Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 445 · 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.⚖️ A seesaw balances. Asha (390 N) sits ? m from the pivot on one side; Kabir (520 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
2. 2.True or false: a grippy rubber sole gives more friction. (a) True (b) False
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.⚖️ A seesaw balances. Meena (300 N) sits ? m from the pivot on one side; Arjun (100 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the axle (d) the load
9. 9.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
10. 10.🏋️ A force of 210 N pushes a cart 9 m along the floor. How much work is done, in joules?
11. 11.⚖️ 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 2 (c) class 1
12. 12.🔍 Which is the odd one out? (a) a seesaw (b) a bottle opener (c) a crowbar (d) a crane hook block
13. 13.True or false: chalk on a gym bar gives less friction. (a) False (b) True
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
15. 15.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the fulcrum (c) the effort (d) the load
16. 16.🔍 Which is the odd one out? (a) a steering wheel (b) a round doorknob (c) a well winch handle (d) a claw hammer on a nail
17. 17.🏋️ A force of 90 N pushes a cart 8 m along the floor. How much work is done, in joules?
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
20. 20.True or false: a movable pulley only changes direction. (a) False (b) True
21. 21.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
22. 22.🏋️ Pushing a crate 4 m took 480 J of work. What force was used, in newtons?
23. 23.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
24. 24.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) inclined plane (c) pulley (d) screw
25. 25.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
26. 26.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
29. 29.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 40 N. What is the size of the net force, in newtons?
30. 30.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
31. 31.True or false: a flagpole rope wheel is a pulley. (a) True (b) False
32. 32.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
33. 33.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
34. 34.⚖️ A lever bar balances. The load is 1000 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.⚙️ Which simple machine is a seesaw? (a) pulley (b) lever (c) inclined plane (d) wheel and axle
37. 37.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
38. 38.🏋️ Pushing a crate 8 m took 800 J of work. What force was used, in newtons?
39. 39.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3

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