Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 36 · 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.True or false: pulling a cart is a push. (a) True (b) False
2. 2.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
3. 3.💪 A bag has a mass of 37 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
5. 5.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
6. 6.True or false: a jar lid is a screw. (a) False (b) True
7. 7.⚖️ A seesaw balances. Ravi (160 N) sits ? m from the pivot on one side; Arjun (160 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
8. 8.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
9. 9.💪 A cart is pulled to the right with 40 N and to the left with 50 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 15 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🪝 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?
12. 12.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
13. 13.🪝 A load of 440 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
16. 16.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
17. 17.🪝 A pulley system lifts a 150 N load with an effort of 50 N. What is its mechanical advantage (MA)?
18. 18.🔍 Which is the odd one out? (a) a nutcracker (b) a water tap handle (c) a steering wheel (d) a round doorknob
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
20. 20.💪 A force is a … (a) type of sound (b) unit of time (c) kind of colour (d) push or a pull
21. 21.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
22. 22.True or false: powder on a carrom board gives more friction. (a) True (b) False
23. 23.💪 A cart is pulled to the right with 35 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
24. 24.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
25. 25.💪 Two children push a box to the right, one with 45 N and the other with 85 N. What is the net (total) force on the box, in newtons?
26. 26.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
27. 27.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 180 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
29. 29.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
30. 30.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) muscular force (c) friction (d) magnetic force
31. 31.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Arjun (420 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
36. 36.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
38. 38.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
39. 39.💪 A bag has a mass of 57 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
40. 40.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?

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