Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 624 · 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 wheel on ball bearings gives more friction. (a) True (b) False
2. 2.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
4. 4.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
5. 5.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) doubled (d) balanced
6. 6.Which of these is caused by magnetic force? (a) squeezing a lemon (b) shoes grip the floor (c) brakes stop a bicycle (d) a magnet picks up pins
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
8. 8.⚖️ A seesaw balances. Kabir (140 N) sits 3 m from the pivot on one side; Asha (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
10. 10.⚖️ A seesaw balances. Meena (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?
11. 11.True or false: a wet tiled floor gives less friction. (a) False (b) True
12. 12.True or false: a movable pulley needs effort = load. (a) False (b) True
13. 13.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) magnetic force (d) friction
14. 14.Which of these is a screw? (a) a crowbar (b) a nut and bolt (c) a steering wheel (d) a round doorknob
15. 15.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
16. 16.⚖️ A lever bar balances. The load is 120 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.⚙️ Which simple machine is a knife edge? (a) pulley (b) wedge (c) wheel and axle (d) lever
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
19. 19.⚙️ Which simple machine is a door stopper? (a) wedge (b) pulley (c) screw (d) lever
20. 20.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
21. 21.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
23. 23.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
24. 24.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
25. 25.💪 A cart is pulled to the right with 85 N and to the left with 85 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
26. 26.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
27. 27.⚙️ Which simple machine is a round doorknob? (a) pulley (b) wheel and axle (c) screw (d) inclined plane
28. 28.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
29. 29.💪 Which force is at work: rain falls to the ground? (a) gravity (b) muscular force (c) friction (d) magnetic force
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
31. 31.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Zoya (420 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.⚖️ A lever bar balances. The load is 420 N at 20 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
34. 34.True or false: pressing a doorbell is a push. (a) True (b) False
35. 35.💪 Two children push a box to the right, one with 70 N and the other with 5 N. What is the net (total) force on the box, in newtons?
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
38. 38.⚙️ Which simple machine is a jar lid? (a) inclined plane (b) screw (c) pulley (d) wedge
39. 39.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat
40. 40.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves

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