Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 91 · 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.Which of these is a wedge? (a) a window blind cord (b) a claw hammer on a nail (c) a door stopper (d) a well-bucket rope wheel
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a water tap handle (b) a wood screw (c) a well winch handle (d) a round doorknob
4. 4.💪 Which force is at work: rain falls to the ground? (a) friction (b) magnetic force (c) gravity (d) muscular force
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.⚙️ Which simple machine is a bottle opener? (a) wedge (b) pulley (c) lever (d) wheel and axle
7. 7.Which of these is caused by friction? (a) brakes stop a bicycle (b) a compass needle turns (c) a magnet picks up pins (d) a river flows downhill
8. 8.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
9. 9.💪 Which force is at work: shoes grip the floor? (a) gravity (b) friction (c) magnetic force (d) muscular force
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 1 (b) class 3 (c) class 2
11. 11.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
12. 12.⚙️ Which simple machine is a playground slide? (a) wheel and axle (b) pulley (c) lever (d) inclined plane
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.💪 A box weighs 280 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
17. 17.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
18. 18.🪝 A load of 900 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.⚖️ A lever bar balances. The load is 20 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
24. 24.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 70 N. What is the size of the net force, in newtons?
25. 25.True or false: a screw jack is a lever. (a) False (b) True
26. 26.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
29. 29.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
30. 30.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
31. 31.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
32. 32.🏋️ Pushing a crate 7 m took 1190 J of work. What force was used, in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
34. 34.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
36. 36.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
37. 37.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
38. 38.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
39. 39.🔍 Which is the odd one out? (a) a road up a hill (b) an axe blade (c) a truck loading ramp (d) a wheelchair ramp
40. 40.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?

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