.True or false: a movable pulley is on a flagpole top. (a) True (b) False

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