Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 371 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
2. 2.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
3. 3.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) chalk on a gym bar (d) a box pushed on carpet
5. 5.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
7. 7.💪 A box weighs 370 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
8. 8.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) less effort needed (d) the load floats
9. 9.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
10. 10.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
12. 12.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.True or false: pulling a cart is a pull. (a) False (b) True
14. 14.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
15. 15.⚖️ A seesaw balances. Ravi (440 N) sits 4 m from the pivot on one side; Arjun (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
17. 17.⚖️ A seesaw balances. Asha (570 N) sits ? m from the pivot on one side; Arjun (190 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
19. 19.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
20. 20.True or false: a tyre with deep treads gives more friction. (a) False (b) True
21. 21.True or false: a claw hammer on a nail is a lever. (a) False (b) True
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
23. 23.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
25. 25.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
26. 26.True or false: skating on ice gives more friction. (a) True (b) False
27. 27.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) wedge (c) lever (d) screw
28. 28.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
31. 31.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
32. 32.True or false: powder on a carrom board gives more friction. (a) False (b) True
33. 33.🏋️ An 18 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.⚙️ Which simple machine is a playground slide? (a) wheel and axle (b) pulley (c) inclined plane (d) wedge
35. 35.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
36. 36.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
39. 39.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
40. 40.True or false: plucking a mango is a push. (a) True (b) False

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