Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 572 · 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 well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
2. 2.True or false: a movable pulley needs effort = load. (a) False (b) True
3. 3.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
4. 4.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
5. 5.💪 A bag has a mass of 22 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.💪 A cart is pulled to the right with 60 N and to the left with 60 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
7. 7.True or false: a tug of war is a push. (a) False (b) True
8. 8.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
9. 9.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
11. 11.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
13. 13.True or false: pushing a swing is a push. (a) False (b) True
14. 14.💪 A cart is pulled to the right with 55 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
15. 15.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
17. 17.True or false: a truck loading ramp is an inclined plane. (a) False (b) True
18. 18.⚖️ A seesaw balances. Ravi (220 N) sits ? m from the pivot on one side; Arjun (440 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
19. 19.True or false: closing a drawer is a push. (a) False (b) True
20. 20.🏋️ A machine lifts a load of 760 N when you push with 190 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 wooden plank 5 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🏋️ A force of 410 N did 3280 J of work. How many metres did the object move?
23. 23.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
26. 26.⚖️ A seesaw balances. Asha (320 N) sits 2 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
28. 28.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) skating on ice (d) a grippy rubber sole
33. 33.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
34. 34.Which of these is caused by gravity? (a) a thrown ball comes down (b) squeezing a lemon (c) a compass needle turns (d) lifting a school bag
35. 35.Which of these is caused by muscular force? (a) an apple falls down (b) a river flows downhill (c) a rolling ball slows (d) squeezing a lemon
36. 36.🔍 Which is the odd one out? (a) a knife edge (b) a chisel (c) a jar lid (d) an axe blade
37. 37.True or false: a chisel is a wedge. (a) True (b) False
38. 38.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
39. 39.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
40. 40.🏋️ A force of 140 N pushes a cart 5 m along the floor. How much work is done, in joules?

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