Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 474 · 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 which unit do we measure force? (a) metre (m) (b) second (s) (c) newton (N) (d) litre (L)
2. 2.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
3. 3.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) switch off gravity (d) make new energy
4. 4.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) nothing
5. 5.🔍 Which is the odd one out? (a) a road up a hill (b) a truck loading ramp (c) a wheelchair ramp (d) a crane hook block
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
7. 7.True or false: a playground slide is an inclined plane. (a) False (b) True
8. 8.True or false: a movable pulley only changes direction. (a) False (b) True
9. 9.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
10. 10.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) False (b) True
11. 11.💪 A box weighs 220 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
14. 14.🏋️ A force of 370 N pushes a cart 4 m along the floor. How much work is done, in joules?
15. 15.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
16. 16.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
17. 17.💪 Two children push a box to the right, one with 55 N and the other with 75 N. What is the net (total) force on the box, in newtons?
18. 18.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
19. 19.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
20. 20.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.⚖️ A seesaw balances. Kabir (360 N) sits 2 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.True or false: opening a drawer is a pull. (a) True (b) False
23. 23.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
24. 24.⚖️ 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 3 (b) class 2 (c) class 1
25. 25.⚙️ Which simple machine is a playground slide? (a) lever (b) wheel and axle (c) inclined plane (d) wedge
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.True or false: a round doorknob is a wheel and axle. (a) True (b) False
28. 28.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
29. 29.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a crane hook block (c) a truck loading ramp (d) a window blind cord
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) gravity (c) muscular force (d) friction
35. 35.True or false: a fixed pulley only changes direction. (a) True (b) False
36. 36.⚖️ A seesaw balances. Asha (520 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
38. 38.True or false: pressing a doorbell is a push. (a) False (b) True
39. 39.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
40. 40.💪 Which force is at work: a compass needle turns? (a) gravity (b) friction (c) muscular force (d) magnetic force

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