Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 700 · 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.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
4. 4.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
5. 5.Which of these is a lever? (a) a well-bucket rope wheel (b) a bottle opener (c) a door stopper (d) a nut and bolt
6. 6.🏋️ A force of 420 N pushes a cart 6 m along the floor. How much work is done, in joules?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
8. 8.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
9. 9.True or false: a chisel is a wedge. (a) False (b) True
10. 10.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
11. 11.True or false: a fixed pulley only changes direction. (a) False (b) True
12. 12.💪 A cart is pulled to the right with 20 N and to the left with 5 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
13. 13.🔍 Which is the odd one out? (a) a knife edge (b) an axe blade (c) a truck loading ramp (d) the tip of a nail
14. 14.🏋️ A force of 420 N pushes a cart 7 m along the floor. How much work is done, in joules?
15. 15.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
17. 17.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
18. 18.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
19. 19.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a crane hook block (c) a playground slide (d) a truck loading ramp
20. 20.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
21. 21.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.💪 A box weighs 110 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
23. 23.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
24. 24.🏋️ Pushing a crate 1 m took 400 J of work. What force was used, in newtons?
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
27. 27.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
28. 28.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
30. 30.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
31. 31.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
32. 32.🏋️ Pushing a crate 9 m took 1620 J of work. What force was used, in newtons?
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, sandpaper 13 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
35. 35.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.⚖️ A seesaw balances. Arjun (720 N) sits ? m from the pivot on one side; Ravi (540 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
38. 38.Which of these is a pulley? (a) a steering wheel (b) a crowbar (c) a well-bucket rope wheel (d) a nut and bolt
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) powder on a carrom board (d) skating on ice
40. 40.True or false: a movable pulley only changes direction. (a) True (b) False

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