Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 971 · 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.True or false: chalk on a gym bar gives more friction. (a) False (b) True
2. 2.⚙️ Which simple machine is a playground slide? (a) wedge (b) pulley (c) lever (d) inclined plane
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.True or false: drawing up a well bucket is a push. (a) True (b) False
5. 5.🪝 A bucket weighing 440 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.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
7. 7.Which of these is caused by muscular force? (a) pedalling a cycle (b) rain falls to the ground (c) an apple falls down (d) a river flows downhill
8. 8.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 160 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a sharp wedge (d) a flat ramp
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
12. 12.💪 A cart is pulled to the right with 85 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
13. 13.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
14. 14.⚖️ A seesaw balances. Kabir (300 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.⚖️ A seesaw balances. Arjun (240 N) sits 4 m from the pivot on one side; Ravi (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
18. 18.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
19. 19.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?
20. 20.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.Which of these is a wheel and axle? (a) a well winch handle (b) a flagpole rope wheel (c) a bottle opener (d) a nut and bolt
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 100 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
24. 24.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.🪝 A load of 690 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) magnetic force (d) friction
28. 28.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1260 N bucket on the axle, in newtons? (ideal)
29. 29.True or false: pulling a cart is a pull. (a) True (b) False
30. 30.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
31. 31.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
32. 32.Which of these is caused by friction? (a) a compass needle turns (b) pedalling a cycle (c) shoes grip the floor (d) rain falls to the ground
33. 33.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
34. 34.🏋️ A force of 360 N pushes a cart 7 m along the floor. How much work is done, in joules?
35. 35.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
36. 36.🏋️ A force of 100 N did 500 J of work. How many metres did the object move?
37. 37.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a smooth steel slide (d) a grippy rubber sole
39. 39.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
40. 40.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum

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