Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 586 · 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.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
3. 3.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
4. 4.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
6. 6.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
7. 7.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🪝 A bucket weighing 380 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.True or false: a door stopper is a wedge. (a) False (b) True
11. 11.💪 A box weighs 370 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🪝 A pulley system lifts a 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
13. 13.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
17. 17.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
18. 18.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
19. 19.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
20. 20.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
22. 22.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
23. 23.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
25. 25.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
26. 26.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
28. 28.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
29. 29.Which of these is a wedge? (a) a chisel (b) a bottle cap (c) a nut and bolt (d) a truck loading ramp
30. 30.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.Which of these is caused by friction? (a) shoes grip the floor (b) a magnet picks up pins (c) lifting a school bag (d) an apple falls down
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.🔍 Which is the odd one out? (a) a seesaw (b) a wheelchair ramp (c) a truck loading ramp (d) a playground slide
36. 36.True or false: a movable pulley is on a flagpole top. (a) False (b) True
37. 37.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
38. 38.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
40. 40.🪝 A load of 1120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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