Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 500 · 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.True or false: a smooth steel slide gives less friction. (a) False (b) True
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.True or false: a knife edge is a lever. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.🪝 A load of 180 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
9. 9.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a nutcracker (c) a knife edge (d) a round doorknob
10. 10.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
11. 11.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
12. 12.⚖️ A seesaw balances. Meena (450 N) sits ? m from the pivot on one side; Kabir (450 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
13. 13.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
15. 15.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
17. 17.⚖️ A seesaw balances. Asha (200 N) sits 4 m from the pivot on one side; Ravi (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.🔍 Which is the odd one out? (a) a seesaw (b) a crowbar (c) a bottle opener (d) a wheelchair ramp
19. 19.True or false: pulling up your socks is a pull. (a) False (b) True
20. 20.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🏋️ A force of 120 N did 120 J of work. How many metres did the object move?
22. 22.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the load (d) the fulcrum
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
24. 24.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
25. 25.⚖️ A lever bar balances. The load is 160 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the colour of rope (d) the size of the load
27. 27.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
29. 29.💪 A box weighs 550 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.True or false: a fixed pulley needs effort = load. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
32. 32.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
33. 33.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
34. 34.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
35. 35.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Arjun (520 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.True or false: a well-bucket rope wheel is an inclined plane. (a) False (b) True
37. 37.True or false: sand on a slippery path gives more friction. (a) True (b) False
38. 38.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
39. 39.Which of these is a wheel and axle? (a) a well winch handle (b) a crowbar (c) a seesaw (d) a wheelchair ramp
40. 40.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True

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