Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 592 · 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.💪 A cart is pulled to the right with 65 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
4. 4.⚖️ 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 3 (c) class 1
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
7. 7.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) friction (d) magnetic force
8. 8.🔍 Which is the odd one out? (a) a road up a hill (b) a playground slide (c) a truck loading ramp (d) a seesaw
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
10. 10.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
11. 11.⚖️ A lever bar balances. The load is 140 N at 40 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.💪 A box weighs 420 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
13. 13.True or false: a fixed pulley only changes direction. (a) False (b) True
14. 14.True or false: pushing a swing is a push. (a) False (b) True
15. 15.Which of these is caused by gravity? (a) brakes stop a bicycle (b) an apple falls down (c) a compass needle turns (d) a fridge magnet sticks
16. 16.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) False (b) True
17. 17.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
18. 18.True or false: a round doorknob is a pulley. (a) False (b) True
19. 19.Which of these is a pulley? (a) a bottle cap (b) a nutcracker (c) a seesaw (d) a crane hook block
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
22. 22.⚙️ Which simple machine is a round doorknob? (a) pulley (b) wedge (c) wheel and axle (d) inclined plane
23. 23.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) gravity (c) magnetic force (d) friction
24. 24.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) newton (N) (d) second (s)
25. 25.True or false: a crowbar is a wheel and axle. (a) True (b) False
26. 26.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the size of the load (d) the colour of rope
27. 27.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
28. 28.True or false: hitting a cricket ball is a pull. (a) True (b) False
29. 29.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
30. 30.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
32. 32.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) friction (d) magnetic force
33. 33.🔍 Which is the odd one out? (a) a truck loading ramp (b) a playground slide (c) a bottle opener (d) a wheelchair ramp
34. 34.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
35. 35.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
36. 36.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 12 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
38. 38.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?

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