Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 613 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
3. 3.True or false: a movable pulley is on a flagpole top. (a) False (b) True
4. 4.💪 A cart is pulled to the right with 20 N and to the left with 5 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
5. 5.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
6. 6.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Zoya (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.Which of these is an inclined plane? (a) a flagpole rope wheel (b) a door stopper (c) a seesaw (d) a playground slide
8. 8.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 20 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 40 N bucket on the axle, in newtons? (ideal)
12. 12.True or false: pushing a trolley is a pull. (a) True (b) False
13. 13.🏋️ A force of 440 N did 440 J of work. How many metres did the object move?
14. 14.💪 A bag has a mass of 60 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
16. 16.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
17. 17.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) pedalling a cycle (c) a thrown ball comes down (d) a fridge magnet sticks
18. 18.True or false: a fixed pulley stays in one place. (a) True (b) False
19. 19.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
20. 20.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
21. 21.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
22. 22.🏋️ A force of 300 N pushes a cart 2 m along the floor. How much work is done, in joules?
23. 23.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
24. 24.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) stop it moving (d) change its colour
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a wheel on ball bearings (d) oil on a squeaky hinge
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
28. 28.🏋️ A force of 240 N did 1680 J of work. How many metres did the object move?
29. 29.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
30. 30.🔍 Which is the odd one out? (a) a bottle opener (b) a seesaw (c) a nutcracker (d) a round doorknob
31. 31.🏋️ A force of 470 N did 1410 J of work. How many metres did the object move?
32. 32.🏋️ Pushing a crate 4 m took 1240 J of work. What force was used, in newtons?
33. 33.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
34. 34.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
35. 35.Which of these is a lever? (a) a wood screw (b) a jar lid (c) a round doorknob (d) a bottle opener
36. 36.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
37. 37.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.Which of these is caused by friction? (a) a thrown ball comes down (b) rain falls to the ground (c) brakes stop a bicycle (d) a magnet picks up pins
39. 39.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the axle
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere

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