Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 778 · 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 winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.🏋️ A force of 420 N pushes a cart 5 m along the floor. How much work is done, in joules?
4. 4.True or false: a smooth steel slide gives less friction. (a) False (b) True
5. 5.💪 Which force is at work: lifting a school bag? (a) magnetic force (b) friction (c) gravity (d) muscular force
6. 6.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
7. 7.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Kabir (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
9. 9.True or false: hitting a cricket ball is a pull. (a) False (b) True
10. 10.🏋️ A force of 90 N did 270 J of work. How many metres did the object move?
11. 11.True or false: a tyre with deep treads gives less friction. (a) True (b) False
12. 12.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) gravity (c) friction (d) muscular force
13. 13.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
14. 14.True or false: a screw jack is a screw. (a) False (b) True
15. 15.🏋️ A force of 110 N did 990 J of work. How many metres did the object move?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
17. 17.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
18. 18.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.💪 A box weighs 50 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.True or false: a truck loading ramp is an inclined plane. (a) True (b) False
22. 22.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
23. 23.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
24. 24.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
26. 26.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
27. 27.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
29. 29.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 250 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.⚙️ Which simple machine is a round doorknob? (a) wedge (b) lever (c) inclined plane (d) wheel and axle
33. 33.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🔍 Which is the odd one out? (a) a jar lid (b) a wheelchair ramp (c) a truck loading ramp (d) a road up a hill
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 15 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🔍 Which is the odd one out? (a) a window blind cord (b) a wheelchair ramp (c) a flagpole rope wheel (d) a crane hook block
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
39. 39.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
40. 40.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?

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