Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 254 · 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 of these is an inclined plane? (a) a playground slide (b) a nut and bolt (c) a flagpole rope wheel (d) a seesaw
2. 2.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) gravity (d) friction
3. 3.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
5. 5.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
7. 7.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.True or false: hitting a cricket ball is a push. (a) False (b) True
9. 9.Which of these is caused by friction? (a) a fridge magnet sticks (b) an apple falls down (c) a river flows downhill (d) a rolling ball slows
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 2 (b) class 3 (c) class 1
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
12. 12.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
13. 13.💪 Two children push a box to the right, one with 40 N and the other with 30 N. What is the net (total) force on the box, in newtons?
14. 14.True or false: pushing a trolley is a pull. (a) True (b) False
15. 15.⚖️ A seesaw balances. Zoya (220 N) sits 4 m from the pivot on one side; Ravi (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
17. 17.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) far from the fulcrum (d) on the fulcrum
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a grippy rubber sole
19. 19.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) second (s) (d) newton (N)
20. 20.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
21. 21.🏋️ Pushing a crate 7 m took 2030 J of work. What force was used, in newtons?
22. 22.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
25. 25.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
26. 26.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
27. 27.Which of these is a pulley? (a) a nut and bolt (b) a flagpole rope wheel (c) a well winch handle (d) a wood screw
28. 28.True or false: a door stopper is an inclined plane. (a) True (b) False
29. 29.True or false: a grippy rubber sole gives more friction. (a) False (b) True
30. 30.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
31. 31.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
32. 32.🔍 Which is the odd one out? (a) a steering wheel (b) a round doorknob (c) a water tap handle (d) a wheelchair ramp
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
35. 35.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
36. 36.⚖️ A seesaw balances. Kabir (340 N) sits 4 m from the pivot on one side; Ravi (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) friction (c) gravity (d) muscular force
38. 38.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
39. 39.⚖️ A lever bar balances. The load is 80 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.True or false: a seesaw is a lever. (a) True (b) False

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