Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 852 · 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 bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.🪝 A load of 520 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
4. 4.Which of these is caused by gravity? (a) a fridge magnet sticks (b) a compass needle turns (c) an apple falls down (d) shoes grip the floor
5. 5.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.💪 Two children push a box to the right, one with 30 N and the other with 20 N. What is the net (total) force on the box, in newtons?
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
8. 8.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
9. 9.True or false: opening a drawer is a push. (a) False (b) True
10. 10.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
11. 11.⚖️ A seesaw balances. Zoya (300 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) wedge (c) inclined plane (d) lever
13. 13.True or false: a water tap handle is a wheel and axle. (a) True (b) False
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
15. 15.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
16. 16.True or false: a box pushed on carpet gives more friction. (a) False (b) True
17. 17.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
20. 20.Which of these is caused by muscular force? (a) rain falls to the ground (b) rubbing hands warms them (c) a rolling ball slows (d) lifting a school bag
21. 21.⚖️ A seesaw balances. Asha (560 N) sits 2 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.💪 A cart is pulled to the right with 65 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
23. 23.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
24. 24.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
25. 25.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) magnetic force (d) friction
26. 26.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
27. 27.⚙️ Which simple machine is a well winch handle? (a) lever (b) wedge (c) wheel and axle (d) screw
28. 28.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
29. 29.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🏋️ Pushing a crate 8 m took 3440 J of work. What force was used, in newtons?
31. 31.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) muscular force (d) gravity
32. 32.🏋️ A force of 210 N pushes a cart 3 m along the floor. How much work is done, in joules?
33. 33.🏋️ A force of 40 N pushes a cart 10 m along the floor. How much work is done, in joules?
34. 34.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
37. 37.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
38. 38.💪 A bag has a mass of 30 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) wedge (c) inclined plane (d) pulley
40. 40.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (180 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?

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