Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 166 · 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 30 cm, the fulcrum at 60 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.True or false: a fixed pulley needs effort = load. (a) False (b) True
5. 5.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
8. 8.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
10. 10.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a seesaw (c) a water tap handle (d) a crowbar
11. 11.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 200 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
13. 13.True or false: a bottle opener is a lever. (a) False (b) True
14. 14.⚖️ A lever bar balances. The load is 120 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?
15. 15.💪 In a tug of war, one team pulls right with 45 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
16. 16.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.⚖️ A seesaw balances. Arjun (300 N) sits 3 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
20. 20.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
21. 21.True or false: a screw jack is a lever. (a) False (b) True
22. 22.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) gravity (c) friction (d) muscular force
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
24. 24.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
25. 25.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) friction (c) muscular force (d) magnetic force
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (280 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
32. 32.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
33. 33.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
34. 34.🪝 A bucket weighing 100 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.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
36. 36.True or false: a smooth steel slide gives more friction. (a) False (b) True
37. 37.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids