Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 729 · 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 pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
2. 2.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the pulley
3. 3.Which of these is a wedge? (a) a wheelchair ramp (b) a truck loading ramp (c) a knife edge (d) a road up a hill
4. 4.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
6. 6.🏋️ Pushing a crate 9 m took 540 J of work. What force was used, in newtons?
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🪝 A pulley system lifts a 690 N load with an effort of 230 N. What is its mechanical advantage (MA)?
9. 9.Which of these is an inclined plane? (a) a bottle cap (b) a well winch handle (c) a claw hammer on a nail (d) a wheelchair ramp
10. 10.True or false: closing a drawer is a push. (a) False (b) True
11. 11.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
12. 12.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
13. 13.⚖️ A seesaw balances. Asha (400 N) sits 4 m from the pivot on one side; Meena (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Zoya (180 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.⚙️ Which simple machine is a bottle opener? (a) wedge (b) lever (c) inclined plane (d) screw
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) sand on a slippery path (d) chalk on a gym bar
19. 19.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) switch off gravity (d) use a smaller force
20. 20.True or false: a water tap handle is a wheel and axle. (a) False (b) True
21. 21.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
22. 22.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
25. 25.True or false: a smooth steel slide gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
28. 28.⚖️ A seesaw balances. Zoya (110 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚙️ Which simple machine is a road up a hill? (a) wedge (b) inclined plane (c) pulley (d) lever
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
34. 34.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
35. 35.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
36. 36.True or false: a round doorknob is a wheel and axle. (a) True (b) False
37. 37.True or false: a fixed pulley stays in one place. (a) True (b) False
38. 38.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 770 N bucket on the axle, in newtons? (ideal)
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
40. 40.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley

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