Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 117 · 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 pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
2. 2.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
3. 3.⚖️ A seesaw balances. Ravi (570 N) sits ? m from the pivot on one side; Meena (380 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
5. 5.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
6. 6.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
8. 8.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
9. 9.True or false: pushing a trolley is a push. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
12. 12.💪 Which force pulls everything towards the Earth? (a) gravity (b) wind (c) friction (d) magnetism
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
14. 14.💪 A force is a … (a) unit of time (b) push or a pull (c) type of sound (d) kind of colour
15. 15.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
16. 16.⚖️ A lever bar balances. The load is 160 N at 30 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?
17. 17.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
18. 18.💪 Two children push a box to the right, one with 45 N and the other with 25 N. What is the net (total) force on the box, in newtons?
19. 19.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
20. 20.💪 A box weighs 40 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.Which of these is caused by friction? (a) pedalling a cycle (b) a rolling ball slows (c) rain falls to the ground (d) a river flows downhill
22. 22.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
23. 23.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
24. 24.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
25. 25.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
26. 26.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a tiny pulley (d) a ramp wrapped round
27. 27.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
31. 31.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
33. 33.Which of these is caused by gravity? (a) rubbing hands warms them (b) a fridge magnet sticks (c) shoes grip the floor (d) a thrown ball comes down
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
36. 36.Which of these is a pulley? (a) the tip of a nail (b) a wood screw (c) a well-bucket rope wheel (d) a knife edge
37. 37.🔍 Which is the odd one out? (a) a screw jack (b) a bottle cap (c) a nutcracker (d) a jar lid
38. 38.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
39. 39.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change

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