Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 918 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 110 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
2. 2.🏋️ Pushing a crate 3 m took 1050 J of work. What force was used, in newtons?
3. 3.True or false: a fixed pulley stays in one place. (a) True (b) False
4. 4.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
5. 5.Which of these is caused by muscular force? (a) shoes grip the floor (b) a rolling ball slows (c) an apple falls down (d) squeezing a lemon
6. 6.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
7. 7.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Asha (600 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
10. 10.💪 Two children push a box to the right, one with 25 N and the other with 45 N. What is the net (total) force on the box, in newtons?
11. 11.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
12. 12.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
13. 13.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
14. 14.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
16. 16.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
17. 17.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot
18. 18.Which of these is a pulley? (a) a crowbar (b) a chisel (c) a crane hook block (d) a round doorknob
19. 19.True or false: a truck loading ramp is an inclined plane. (a) True (b) False
20. 20.💪 A box weighs 530 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
22. 22.🏋️ A force of 180 N pushes a cart 6 m along the floor. How much work is done, in joules?
23. 23.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.⚖️ A lever bar balances. The load is 270 N at 10 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?
26. 26.True or false: pushing a swing is a push. (a) False (b) True
27. 27.True or false: a round doorknob is a screw. (a) True (b) False
28. 28.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
30. 30.⚖️ A lever bar balances. The load is 120 N at 50 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?
31. 31.⚙️ Which simple machine is a well-bucket rope wheel? (a) wheel and axle (b) lever (c) pulley (d) wedge
32. 32.⚖️ A seesaw balances. Asha (340 N) sits 1 m from the pivot on one side; Ravi (170 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
35. 35.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
36. 36.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
38. 38.⚖️ 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
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.⚙️ Which simple machine is a nutcracker? (a) screw (b) pulley (c) lever (d) wheel and axle

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