Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 973 · 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: a fixed pulley hangs on the rope loop. (a) False (b) True
2. 2.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
3. 3.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
4. 4.💪 Two children push a box to the right, one with 50 N and the other with 15 N. What is the net (total) force on the box, in newtons?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
6. 6.🏋️ A force of 350 N pushes a cart 6 m along the floor. How much work is done, in joules?
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
8. 8.Which of these is caused by friction? (a) a rolling ball slows (b) an apple falls down (c) pedalling a cycle (d) a compass needle turns
9. 9.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
10. 10.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) unbalanced (c) balanced (d) doubled
11. 11.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.Which of these is a lever? (a) a water tap handle (b) a flagpole rope wheel (c) a bottle opener (d) a round doorknob
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
16. 16.True or false: pulling a cart is a pull. (a) False (b) True
17. 17.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
18. 18.⚖️ A seesaw balances. Ravi (280 N) sits 1 m from the pivot on one side; Arjun (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.💪 In a tug of war, one team pulls left with 10 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
20. 20.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a tyre with deep treads (d) a rough doormat
22. 22.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.💪 Two children push a box to the right, one with 35 N and the other with 85 N. What is the net (total) force on the box, in newtons?
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.True or false: an axe blade is a lever. (a) True (b) False
27. 27.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
28. 28.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
29. 29.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a rope on a wheel (d) a wheel on a rod
30. 30.💪 A cart is pulled to the right with 50 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
31. 31.True or false: sand on a slippery path gives more friction. (a) False (b) True
32. 32.True or false: opening a drawer is a push. (a) False (b) True
33. 33.🏋️ Pushing a crate 5 m took 250 J of work. What force was used, in newtons?
34. 34.🪝 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?
35. 35.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
36. 36.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
37. 37.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) friction (c) magnetic force (d) gravity
38. 38.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
39. 39.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) gravity (d) magnetic force
40. 40.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort

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