Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 305 · 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.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
3. 3.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
4. 4.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.True or false: a rough doormat gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
7. 7.True or false: opening a drawer is a pull. (a) False (b) True
8. 8.💪 Which force is at work: squeezing a lemon? (a) gravity (b) muscular force (c) friction (d) magnetic force
9. 9.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
10. 10.⚙️ Which simple machine is a wood screw? (a) inclined plane (b) screw (c) wedge (d) wheel and axle
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
13. 13.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
14. 14.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
15. 15.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
16. 16.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
18. 18.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
20. 20.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
22. 22.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
23. 23.Which of these is caused by muscular force? (a) an apple falls down (b) pedalling a cycle (c) shoes grip the floor (d) a compass needle turns
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
26. 26.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
27. 27.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the effort (c) the fulcrum (d) the load
28. 28.⚙️ Which simple machine is a truck loading ramp? (a) screw (b) lever (c) inclined plane (d) wedge
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
30. 30.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
31. 31.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.⚖️ A seesaw balances. Meena (390 N) sits ? m from the pivot on one side; Asha (130 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ A seesaw balances. Asha (150 N) sits 1 m from the pivot on one side; Zoya (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.💪 Two children push a box to the right, one with 40 N and the other with 15 N. What is the net (total) force on the box, in newtons?
36. 36.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
37. 37.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
39. 39.⚖️ 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 3 (c) class 1
40. 40.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)

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