Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 124 · 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.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
2. 2.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
3. 3.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 60 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.True or false: a seesaw is a lever. (a) False (b) True
6. 6.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
7. 7.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
8. 8.🔍 Which is the odd one out? (a) a steering wheel (b) a playground slide (c) a well winch handle (d) a round doorknob
9. 9.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
10. 10.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
11. 11.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
12. 12.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
14. 14.💪 A cart is pulled to the right with 40 N and to the left with 25 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
15. 15.💪 A cart is pulled to the right with 100 N and to the left with 100 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
16. 16.True or false: a tyre with deep treads gives less friction. (a) False (b) True
17. 17.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
18. 18.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
19. 19.Which of these is a screw? (a) a knife edge (b) a truck loading ramp (c) a wood screw (d) a steering wheel
20. 20.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Meena (240 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a nutcracker (b) a wheelchair ramp (c) a bottle opener (d) a seesaw
23. 23.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
24. 24.💪 Which force is at work: a river flows downhill? (a) muscular force (b) gravity (c) magnetic force (d) friction
25. 25.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
26. 26.🏋️ A force of 380 N pushes a cart 7 m along the floor. How much work is done, in joules?
27. 27.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
28. 28.⚖️ A seesaw balances. Arjun (640 N) sits ? m from the pivot on one side; Asha (160 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
29. 29.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
30. 30.🪝 A bucket weighing 320 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.🏋️ A force of 350 N pushes a cart 8 m along the floor. How much work is done, in joules?
32. 32.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
33. 33.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) screw (c) inclined plane (d) pulley
36. 36.True or false: a crane hook block is a pulley. (a) True (b) False
37. 37.True or false: a movable pulley needs effort = load. (a) False (b) True
38. 38.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
39. 39.True or false: kicking a football is a push. (a) True (b) False
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

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