Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 200 · 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) against the motion (c) only on ice (d) with the motion
2. 2.True or false: plucking a mango is a pull. (a) True (b) False
3. 3.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) doubled (c) gravity (d) balanced
4. 4.Which of these is caused by friction? (a) lifting a school bag (b) a river flows downhill (c) a magnet picks up pins (d) brakes stop a bicycle
5. 5.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
6. 6.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 50 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.Which of these is caused by magnetic force? (a) a river flows downhill (b) brakes stop a bicycle (c) a thrown ball comes down (d) a compass needle turns
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
9. 9.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
10. 10.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
11. 11.💪 Two children push a box to the right, one with 10 N and the other with 30 N. What is the net (total) force on the box, in newtons?
12. 12.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
13. 13.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.True or false: a fixed pulley stays in one place. (a) False (b) True
16. 16.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
17. 17.True or false: pressing a doorbell is a pull. (a) True (b) False
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
19. 19.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) an apple falls down (c) a magnet picks up pins (d) lifting a school bag
21. 21.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
22. 22.🔍 Which is the odd one out? (a) a crane hook block (b) a screw jack (c) a wood screw (d) a jar lid
23. 23.⚖️ 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 3 (c) class 2
24. 24.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
26. 26.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
28. 28.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
29. 29.⚖️ A seesaw balances. Asha (160 N) sits ? m from the pivot on one side; Ravi (640 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
30. 30.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.💪 A bag has a mass of 22 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
34. 34.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
35. 35.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
36. 36.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
37. 37.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
38. 38.🔍 Which is the odd one out? (a) a round doorknob (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a window blind cord
39. 39.💪 Two children push a box to the right, one with 75 N and the other with 60 N. What is the net (total) force on the box, in newtons?
40. 40.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?

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