Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 274 · 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.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
2. 2.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
3. 3.True or false: a fixed pulley needs effort = load. (a) False (b) True
4. 4.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
5. 5.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
7. 7.⚖️ A lever bar balances. The load is 810 N at ? cm from the fulcrum. The effort is 450 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.True or false: a rough doormat gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
10. 10.💪 A cart is pulled to the right with 60 N and to the left with 50 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
11. 11.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
12. 12.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
13. 13.True or false: a wet tiled floor gives less friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
15. 15.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 60 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.True or false: a fixed pulley stays in one place. (a) False (b) True
17. 17.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 200 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
19. 19.🏋️ Pushing a crate 6 m took 2940 J of work. What force was used, in newtons?
20. 20.⚖️ A lever bar balances. The load is 900 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.Which of these is a lever? (a) a jar lid (b) a chisel (c) a flagpole rope wheel (d) a bottle opener
22. 22.🪝 A pulley system lifts a 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
23. 23.⚖️ A seesaw balances. Ravi (570 N) sits 1 m from the pivot on one side; Zoya (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
25. 25.Which of these is a lever? (a) a water tap handle (b) a well winch handle (c) a seesaw (d) a chisel
26. 26.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) a river flows downhill (c) squeezing a lemon (d) a compass needle turns
27. 27.⚖️ A lever bar balances. The load is 560 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
29. 29.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
30. 30.🏋️ A force of 330 N pushes a cart 8 m along the floor. How much work is done, in joules?
31. 31.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) muscular force (d) magnetic force
33. 33.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
35. 35.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
36. 36.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
37. 37.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
38. 38.⚖️ A seesaw balances. Ravi (340 N) sits 1 m from the pivot on one side; Zoya (170 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (170 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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