Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 721 · 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.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
2. 2.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
5. 5.Which of these is a wheel and axle? (a) a window blind cord (b) a well winch handle (c) a well-bucket rope wheel (d) a wood screw
6. 6.💪 Which force is at work: pedalling a cycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
7. 7.⚖️ A seesaw balances. Arjun (100 N) sits 1 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.⚖️ A seesaw balances. Arjun (400 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
11. 11.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
12. 12.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
13. 13.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
14. 14.⚖️ A seesaw balances. Arjun (220 N) sits 2 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
18. 18.True or false: pressing a doorbell is a push. (a) True (b) False
19. 19.Which of these is a wedge? (a) a bottle opener (b) a steering wheel (c) a nut and bolt (d) a knife edge
20. 20.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.Which of these is a pulley? (a) a playground slide (b) a seesaw (c) a crane hook block (d) a truck loading ramp
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.True or false: a water tap handle is a pulley. (a) False (b) True
25. 25.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
26. 26.True or false: sand on a slippery path gives less friction. (a) True (b) False
27. 27.Which of these is caused by friction? (a) rubbing hands warms them (b) a thrown ball comes down (c) an apple falls down (d) rain falls to the ground
28. 28.🔍 Which is the odd one out? (a) a water tap handle (b) a well winch handle (c) a round doorknob (d) a flagpole rope wheel
29. 29.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 200 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.Which of these is a wheel and axle? (a) a flagpole rope wheel (b) a water tap handle (c) a bottle cap (d) a window blind cord
33. 33.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
34. 34.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 120 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
37. 37.💪 A cart is pulled to the right with 70 N and to the left with 70 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
39. 39.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
40. 40.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1

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