Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 141 · 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: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
2. 2.True or false: a rough doormat gives more friction. (a) True (b) False
3. 3.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
4. 4.🪝 A load of 920 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.True or false: pushing a trolley is a push. (a) False (b) True
6. 6.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Asha (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
10. 10.💪 A cart is pulled to the right with 75 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
11. 11.Which of these is a lever? (a) an axe blade (b) a flagpole rope wheel (c) a wood screw (d) a nutcracker
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
15. 15.🏋️ A force of 430 N did 3440 J of work. How many metres did the object move?
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
20. 20.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
21. 21.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) muscular force (d) gravity
22. 22.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wet tiled floor (d) a tyre with deep treads
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
27. 27.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) wedge (c) screw (d) wheel and axle
28. 28.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
29. 29.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) lever (c) wheel and axle (d) wedge
32. 32.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.💪 Two children push a box to the right, one with 10 N and the other with 85 N. What is the net (total) force on the box, in newtons?
35. 35.⚖️ A seesaw balances. Kabir (400 N) sits 1 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
37. 37.🪝 A bucket weighing 340 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
39. 39.🛞 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 11 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3

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