Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 223 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
4. 4.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
5. 5.⚖️ 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
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)
8. 8.🏋️ Pushing a crate 2 m took 700 J of work. What force was used, in newtons?
9. 9.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
10. 10.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
11. 11.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.Which of these is a screw? (a) a screw jack (b) a playground slide (c) a crane hook block (d) a truck loading ramp
13. 13.⚙️ Which simple machine is the tip of a nail? (a) lever (b) screw (c) wheel and axle (d) wedge
14. 14.⚖️ A lever bar balances. The load is 90 N at 20 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.⚖️ A lever bar balances. The load is 720 N at 50 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
17. 17.True or false: a tug of war is a pull. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
19. 19.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
20. 20.True or false: a nut and bolt is a pulley. (a) False (b) True
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.Which of these is caused by gravity? (a) shoes grip the floor (b) a thrown ball comes down (c) lifting a school bag (d) rubbing hands warms them
23. 23.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
24. 24.🔍 Which is the odd one out? (a) a window blind cord (b) a well winch handle (c) a crane hook block (d) a flagpole rope wheel
25. 25.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
27. 27.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.💪 A cart is pulled to the right with 65 N and to the left with 65 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
30. 30.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
31. 31.⚖️ A lever bar balances. The load is 360 N at 50 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
34. 34.Which of these is a lever? (a) a knife edge (b) a road up a hill (c) a door stopper (d) a claw hammer on a nail
35. 35.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
36. 36.True or false: a tyre with deep treads gives less friction. (a) False (b) True
37. 37.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (200 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
39. 39.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
40. 40.⚙️ Which simple machine is a bottle cap? (a) lever (b) screw (c) wheel and axle (d) wedge

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