Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 621 · 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 is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
2. 2.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
3. 3.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
4. 4.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
5. 5.💪 Two children push a box to the right, one with 30 N and the other with 15 N. What is the net (total) force on the box, in newtons?
6. 6.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
7. 7.⚖️ 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 1 (c) class 3
8. 8.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
9. 9.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
13. 13.💪 Two children push a box to the right, one with 10 N and the other with 10 N. What is the net (total) force on the box, in newtons?
14. 14.💪 Which force pulls everything towards the Earth? (a) gravity (b) wind (c) friction (d) magnetism
15. 15.Which of these is a pulley? (a) a nutcracker (b) a wheelchair ramp (c) an axe blade (d) a well-bucket rope wheel
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
18. 18.💪 A cart is pulled to the right with 95 N and to the left with 80 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.Which of these is caused by muscular force? (a) a compass needle turns (b) rain falls to the ground (c) pedalling a cycle (d) a river flows downhill
22. 22.True or false: a wet tiled floor gives more friction. (a) False (b) True
23. 23.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
25. 25.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
26. 26.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
29. 29.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
30. 30.💪 A box weighs 470 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
32. 32.🏋️ A force of 270 N did 1080 J of work. How many metres did the object move?
33. 33.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
34. 34.🏋️ Pushing a crate 6 m took 2100 J of work. What force was used, in newtons?
35. 35.💪 Two children push a box to the right, one with 90 N and the other with 80 N. What is the net (total) force on the box, in newtons?
36. 36.True or false: a crane hook block is a screw. (a) False (b) True
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
39. 39.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor

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