Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 311 · 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 a pulley? (a) a truck loading ramp (b) a screw jack (c) a window blind cord (d) a bottle cap
2. 2.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
4. 4.True or false: pushing a trolley is a push. (a) True (b) False
5. 5.⚙️ Which simple machine is an axe blade? (a) inclined plane (b) wedge (c) pulley (d) screw
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) on the pivot (d) closer to the pivot
7. 7.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
8. 8.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
9. 9.🔍 Which is the odd one out? (a) an axe blade (b) a nutcracker (c) a seesaw (d) a claw hammer on a nail
10. 10.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
11. 11.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
12. 12.Which of these is caused by muscular force? (a) a river flows downhill (b) a compass needle turns (c) a fridge magnet sticks (d) pedalling a cycle
13. 13.⚖️ A lever bar balances. The load is 490 N at 10 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?
14. 14.🏋️ Pushing a crate 3 m took 150 J of work. What force was used, in newtons?
15. 15.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
16. 16.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
17. 17.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (200 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) shoes grip the floor (d) a river flows downhill
19. 19.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
21. 21.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
22. 22.True or false: a fixed pulley needs effort = load. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a seesaw (b) a nutcracker (c) the tip of a nail (d) a crowbar
24. 24.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
26. 26.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
27. 27.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
30. 30.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Meena (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
32. 32.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
34. 34.💪 A bag has a mass of 36 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.💪 In a tug of war, one team pulls left with 20 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
36. 36.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
37. 37.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
38. 38.True or false: skating on ice gives more friction. (a) True (b) False
39. 39.⚖️ A seesaw balances. Zoya (220 N) sits 2 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚙️ Which simple machine is a bottle opener? (a) wheel and axle (b) lever (c) pulley (d) wedge

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