Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 667 · 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.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
3. 3.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
4. 4.Which of these is a wedge? (a) a steering wheel (b) a claw hammer on a nail (c) a bottle cap (d) a chisel
5. 5.True or false: a movable pulley stays in one place. (a) False (b) True
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (320 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.Which of these is caused by friction? (a) rain falls to the ground (b) an apple falls down (c) a magnet picks up pins (d) rubbing hands warms them
9. 9.💪 Which force is at work: rain falls to the ground? (a) gravity (b) magnetic force (c) friction (d) muscular force
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
12. 12.⚖️ A lever bar balances. The load is 810 N at ? cm from the fulcrum. The effort is 270 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.True or false: skating on ice gives less friction. (a) False (b) True
14. 14.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
15. 15.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the colour of rope (d) the size of the load
16. 16.⚙️ Which simple machine is a window blind cord? (a) lever (b) screw (c) inclined plane (d) pulley
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a water tap handle (d) a truck loading ramp
19. 19.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
20. 20.Which of these is caused by muscular force? (a) a river flows downhill (b) squeezing a lemon (c) brakes stop a bicycle (d) a magnet picks up pins
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) unbalanced (d) doubled
22. 22.⚙️ Which simple machine is a water tap handle? (a) screw (b) pulley (c) lever (d) wheel and axle
23. 23.🏋️ Pushing a crate 2 m took 540 J of work. What force was used, in newtons?
24. 24.⚙️ Which simple machine is a flagpole rope wheel? (a) screw (b) inclined plane (c) wedge (d) pulley
25. 25.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) gravity (c) friction (d) muscular force
26. 26.True or false: a smooth steel slide gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a flagpole rope wheel (d) a round doorknob
28. 28.True or false: a round doorknob is a wheel and axle. (a) False (b) True
29. 29.🏋️ A force of 70 N pushes a cart 6 m along the floor. How much work is done, in joules?
30. 30.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
32. 32.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
35. 35.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
36. 36.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
37. 37.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
38. 38.🏋️ Pushing a crate 3 m took 840 J of work. What force was used, in newtons?
39. 39.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Kabir (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚙️ Which simple machine is a wood screw? (a) pulley (b) inclined plane (c) screw (d) wheel and axle

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