Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 855 · 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 movable pulley is on a flagpole top. (a) True (b) False
2. 2.⚖️ A seesaw balances. Zoya (240 N) sits 3 m from the pivot on one side; Asha (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.Which of these is a screw? (a) a screw jack (b) a playground slide (c) a knife edge (d) a well-bucket rope wheel
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a bent lever (d) a tiny pulley
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
10. 10.Which of these is caused by magnetic force? (a) rain falls to the ground (b) lifting a school bag (c) a magnet picks up pins (d) an apple falls down
11. 11.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
12. 12.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
13. 13.💪 A force is a … (a) push or a pull (b) kind of colour (c) unit of time (d) type of sound
14. 14.🪝 A pulley system lifts a 600 N load with an effort of 150 N. What is its mechanical advantage (MA)?
15. 15.⚖️ A seesaw balances. Meena (360 N) sits ? m from the pivot on one side; Arjun (360 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
16. 16.True or false: a wet tiled floor gives less friction. (a) True (b) False
17. 17.🏋️ Pushing a crate 7 m took 2450 J of work. What force was used, in newtons?
18. 18.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
19. 19.True or false: a jar lid is a screw. (a) True (b) False
20. 20.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
22. 22.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
23. 23.⚖️ A seesaw balances. Zoya (450 N) sits 1 m from the pivot on one side; Arjun (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.💪 A cart is pulled to the right with 40 N and to the left with 30 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
25. 25.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
26. 26.True or false: a steering wheel is a screw. (a) True (b) False
27. 27.🪝 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
28. 28.Which of these is a lever? (a) a door stopper (b) a chisel (c) a window blind cord (d) a crowbar
29. 29.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
30. 30.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
31. 31.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) powder on a carrom board (d) sand on a slippery path
32. 32.🏋️ A force of 270 N did 270 J of work. How many metres did the object move?
33. 33.⚖️ A seesaw balances. Zoya (440 N) sits 4 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1280 N bucket on the axle, in newtons? (ideal)
35. 35.🔍 Which is the odd one out? (a) a screw jack (b) a nut and bolt (c) a crane hook block (d) a wood screw
36. 36.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
37. 37.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Arjun (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.💪 A bag has a mass of 1 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?

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