Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 801 · 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 seesaw balances. Kabir (110 N) sits ? m from the pivot on one side; Asha (440 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
2. 2.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
3. 3.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.🏋️ A force of 110 N pushes a cart 5 m along the floor. How much work is done, in joules?
5. 5.🏋️ A force of 200 N pushes a cart 5 m along the floor. How much work is done, in joules?
6. 6.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 40 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🔍 Which is the odd one out? (a) a chisel (b) a crowbar (c) an axe blade (d) a knife edge
8. 8.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
9. 9.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) False (b) True
10. 10.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.Which of these is caused by muscular force? (a) pedalling a cycle (b) a compass needle turns (c) rain falls to the ground (d) a thrown ball comes down
12. 12.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.🏋️ A force of 500 N pushes a cart 3 m along the floor. How much work is done, in joules?
14. 14.True or false: opening a drawer is a pull. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
16. 16.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.True or false: pulling a cart is a push. (a) True (b) False
18. 18.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
19. 19.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
20. 20.🏋️ Pushing a crate 4 m took 1040 J of work. What force was used, in newtons?
21. 21.Which of these is a pulley? (a) a wood screw (b) a steering wheel (c) a jar lid (d) a crane hook block
22. 22.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
23. 23.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) brakes stop a bicycle (c) rain falls to the ground (d) an apple falls down
24. 24.⚖️ A seesaw balances. Ravi (390 N) sits 1 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
26. 26.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the load (d) the effort
27. 27.🔍 Which is the odd one out? (a) a bottle opener (b) a nutcracker (c) a claw hammer on a nail (d) a round doorknob
28. 28.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
29. 29.⚖️ A lever bar balances. The load is 450 N at ? cm from the fulcrum. The effort is 100 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
31. 31.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
32. 32.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
33. 33.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
34. 34.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
35. 35.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) sand on a slippery path (d) oil on a squeaky hinge
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) chalk on a gym bar (d) a box pushed on carpet

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