Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 429 · 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.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 30 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
3. 3.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
4. 4.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
5. 5.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a well-bucket rope wheel (d) a round doorknob
6. 6.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a road up a hill (b) a steering wheel (c) a wheelchair ramp (d) a playground slide
8. 8.⚙️ Which simple machine is a bottle opener? (a) lever (b) pulley (c) screw (d) inclined plane
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
10. 10.💪 Which force is at work: squeezing a lemon? (a) friction (b) muscular force (c) gravity (d) magnetic force
11. 11.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.True or false: a fixed pulley needs effort = load. (a) True (b) False
14. 14.⚖️ A seesaw balances. Arjun (440 N) sits 3 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🏋️ A force of 440 N did 880 J of work. How many metres did the object move?
16. 16.⚖️ A seesaw balances. Meena (200 N) sits 4 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
18. 18.⚖️ A seesaw balances. Zoya (160 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚙️ Which simple machine is a door stopper? (a) screw (b) inclined plane (c) wedge (d) lever
20. 20.True or false: a chisel is a wedge. (a) False (b) True
21. 21.Which of these is caused by magnetic force? (a) a river flows downhill (b) squeezing a lemon (c) a magnet picks up pins (d) shoes grip the floor
22. 22.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
23. 23.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
24. 24.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.⚖️ A seesaw balances. Asha (190 N) sits 2 m from the pivot on one side; Arjun (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.True or false: a road up a hill is an inclined plane. (a) True (b) False
28. 28.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
29. 29.Which of these is an inclined plane? (a) a window blind cord (b) a playground slide (c) a crowbar (d) a chisel
30. 30.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
31. 31.🪝 A pulley system lifts a 720 N load with an effort of 180 N. What is its mechanical advantage (MA)?
32. 32.True or false: a beam balance is a class 2 lever (load in the middle). (a) False (b) True
33. 33.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) stop all friction (d) switch off gravity
34. 34.True or false: hitting a cricket ball is a pull. (a) False (b) True
35. 35.⚖️ A seesaw balances. Asha (340 N) sits 4 m from the pivot on one side; Ravi (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
37. 37.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
39. 39.Which of these is caused by friction? (a) a fridge magnet sticks (b) a thrown ball comes down (c) a magnet picks up pins (d) a rolling ball slows
40. 40.⚖️ A lever bar balances. The load is 420 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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