Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 648 · 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 wheelchair ramp is an inclined plane. (a) False (b) True
2. 2.Which of these is an inclined plane? (a) a water tap handle (b) a nutcracker (c) a window blind cord (d) a road up a hill
3. 3.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
4. 4.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
5. 5.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts an 850 N bucket on the axle, in newtons? (ideal)
6. 6.⚙️ Which simple machine is a jar lid? (a) screw (b) wheel and axle (c) inclined plane (d) pulley
7. 7.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 380 N bucket on the axle, in newtons? (ideal)
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
9. 9.True or false: a well-bucket rope wheel is a wheel and axle. (a) True (b) False
10. 10.⚖️ A seesaw balances. Ravi (600 N) sits 1 m from the pivot on one side; Meena (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
12. 12.🪝 A pulley system lifts a 540 N load with an effort of 270 N. What is its mechanical advantage (MA)?
13. 13.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
14. 14.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (330 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.🏋️ A force of 340 N did 3060 J of work. How many metres did the object move?
17. 17.⚙️ Which simple machine is a bottle cap? (a) screw (b) wheel and axle (c) pulley (d) lever
18. 18.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
19. 19.Which of these is caused by gravity? (a) brakes stop a bicycle (b) squeezing a lemon (c) shoes grip the floor (d) rain falls to the ground
20. 20.True or false: a wheelchair ramp is a wheel and axle. (a) True (b) False
21. 21.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.⚖️ A lever bar balances. The load is 200 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
25. 25.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
26. 26.⚙️ Which simple machine is a steering wheel? (a) pulley (b) wheel and axle (c) screw (d) lever
27. 27.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🔍 Which is the odd one out? (a) the tip of a nail (b) a crowbar (c) a nutcracker (d) a seesaw
29. 29.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
30. 30.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
31. 31.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
32. 32.💪 Two children push a box to the right, one with 80 N and the other with 70 N. What is the net (total) force on the box, in newtons?
33. 33.True or false: hitting a cricket ball is a pull. (a) True (b) False
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
36. 36.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
37. 37.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.⚖️ A lever bar balances. The load is 540 N at ? cm from the fulcrum. The effort is 300 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.⚖️ A seesaw balances. Kabir (300 N) sits 3 m from the pivot on one side; Arjun (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber

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