Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 151 · 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 pliers? (a) class 2 (b) class 3 (c) class 1
2. 2.True or false: a crane hook block is a screw. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a bottle opener (b) a water tap handle (c) a claw hammer on a nail (d) a nutcracker
4. 4.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a chisel (d) a round doorknob
5. 5.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 70 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
7. 7.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) screw (c) wedge (d) wheel and axle
8. 8.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
9. 9.⚙️ Which simple machine is a crowbar? (a) screw (b) wedge (c) pulley (d) lever
10. 10.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
11. 11.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 300 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.Which of these is a screw? (a) a water tap handle (b) a chisel (c) a steering wheel (d) a wood screw
13. 13.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
14. 14.True or false: pushing a swing is a pull. (a) False (b) True
15. 15.True or false: a grippy rubber sole gives more friction. (a) False (b) True
16. 16.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
17. 17.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
18. 18.💪 A bag has a mass of 12 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.⚖️ A lever bar balances. The load is 630 N at 50 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a tyre with deep treads (d) oil on a squeaky hinge
23. 23.🔍 Which is the odd one out? (a) a well winch handle (b) a window blind cord (c) a water tap handle (d) a steering wheel
24. 24.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
25. 25.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
26. 26.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
27. 27.True or false: a wet tiled floor gives less friction. (a) False (b) True
28. 28.Which of these is a wedge? (a) a water tap handle (b) a screw jack (c) the tip of a nail (d) a bottle cap
29. 29.Which of these is caused by muscular force? (a) a thrown ball comes down (b) lifting a school bag (c) brakes stop a bicycle (d) a river flows downhill
30. 30.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
31. 31.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.⚖️ A seesaw balances. Asha (400 N) sits ? m from the pivot on one side; Kabir (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
35. 35.🏋️ A force of 360 N pushes a cart 1 m along the floor. How much work is done, in joules?
36. 36.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
37. 37.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
38. 38.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) gravity (c) muscular force (d) friction
39. 39.⚙️ Which simple machine is the tip of a nail? (a) screw (b) wedge (c) lever (d) wheel and axle
40. 40.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) wind (d) gravity

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