Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 27 · 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: a screw jack is a wheel and axle. (a) False (b) True
2. 2.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
3. 3.🪝 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
4. 4.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) second (s) (d) metre (m)
5. 5.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
6. 6.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
8. 8.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
9. 9.🏋️ Pushing a crate 4 m took 1880 J of work. What force was used, in newtons?
10. 10.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.💪 A cart is pulled to the right with 85 N and to the left with 100 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
14. 14.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Kabir (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
17. 17.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) sand on a slippery path (d) a box pushed on carpet
18. 18.True or false: a knife edge is a lever. (a) False (b) True
19. 19.🏋️ A force of 400 N did 400 J of work. How many metres did the object move?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.💪 A bag has a mass of 29 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.True or false: a door stopper is a wedge. (a) False (b) True
23. 23.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
24. 24.True or false: a box pushed on carpet gives more friction. (a) False (b) True
25. 25.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.True or false: powder on a carrom board gives more friction. (a) False (b) True
28. 28.🏋️ Pushing a crate 2 m took 520 J of work. What force was used, in newtons?
29. 29.🪝 A pulley system lifts an 840 N load with an effort of 210 N. What is its mechanical advantage (MA)?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) a rolling ball slows (d) squeezing a lemon
32. 32.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
33. 33.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
35. 35.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
36. 36.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
38. 38.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
39. 39.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ 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

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