Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 284 · 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.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
2. 2.True or false: plucking a mango is a push. (a) True (b) False
3. 3.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a crane hook block (b) a seesaw (c) a well-bucket rope wheel (d) a flagpole rope wheel
6. 6.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
7. 7.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
8. 8.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
9. 9.⚖️ A lever bar balances. The load is 210 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
11. 11.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
12. 12.Which of these is a pulley? (a) a crane hook block (b) a seesaw (c) a water tap handle (d) a crowbar
13. 13.🏋️ Pushing a crate 8 m took 4000 J of work. What force was used, in newtons?
14. 14.Which of these is caused by gravity? (a) rubbing hands warms them (b) a thrown ball comes down (c) a magnet picks up pins (d) a fridge magnet sticks
15. 15.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) friction (d) magnetism
16. 16.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
17. 17.🔍 Which is the odd one out? (a) a road up a hill (b) a water tap handle (c) a steering wheel (d) a round doorknob
18. 18.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
19. 19.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
20. 20.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
21. 21.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
22. 22.⚙️ Which simple machine is a crowbar? (a) inclined plane (b) wheel and axle (c) screw (d) lever
23. 23.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 90 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
26. 26.Which of these is caused by muscular force? (a) lifting a school bag (b) a compass needle turns (c) a river flows downhill (d) brakes stop a bicycle
27. 27.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) friction (c) gravity (d) muscular force
28. 28.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
29. 29.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Ravi (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) nothing
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
32. 32.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
34. 34.💪 A cart is pulled to the right with 40 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
35. 35.💪 In a tug of war, one team pulls right with 45 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
36. 36.⚙️ Which simple machine is a bottle opener? (a) pulley (b) wheel and axle (c) lever (d) wedge
37. 37.True or false: a box pushed on carpet gives more friction. (a) False (b) True
38. 38.⚙️ Which simple machine is a seesaw? (a) lever (b) wedge (c) pulley (d) screw
39. 39.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet

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