Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 714 · 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.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Zoya (510 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
4. 4.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
5. 5.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) balanced (d) doubled
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.🏋️ A force of 490 N pushes a cart 10 m along the floor. How much work is done, in joules?
8. 8.True or false: a seesaw is a lever. (a) True (b) False
9. 9.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
10. 10.⚙️ Which simple machine is a bottle cap? (a) wheel and axle (b) inclined plane (c) lever (d) screw
11. 11.💪 Two children push a box to the right, one with 95 N and the other with 80 N. What is the net (total) force on the box, in newtons?
12. 12.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
13. 13.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 3 (c) class 1
14. 14.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
15. 15.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
16. 16.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) make new energy (d) switch off gravity
17. 17.True or false: closing a drawer is a push. (a) False (b) True
18. 18.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
19. 19.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) muscular force (c) magnetic force (d) gravity
20. 20.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) False (b) True
21. 21.True or false: pulling up your socks is a pull. (a) False (b) True
22. 22.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
23. 23.🏋️ A force of 390 N pushes a cart 5 m along the floor. How much work is done, in joules?
24. 24.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
26. 26.💪 A box weighs 350 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
27. 27.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
28. 28.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
29. 29.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🔍 Which is the odd one out? (a) a wheelchair ramp (b) the tip of a nail (c) a road up a hill (d) a truck loading ramp
31. 31.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
32. 32.🏋️ A force of 90 N pushes a cart 3 m along the floor. How much work is done, in joules?
33. 33.True or false: a fixed pulley needs effort = load. (a) False (b) True
34. 34.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Zoya (400 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
36. 36.⚖️ 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
37. 37.True or false: a rough doormat gives more friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) the tip of a nail (b) a truck loading ramp (c) a door stopper (d) an axe blade
39. 39.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
40. 40.⚖️ A seesaw balances. Kabir (480 N) sits 4 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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