Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 734 · 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.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
2. 2.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
4. 4.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) magnetic force (d) muscular force
5. 5.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
7. 7.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
8. 8.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) wind (d) magnetism
9. 9.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Meena (420 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
12. 12.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
14. 14.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
16. 16.True or false: a wood screw is a lever. (a) False (b) True
17. 17.Which of these is caused by muscular force? (a) rubbing hands warms them (b) shoes grip the floor (c) lifting a school bag (d) rain falls to the ground
18. 18.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) mass of fulcrum (d) time taken
20. 20.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
21. 21.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
22. 22.💪 Which force is at work: squeezing a lemon? (a) friction (b) magnetic force (c) muscular force (d) gravity
23. 23.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
24. 24.True or false: a rough doormat gives more friction. (a) True (b) False
25. 25.True or false: a steering wheel is a wheel and axle. (a) False (b) True
26. 26.🪝 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?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 12 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
32. 32.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crowbar (c) a truck loading ramp (d) a seesaw
33. 33.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
36. 36.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
40. 40.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) second (s) (d) newton (N)

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