Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 671 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
2. 2.⚖️ 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 1 (c) class 3
3. 3.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
4. 4.True or false: the tip of a nail is a screw. (a) True (b) False
5. 5.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
6. 6.🏋️ 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?
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
8. 8.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wheel on ball bearings (d) skating on ice
10. 10.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
11. 11.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
12. 12.True or false: a nutcracker is a lever. (a) False (b) True
13. 13.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
14. 14.⚙️ Which simple machine is a crowbar? (a) lever (b) pulley (c) screw (d) inclined plane
15. 15.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
16. 16.⚙️ Which simple machine is a well winch handle? (a) wedge (b) screw (c) pulley (d) wheel and axle
17. 17.⚖️ A seesaw balances. Kabir (110 N) sits 3 m from the pivot on one side; Zoya (330 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ 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
19. 19.🔍 Which is the odd one out? (a) a door stopper (b) a knife edge (c) an axe blade (d) a wheelchair ramp
20. 20.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.True or false: a water tap handle is a wheel and axle. (a) False (b) True
23. 23.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
24. 24.💪 A bag has a mass of 59 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
25. 25.🔍 Which is the odd one out? (a) a round doorknob (b) a water tap handle (c) a well winch handle (d) a claw hammer on a nail
26. 26.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
27. 27.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
29. 29.⚙️ Which simple machine is a knife edge? (a) inclined plane (b) lever (c) wedge (d) screw
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a rope on a wheel (d) a wheel on a rod
32. 32.Which of these is a wheel and axle? (a) a screw jack (b) a seesaw (c) a well winch handle (d) a playground slide
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.True or false: skating on ice gives less friction. (a) True (b) False
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.True or false: pulling up your socks is a push. (a) False (b) True
38. 38.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
39. 39.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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