Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 890 · 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.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
2. 2.⚖️ A lever bar balances. The load is 30 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
4. 4.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
5. 5.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
6. 6.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
7. 7.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
9. 9.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
10. 10.True or false: a movable pulley halves the effort. (a) True (b) False
11. 11.Which of these is a pulley? (a) a nutcracker (b) a wheelchair ramp (c) a flagpole rope wheel (d) an axe blade
12. 12.⚖️ A seesaw balances. Zoya (480 N) sits 2 m from the pivot on one side; Kabir (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
13. 13.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.Which of these is caused by friction? (a) a thrown ball comes down (b) rain falls to the ground (c) pedalling a cycle (d) rubbing hands warms them
15. 15.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
16. 16.Which of these is an inclined plane? (a) a bottle opener (b) an axe blade (c) a truck loading ramp (d) a door stopper
17. 17.🔍 Which is the odd one out? (a) a screw jack (b) a wheelchair ramp (c) a nut and bolt (d) a bottle cap
18. 18.True or false: a box pushed on carpet gives less friction. (a) False (b) True
19. 19.True or false: a fixed pulley only changes direction. (a) True (b) False
20. 20.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
21. 21.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
23. 23.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
24. 24.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
25. 25.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
26. 26.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
27. 27.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 12 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
31. 31.💪 Which force is at work: a magnet picks up pins? (a) friction (b) gravity (c) magnetic force (d) muscular force
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) chalk on a gym bar (d) skating on ice
33. 33.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
34. 34.⚙️ Which simple machine is a knife edge? (a) wedge (b) inclined plane (c) pulley (d) lever
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.⚖️ A seesaw balances. Kabir (180 N) sits 2 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
39. 39.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
40. 40.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)

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