Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 328 · 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.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
3. 3.True or false: a round doorknob is a pulley. (a) False (b) True
4. 4.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 3 (c) class 1
5. 5.True or false: pushing a swing is a pull. (a) True (b) False
6. 6.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
7. 7.🔍 Which is the odd one out? (a) a nutcracker (b) a nut and bolt (c) a jar lid (d) a screw jack
8. 8.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
9. 9.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
11. 11.⚖️ A lever bar balances. The load is 360 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.⚙️ Which simple machine is a knife edge? (a) lever (b) wedge (c) wheel and axle (d) screw
13. 13.⚖️ A seesaw balances. Asha (480 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
15. 15.🏋️ A force of 160 N pushes a cart 1 m along the floor. How much work is done, in joules?
16. 16.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
18. 18.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
19. 19.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.⚙️ Which simple machine is a crane hook block? (a) wheel and axle (b) wedge (c) lever (d) pulley
21. 21.True or false: a round doorknob is a wedge. (a) False (b) True
22. 22.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a tyre with deep treads (d) a wet tiled floor
25. 25.🔍 Which is the odd one out? (a) a door stopper (b) a knife edge (c) a road up a hill (d) the tip of a nail
26. 26.⚖️ A lever bar balances. The load is 280 N at 30 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
28. 28.💪 A cart is pulled to the right with 30 N and to the left with 25 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
29. 29.💪 In a tug of war, one team pulls left with 35 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
30. 30.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
31. 31.⚙️ Which simple machine is a window blind cord? (a) lever (b) pulley (c) inclined plane (d) wheel and axle
32. 32.True or false: a fixed pulley only changes direction. (a) False (b) True
33. 33.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
34. 34.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
35. 35.🏋️ Pushing a crate 6 m took 1260 J of work. What force was used, in newtons?
36. 36.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
37. 37.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
38. 38.True or false: kicking a football is a pull. (a) False (b) True
39. 39.⚖️ A seesaw balances. Asha (240 N) sits ? m from the pivot on one side; Zoya (120 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank

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