Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 851 · 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 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
3. 3.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
6. 6.💪 In a tug of war, one team pulls left with 95 N and the other pulls right with 65 N. What is the size of the net force, in newtons?
7. 7.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
8. 8.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚖️ A seesaw balances. Arjun (480 N) sits ? m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
11. 11.True or false: chalk on a gym bar gives less friction. (a) False (b) True
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
14. 14.🏋️ Pushing a crate 10 m took 3000 J of work. What force was used, in newtons?
15. 15.🏋️ Pushing a crate 4 m took 280 J of work. What force was used, in newtons?
16. 16.🏋️ A force of 390 N pushes a cart 5 m along the floor. How much work is done, in joules?
17. 17.🪝 A load of 960 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
19. 19.💪 A bag has a mass of 26 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
21. 21.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
22. 22.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.True or false: pulling a cart is a pull. (a) True (b) False
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 90 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
25. 25.🪝 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
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Asha (330 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.💪 A cart is pulled to the right with 30 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
28. 28.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
29. 29.🏋️ A force of 230 N pushes a cart 5 m along the floor. How much work is done, in joules?
30. 30.💪 A box weighs 240 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.⚖️ A seesaw balances. Zoya (160 N) sits ? m from the pivot on one side; Meena (160 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
35. 35.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
36. 36.⚙️ Which simple machine is a water tap handle? (a) pulley (b) wheel and axle (c) wedge (d) screw
37. 37.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) friction (d) wind
38. 38.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
39. 39.Which of these is a lever? (a) an axe blade (b) a nut and bolt (c) a jar lid (d) a bottle opener
40. 40.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push

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