Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 179 · 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.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
2. 2.💪 A cart is pulled to the right with 90 N and to the left with 95 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
3. 3.True or false: a knife edge is a wedge. (a) True (b) False
4. 4.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) muscular force (d) gravity
5. 5.🪝 A pulley system lifts a 320 N load with an effort of 80 N. What is its mechanical advantage (MA)?
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.Which of these is caused by muscular force? (a) squeezing a lemon (b) shoes grip the floor (c) rain falls to the ground (d) rubbing hands warms them
8. 8.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
9. 9.Which of these is caused by gravity? (a) a river flows downhill (b) a compass needle turns (c) a magnet picks up pins (d) a rolling ball slows
10. 10.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
11. 11.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)
13. 13.🪝 A load of 480 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
15. 15.True or false: a crowbar is a class 3 lever (effort in the middle). (a) False (b) True
16. 16.💪 A box weighs 450 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
18. 18.🏋️ A force of 150 N pushes a cart 3 m along the floor. How much work is done, in joules?
19. 19.True or false: skating on ice gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.True or false: pushing a swing is a pull. (a) True (b) False
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ A seesaw balances. Kabir (220 N) sits 4 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
26. 26.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
29. 29.💪 Which force is at work: shoes grip the floor? (a) friction (b) gravity (c) muscular force (d) magnetic force
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
31. 31.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) muscular force (c) gravity (d) friction
32. 32.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
34. 34.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
36. 36.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
37. 37.True or false: chalk on a gym bar gives less friction. (a) True (b) False
38. 38.Which of these is caused by magnetic force? (a) a compass needle turns (b) brakes stop a bicycle (c) a thrown ball comes down (d) squeezing a lemon
39. 39.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet

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