Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 41 · 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.Which of these is caused by friction? (a) a river flows downhill (b) a rolling ball slows (c) squeezing a lemon (d) an apple falls down
2. 2.🔍 Which is the odd one out? (a) a nut and bolt (b) a playground slide (c) a road up a hill (d) a wheelchair ramp
3. 3.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
4. 4.🪝 A pulley system lifts a 600 N load with an effort of 150 N. What is its mechanical advantage (MA)?
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
6. 6.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
7. 7.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.⚖️ A seesaw balances. Asha (300 N) sits 2 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.True or false: a movable pulley needs effort = load. (a) True (b) False
10. 10.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
11. 11.🏋️ A force of 270 N pushes a cart 4 m along the floor. How much work is done, in joules?
12. 12.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.True or false: a round doorknob is a wheel and axle. (a) False (b) True
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
17. 17.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) nothing (d) the effort
18. 18.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
19. 19.⚙️ Which simple machine is a door stopper? (a) wedge (b) pulley (c) wheel and axle (d) inclined plane
20. 20.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
22. 22.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
23. 23.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
24. 24.💪 Which force is at work: squeezing a lemon? (a) friction (b) muscular force (c) magnetic force (d) gravity
25. 25.True or false: a playground slide is an inclined plane. (a) True (b) False
26. 26.💪 A cart is pulled to the right with 75 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
27. 27.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 6 (d) 10
28. 28.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Kabir (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
32. 32.🏋️ A force of 480 N did 2400 J of work. How many metres did the object move?
33. 33.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
34. 34.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
35. 35.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
36. 36.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
37. 37.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
38. 38.💪 A box weighs 330 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
39. 39.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
40. 40.⚖️ A seesaw balances. Asha (760 N) sits 3 m from the pivot on one side; Meena (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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