Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 2 · 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.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
2. 2.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
3. 3.True or false: chalk on a gym bar gives more friction. (a) False (b) True
4. 4.🪝 A pulley system lifts a 510 N load with an effort of 170 N. What is its mechanical advantage (MA)?
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) skating on ice (d) a grippy rubber sole
6. 6.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
7. 7.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
8. 8.Which of these is a wheel and axle? (a) a bottle opener (b) a playground slide (c) a well-bucket rope wheel (d) a steering wheel
9. 9.🔍 Which is the odd one out? (a) a jar lid (b) a screw jack (c) a playground slide (d) a wood screw
10. 10.Which of these is caused by muscular force? (a) a rolling ball slows (b) a magnet picks up pins (c) squeezing a lemon (d) an apple falls down
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a smooth steel slide (d) skating on ice
12. 12.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.True or false: kicking a football is a pull. (a) False (b) True
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
16. 16.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
17. 17.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 490 N bucket on the axle, in newtons? (ideal)
18. 18.⚖️ A lever bar balances. The load is 400 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
20. 20.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) friction (c) muscular force (d) gravity
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
23. 23.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.⚙️ Which simple machine is a jar lid? (a) wedge (b) inclined plane (c) wheel and axle (d) screw
25. 25.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the rock (d) on the fulcrum
26. 26.🏋️ A force of 30 N did 240 J of work. How many metres did the object move?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a bent lever (d) a kind of wheel
29. 29.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
30. 30.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
31. 31.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
32. 32.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
33. 33.⚖️ A seesaw balances. Arjun (160 N) sits 2 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
35. 35.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
36. 36.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
37. 37.💪 A cart is pulled to the right with 25 N and to the left with 30 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
38. 38.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.🪝 A load of 120 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Meena (720 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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