Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 411 · 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 nutcracker is a class 1 lever (fulcrum in the middle). (a) False (b) True
2. 2.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
3. 3.True or false: a fixed pulley stays in one place. (a) True (b) False
4. 4.🪝 A load of 260 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
6. 6.True or false: a fixed pulley halves the effort. (a) True (b) False
7. 7.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
8. 8.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the load (d) the effort
9. 9.True or false: pulling up your socks is a push. (a) True (b) False
10. 10.⚖️ 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
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
12. 12.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
13. 13.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
14. 14.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
15. 15.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
16. 16.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
17. 17.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
18. 18.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
19. 19.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
21. 21.🔍 Which is the odd one out? (a) an axe blade (b) a knife edge (c) the tip of a nail (d) a well winch handle
22. 22.💪 Which force is at work: lifting a school bag? (a) magnetic force (b) friction (c) gravity (d) muscular force
23. 23.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 100 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
25. 25.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
26. 26.True or false: pressing a doorbell is a pull. (a) True (b) False
27. 27.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
31. 31.🏋️ Pushing a crate 4 m took 1400 J of work. What force was used, in newtons?
32. 32.⚙️ Which simple machine is a bottle opener? (a) wheel and axle (b) lever (c) wedge (d) screw
33. 33.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
34. 34.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
37. 37.💪 Two children push a box to the right, one with 40 N and the other with 70 N. What is the net (total) force on the box, in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
40. 40.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) newton (N) (d) metre (m)

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