Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 397 · 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.⚖️ 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
2. 2.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 360 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
4. 4.Which of these is a wedge? (a) a knife edge (b) a seesaw (c) a wheelchair ramp (d) a road up a hill
5. 5.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) screw (c) inclined plane (d) lever
6. 6.💪 Two children push a box to the right, one with 80 N and the other with 25 N. What is the net (total) force on the box, in newtons?
7. 7.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
8. 8.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
9. 9.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) skating on ice
11. 11.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
12. 12.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
13. 13.💪 Two children push a box to the right, one with 100 N and the other with 10 N. What is the net (total) force on the box, in newtons?
14. 14.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
17. 17.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
19. 19.⚖️ A seesaw balances. Asha (170 N) sits ? m from the pivot on one side; Zoya (340 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
20. 20.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
21. 21.True or false: hitting a cricket ball is a pull. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
23. 23.🪝 A load of 140 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
24. 24.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
25. 25.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
26. 26.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
27. 27.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
29. 29.True or false: a movable pulley rises with the load. (a) False (b) True
30. 30.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.💪 A cart is pulled to the right with 85 N and to the left with 95 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
34. 34.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
35. 35.💪 A box weighs 370 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
38. 38.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
39. 39.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
40. 40.⚖️ A seesaw balances. Zoya (360 N) sits ? m from the pivot on one side; Kabir (240 N) sits 3 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