Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 750 · 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.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
2. 2.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
3. 3.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) doubled (c) balanced (d) gravity
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
5. 5.⚖️ A seesaw balances. Kabir (140 N) sits ? m from the pivot on one side; Arjun (560 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
7. 7.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 110 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.🏋️ A force of 440 N did 2640 J of work. How many metres did the object move?
10. 10.💪 In a tug of war, one team pulls left with 80 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
11. 11.True or false: a tug of war is a pull. (a) False (b) True
12. 12.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) gravity (d) magnetism
13. 13.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.⚖️ A lever bar balances. The load is 480 N at ? cm from the fulcrum. The effort is 160 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
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 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.🏋️ A force of 30 N did 240 J of work. How many metres did the object move?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) magnetic force (d) gravity
20. 20.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.Which of these is a screw? (a) a jar lid (b) a steering wheel (c) the tip of a nail (d) a claw hammer on a nail
22. 22.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
23. 23.💪 A bag has a mass of 34 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
24. 24.🔍 Which is the odd one out? (a) a seesaw (b) a screw jack (c) a wood screw (d) a bottle cap
25. 25.⚖️ A lever bar balances. The load is 100 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
27. 27.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
28. 28.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
29. 29.🏋️ A force of 370 N pushes a cart 7 m along the floor. How much work is done, in joules?
30. 30.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.Which of these is caused by gravity? (a) squeezing a lemon (b) rubbing hands warms them (c) pedalling a cycle (d) an apple falls down
32. 32.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) False (b) True
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
35. 35.🏋️ A force of 170 N did 1530 J of work. How many metres did the object move?
36. 36.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wheel on ball bearings (d) a grippy rubber sole
38. 38.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
39. 39.True or false: hitting a cricket ball is a pull. (a) False (b) True
40. 40.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort

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