Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 496 · 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 well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
2. 2.💪 Which force is at work: a compass needle turns? (a) muscular force (b) friction (c) gravity (d) magnetic force
3. 3.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
4. 4.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
5. 5.🏋️ A force of 10 N did 20 J of work. How many metres did the object move?
6. 6.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 20 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
8. 8.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
9. 9.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
10. 10.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 90 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚖️ A seesaw balances. Asha (160 N) sits 3 m from the pivot on one side; Kabir (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.True or false: a seesaw is a lever. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.True or false: plucking a mango is a pull. (a) True (b) False
16. 16.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
17. 17.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
18. 18.Which of these is an inclined plane? (a) a window blind cord (b) a well winch handle (c) a crowbar (d) a wheelchair ramp
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
20. 20.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
21. 21.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
22. 22.True or false: a movable pulley rises with the load. (a) False (b) True
23. 23.🪝 A bucket weighing 310 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
25. 25.Which of these is an inclined plane? (a) a crowbar (b) a road up a hill (c) a door stopper (d) a steering wheel
26. 26.⚖️ A seesaw balances. Meena (190 N) sits ? m from the pivot on one side; Kabir (380 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
27. 27.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
28. 28.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the axle (d) the effort
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.⚖️ A seesaw balances. Meena (200 N) sits ? m from the pivot on one side; Kabir (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
31. 31.🪝 A load of 80 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
33. 33.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) pulley (c) screw (d) inclined plane
35. 35.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
36. 36.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Arjun (150 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.Which of these is an inclined plane? (a) a truck loading ramp (b) a well winch handle (c) a steering wheel (d) a claw hammer on a nail
38. 38.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
40. 40.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match

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