Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 221 · 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.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
2. 2.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
3. 3.True or false: pressing a doorbell is a push. (a) False (b) True
4. 4.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
5. 5.💪 Two children push a box to the right, one with 75 N and the other with 5 N. What is the net (total) force on the box, in newtons?
6. 6.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 400 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) chalk on a gym bar (d) a smooth steel slide
8. 8.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
9. 9.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
10. 10.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.💪 A cart is pulled to the right with 65 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
12. 12.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
13. 13.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🏋️ A force of 80 N pushes a cart 3 m along the floor. How much work is done, in joules?
15. 15.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
17. 17.🏋️ Pushing a crate 1 m took 420 J of work. What force was used, in newtons?
18. 18.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
19. 19.🪝 A load of 120 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.🔍 Which is the odd one out? (a) a well winch handle (b) a road up a hill (c) a steering wheel (d) a water tap handle
22. 22.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
23. 23.True or false: pushing a trolley is a pull. (a) True (b) False
24. 24.🏋️ A force of 210 N pushes a cart 8 m along the floor. How much work is done, in joules?
25. 25.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
26. 26.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
27. 27.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
28. 28.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
29. 29.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
30. 30.🔍 Which is the odd one out? (a) a jar lid (b) a well-bucket rope wheel (c) a bottle cap (d) a screw jack
31. 31.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) gravity (d) balanced
32. 32.True or false: a well winch handle is a pulley. (a) False (b) True
33. 33.💪 A cart is pulled to the right with 75 N and to the left with 90 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
34. 34.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) inclined plane (c) wedge (d) lever
35. 35.⚖️ A lever bar balances. The load is 800 N at 20 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?
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
38. 38.⚖️ A seesaw balances. Arjun (200 N) sits 2 m from the pivot on one side; Ravi (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) wedge (c) screw (d) wheel and axle
40. 40.💪 A cart is pulled to the right with 90 N and to the left with 85 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left

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