Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 137 · 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.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
2. 2.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
3. 3.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the fulcrum (d) the effort
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
5. 5.🔍 Which is the odd one out? (a) a door stopper (b) a seesaw (c) a nutcracker (d) a claw hammer on a nail
6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a flat ramp (d) a sharp wedge
7. 7.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
8. 8.⚖️ A seesaw balances. Meena (130 N) sits ? m from the pivot on one side; Zoya (260 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
9. 9.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (100 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
11. 11.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
12. 12.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
13. 13.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
14. 14.🏋️ Pushing a crate 4 m took 1480 J of work. What force was used, in newtons?
15. 15.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
16. 16.True or false: a rough doormat gives less friction. (a) False (b) True
17. 17.💪 A bag has a mass of 25 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
18. 18.True or false: a movable pulley is on a flagpole top. (a) False (b) True
19. 19.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
20. 20.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) screw (c) pulley (d) lever
21. 21.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) inclined plane (c) wedge (d) screw
22. 22.🏋️ A force of 120 N pushes a cart 10 m along the floor. How much work is done, in joules?
23. 23.True or false: pressing a doorbell is a push. (a) False (b) True
24. 24.💪 Two children push a box to the right, one with 80 N and the other with 25 N. What is the net (total) force on the box, in newtons?
25. 25.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) unbalanced (d) gravity
26. 26.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
27. 27.🏋️ A force of 340 N pushes a cart 9 m along the floor. How much work is done, in joules?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
30. 30.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
33. 33.⚖️ A seesaw balances. Asha (440 N) sits ? m from the pivot on one side; Arjun (110 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
35. 35.⚙️ Which simple machine is a jar lid? (a) pulley (b) inclined plane (c) screw (d) lever
36. 36.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
37. 37.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Asha (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🏋️ A force of 60 N did 480 J of work. How many metres did the object move?
39. 39.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot

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