Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 372 · 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 caused by friction? (a) brakes stop a bicycle (b) squeezing a lemon (c) pedalling a cycle (d) an apple falls down
2. 2.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
3. 3.🛞 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 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
4. 4.⚖️ A lever bar balances. The load is 100 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Asha (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.True or false: a tyre with deep treads gives less friction. (a) True (b) False
9. 9.⚙️ Which simple machine is a road up a hill? (a) lever (b) wedge (c) inclined plane (d) pulley
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
13. 13.True or false: a box pushed on carpet gives more friction. (a) False (b) True
14. 14.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
15. 15.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
16. 16.🏋️ A force of 150 N pushes a cart 5 m along the floor. How much work is done, in joules?
17. 17.⚖️ A lever bar balances. The load is 80 N at 20 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?
18. 18.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) rain falls to the ground (c) an apple falls down (d) a fridge magnet sticks
19. 19.True or false: drawing up a well bucket is a pull. (a) True (b) False
20. 20.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
21. 21.Which of these is a screw? (a) a flagpole rope wheel (b) a wood screw (c) a crowbar (d) a nutcracker
22. 22.⚖️ 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
23. 23.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
24. 24.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
25. 25.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a flat ramp (d) a sharp wedge
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) friction (c) magnetic force (d) gravity
29. 29.⚖️ A lever bar balances. The load is 50 N at 50 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.Which of these is a wheel and axle? (a) a round doorknob (b) a window blind cord (c) a jar lid (d) a claw hammer on a nail
31. 31.True or false: a movable pulley needs effort = load. (a) True (b) False
32. 32.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
33. 33.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) magnetic force (c) friction (d) muscular force
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
36. 36.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
37. 37.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a rope on a wheel (d) a wheel on a rod
38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
39. 39.⚙️ Which simple machine is a wheelchair ramp? (a) screw (b) wedge (c) wheel and axle (d) inclined plane
40. 40.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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