Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 269 · 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 pair of scissors? (a) class 1 (b) class 3 (c) class 2
2. 2.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
3. 3.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
4. 4.🔍 Which is the odd one out? (a) a round doorknob (b) a knife edge (c) a water tap handle (d) a steering wheel
5. 5.⚖️ A seesaw balances. Arjun (260 N) sits 3 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.Which of these is a wheel and axle? (a) a well winch handle (b) a bottle opener (c) a claw hammer on a nail (d) a well-bucket rope wheel
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 100 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
8. 8.⚙️ Which simple machine is a chisel? (a) lever (b) wheel and axle (c) pulley (d) wedge
9. 9.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
10. 10.Which of these is caused by gravity? (a) brakes stop a bicycle (b) pedalling a cycle (c) squeezing a lemon (d) a thrown ball comes down
11. 11.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (240 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
13. 13.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
14. 14.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
16. 16.True or false: a fixed pulley needs effort = load. (a) True (b) False
17. 17.True or false: a wet tiled floor gives more friction. (a) False (b) True
18. 18.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) muscular force (c) friction (d) gravity
19. 19.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
20. 20.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
22. 22.True or false: a crane hook block is a pulley. (a) False (b) True
23. 23.True or false: closing a drawer is a pull. (a) True (b) False
24. 24.💪 A box weighs 500 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
26. 26.True or false: a window blind cord is a screw. (a) True (b) False
27. 27.🏋️ 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?
28. 28.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
29. 29.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) an apple falls down (c) a river flows downhill (d) a fridge magnet sticks
30. 30.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Arjun (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
32. 32.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
33. 33.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
35. 35.True or false: a window blind cord is a wedge. (a) False (b) True
36. 36.⚖️ A lever bar balances. The load is 120 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) magnetic force (c) friction (d) gravity
38. 38.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.⚖️ A lever bar balances. The load is 400 N at 50 cm from the fulcrum. The effort is 500 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.🏋️ A force of 70 N pushes a cart 9 m along the floor. How much work is done, in joules?

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