Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 273 · 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.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the effort (d) the fulcrum
2. 2.⚖️ A lever bar balances. The load is 40 N at 40 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 A box weighs 360 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
4. 4.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) unbalanced (d) doubled
5. 5.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)
6. 6.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
8. 8.🏋️ A force of 330 N pushes a cart 4 m along the floor. How much work is done, in joules?
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a box pushed on carpet (d) a grippy rubber sole
10. 10.🪝 A pulley system lifts a 240 N load with an effort of 60 N. What is its mechanical advantage (MA)?
11. 11.⚖️ A lever bar balances. The load is 50 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
14. 14.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
15. 15.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
16. 16.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
19. 19.⚖️ A lever bar balances. The load is 350 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
21. 21.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
22. 22.True or false: a movable pulley halves the effort. (a) False (b) True
23. 23.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
24. 24.Which of these is caused by friction? (a) rain falls to the ground (b) an apple falls down (c) a rolling ball slows (d) lifting a school bag
25. 25.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
26. 26.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
27. 27.True or false: a movable pulley only changes direction. (a) True (b) False
28. 28.🏋️ Pushing a crate 4 m took 1000 J of work. What force was used, in newtons?
29. 29.🔍 Which is the odd one out? (a) a knife edge (b) a chisel (c) a road up a hill (d) a door stopper
30. 30.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
32. 32.True or false: a movable pulley needs effort = load. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
34. 34.⚖️ A seesaw balances. Meena (220 N) sits ? m from the pivot on one side; Arjun (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
35. 35.⚙️ Which simple machine is a screw jack? (a) screw (b) pulley (c) wheel and axle (d) lever
36. 36.⚖️ A seesaw balances. Kabir (190 N) sits ? m from the pivot on one side; Asha (760 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
37. 37.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
38. 38.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
39. 39.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.⚖️ A seesaw balances. Asha (280 N) sits 3 m from the pivot on one side; Arjun (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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