Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 457 · 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 seesaw balances. Meena (440 N) sits ? m from the pivot on one side; Ravi (330 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
2. 2.True or false: sand on a slippery path gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
4. 4.💪 A cart is pulled to the right with 75 N and to the left with 85 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
5. 5.⚖️ A seesaw balances. Ravi (190 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.Which of these is caused by muscular force? (a) rubbing hands warms them (b) a rolling ball slows (c) a river flows downhill (d) lifting a school bag
7. 7.⚙️ Which simple machine is a knife edge? (a) screw (b) wheel and axle (c) inclined plane (d) wedge
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) oil on a squeaky hinge (d) chalk on a gym bar
9. 9.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
10. 10.True or false: a movable pulley only changes direction. (a) True (b) False
11. 11.Which of these is a lever? (a) a screw jack (b) a wheelchair ramp (c) a well-bucket rope wheel (d) a crowbar
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.💪 A box weighs 50 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
14. 14.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
15. 15.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
16. 16.💪 Two children push a box to the right, one with 55 N and the other with 55 N. What is the net (total) force on the box, in newtons?
17. 17.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
18. 18.True or false: a steering wheel is a wheel and axle. (a) True (b) False
19. 19.🪝 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
20. 20.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
21. 21.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
22. 22.Which of these is caused by friction? (a) lifting a school bag (b) a magnet picks up pins (c) rain falls to the ground (d) shoes grip the floor
23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
24. 24.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
25. 25.💪 Two children push a box to the right, one with 90 N and the other with 40 N. What is the net (total) force on the box, in newtons?
26. 26.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True
27. 27.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wedge (c) screw (d) wheel and axle
28. 28.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
29. 29.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
30. 30.💪 Two children push a box to the right, one with 95 N and the other with 40 N. What is the net (total) force on the box, in newtons?
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
34. 34.True or false: a playground slide is a lever. (a) False (b) True
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) oil on a squeaky hinge (d) skating on ice
37. 37.⚖️ A seesaw balances. Asha (120 N) sits 2 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
40. 40.⚙️ Which simple machine is a chisel? (a) inclined plane (b) wedge (c) lever (d) screw

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