Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 881 · 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 well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
2. 2.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
3. 3.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
4. 4.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
5. 5.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🔍 Which is the odd one out? (a) a truck loading ramp (b) a water tap handle (c) a round doorknob (d) a well winch handle
7. 7.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
8. 8.True or false: pressing a doorbell is a pull. (a) False (b) True
9. 9.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
11. 11.True or false: powder on a carrom board gives more friction. (a) True (b) False
12. 12.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 75 N. What is the size of the net force, in newtons?
13. 13.True or false: a crane hook block is a pulley. (a) False (b) True
14. 14.⚖️ A lever bar balances. The load is 360 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) muscular force (c) friction (d) magnetic force
17. 17.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🏋️ A force of 100 N did 300 J of work. How many metres did the object move?
20. 20.⚖️ A seesaw balances. Arjun (560 N) sits 3 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
22. 22.Which of these is caused by friction? (a) an apple falls down (b) brakes stop a bicycle (c) a fridge magnet sticks (d) a thrown ball comes down
23. 23.⚖️ A seesaw balances. Arjun (340 N) sits 4 m from the pivot on one side; Meena (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
26. 26.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
27. 27.Which of these is caused by gravity? (a) rubbing hands warms them (b) lifting a school bag (c) squeezing a lemon (d) a thrown ball comes down
28. 28.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
29. 29.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) screw (c) pulley (d) wheel and axle
30. 30.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.🏋️ Pushing a crate 2 m took 740 J of work. What force was used, in newtons?
34. 34.💪 Which force pulls everything towards the Earth? (a) gravity (b) friction (c) wind (d) magnetism
35. 35.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
36. 36.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
37. 37.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
38. 38.💪 Two children push a box to the right, one with 90 N and the other with 20 N. What is the net (total) force on the box, in newtons?
39. 39.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
40. 40.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?

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