Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 435 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
3. 3.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
4. 4.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
6. 6.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
7. 7.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.True or false: kicking a football is a push. (a) True (b) False
9. 9.🏋️ A force of 70 N did 70 J of work. How many metres did the object move?
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a grippy rubber sole (d) powder on a carrom board
11. 11.⚖️ A seesaw balances. Arjun (140 N) sits ? m from the pivot on one side; Asha (420 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.True or false: kicking a football is a pull. (a) True (b) False
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.⚖️ A lever bar balances. The load is 600 N at 50 cm from the fulcrum. The effort is 500 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
16. 16.True or false: a tyre with deep treads gives less friction. (a) True (b) False
17. 17.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
18. 18.🏋️ A force of 420 N did 1680 J of work. How many metres did the object move?
19. 19.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.💪 In a tug of war, one team pulls left with 10 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
21. 21.⚖️ 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 2 (c) class 3
22. 22.Which of these is caused by friction? (a) rain falls to the ground (b) lifting a school bag (c) shoes grip the floor (d) a magnet picks up pins
23. 23.🏋️ A force of 30 N pushes a cart 7 m along the floor. How much work is done, in joules?
24. 24.True or false: a movable pulley is on a flagpole top. (a) False (b) True
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
26. 26.🏋️ Pushing a crate 1 m took 220 J of work. What force was used, in newtons?
27. 27.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
28. 28.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
29. 29.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) screw (c) lever (d) pulley
30. 30.True or false: a movable pulley stays in one place. (a) True (b) False
31. 31.True or false: a fixed pulley stays in one place. (a) True (b) False
32. 32.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
35. 35.🏋️ A 17 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.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1260 N bucket on the axle, in newtons? (ideal)
37. 37.⚖️ A lever bar balances. The load is 300 N at 50 cm from the fulcrum. The effort is 500 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.⚙️ Which simple machine is a water tap handle? (a) lever (b) wheel and axle (c) inclined plane (d) screw
40. 40.True or false: a bottle opener is a screw. (a) False (b) True

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