Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 728 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
3. 3.⚙️ Which simple machine is a flagpole rope wheel? (a) screw (b) lever (c) wedge (d) pulley
4. 4.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
6. 6.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
7. 7.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
9. 9.💪 A cart is pulled to the right with 70 N and to the left with 65 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
10. 10.Which of these is a wheel and axle? (a) an axe blade (b) a jar lid (c) a steering wheel (d) a flagpole rope wheel
11. 11.⚙️ Which simple machine is a claw hammer on a nail? (a) inclined plane (b) lever (c) wedge (d) pulley
12. 12.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
13. 13.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
14. 14.⚖️ A seesaw balances. Arjun (100 N) sits 4 m from the pivot on one side; Kabir (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
15. 15.🔍 Which is the odd one out? (a) a chisel (b) the tip of a nail (c) a well winch handle (d) a knife edge
16. 16.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) more effort needed (d) no change
17. 17.True or false: a seesaw is a wheel and axle. (a) False (b) True
18. 18.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
19. 19.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 280 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
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 1 (b) class 3 (c) class 2
24. 24.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
25. 25.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
26. 26.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
27. 27.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.⚙️ Which simple machine is a bottle opener? (a) wedge (b) lever (c) screw (d) wheel and axle
30. 30.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) a thrown ball comes down (d) rubbing hands warms them
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
32. 32.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
33. 33.💪 A cart is pulled to the right with 55 N and to the left with 55 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
34. 34.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
36. 36.True or false: powder on a carrom board gives less friction. (a) False (b) True
37. 37.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.True or false: a well winch handle is a wheel and axle. (a) True (b) False
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.Which of these is an inclined plane? (a) the tip of a nail (b) a bottle opener (c) an axe blade (d) a road up a hill

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