Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 978 · 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 which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
2. 2.🔍 Which is the odd one out? (a) a nutcracker (b) a seesaw (c) a claw hammer on a nail (d) a bottle cap
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
5. 5.True or false: a rough doormat gives less friction. (a) False (b) True
6. 6.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
7. 7.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
8. 8.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) friction (d) magnetic force
9. 9.True or false: hitting a cricket ball is a push. (a) True (b) False
10. 10.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) True (b) False
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) on the pivot (d) closer to the pivot
12. 12.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
13. 13.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
14. 14.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
15. 15.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
16. 16.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
17. 17.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
18. 18.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
19. 19.⚖️ A seesaw balances. Meena (720 N) sits 1 m from the pivot on one side; Arjun (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
20. 20.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
21. 21.🏋️ Pushing a crate 5 m took 750 J of work. What force was used, in newtons?
22. 22.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 10 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.True or false: a bottle cap is an inclined plane. (a) False (b) True
24. 24.Which of these is caused by friction? (a) squeezing a lemon (b) a compass needle turns (c) brakes stop a bicycle (d) pedalling a cycle
25. 25.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
26. 26.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
27. 27.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
28. 28.⚖️ A lever bar balances. The load is 400 N at 10 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🔍 Which is the odd one out? (a) a nutcracker (b) a claw hammer on a nail (c) a truck loading ramp (d) a crowbar
30. 30.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
31. 31.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
32. 32.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
34. 34.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) muscular force (d) gravity
35. 35.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) muscular force (c) gravity (d) magnetic force
36. 36.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 35 N. What is the size of the net force, in newtons?
37. 37.True or false: a movable pulley is on a flagpole top. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.Which of these is caused by muscular force? (a) squeezing a lemon (b) brakes stop a bicycle (c) a fridge magnet sticks (d) rubbing hands warms them
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank

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