Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 604 · 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: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
2. 2.⚖️ 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 2 (c) class 3
3. 3.💪 In a tug of war, one team pulls right with 40 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
4. 4.⚙️ Which simple machine is a jar lid? (a) lever (b) screw (c) wedge (d) pulley
5. 5.True or false: opening a drawer is a push. (a) True (b) False
6. 6.⚖️ A lever bar balances. The load is 500 N at 40 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
8. 8.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
9. 9.True or false: a movable pulley is on a flagpole top. (a) False (b) True
10. 10.🏋️ Pushing a crate 2 m took 480 J of work. What force was used, in newtons?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
12. 12.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
13. 13.🔍 Which is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) a wood screw (d) a crane hook block
14. 14.Which of these is a screw? (a) a bottle cap (b) a window blind cord (c) a door stopper (d) a truck loading ramp
15. 15.Which of these is caused by friction? (a) lifting a school bag (b) a compass needle turns (c) a thrown ball comes down (d) rubbing hands warms them
16. 16.True or false: a tyre with deep treads gives more friction. (a) True (b) False
17. 17.🛞 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 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 3 (d) 12
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
21. 21.💪 A bag has a mass of 19 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
23. 23.True or false: a steering wheel is a screw. (a) False (b) True
24. 24.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.Which of these is a wedge? (a) a claw hammer on a nail (b) a well-bucket rope wheel (c) a bottle opener (d) a chisel
28. 28.🪝 A load of 690 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
30. 30.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
31. 31.🏋️ A force of 300 N did 1200 J of work. How many metres did the object move?
32. 32.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
33. 33.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
34. 34.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
35. 35.🏋️ A force of 280 N pushes a cart 8 m along the floor. How much work is done, in joules?
36. 36.True or false: opening a drawer is a pull. (a) False (b) True
37. 37.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
38. 38.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 75 N. What is the size of the net force, in newtons?
39. 39.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a round doorknob (d) a crane hook block
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet

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