Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 9 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
2. 2.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (800 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🏋️ Pushing a crate 6 m took 2100 J of work. What force was used, in newtons?
4. 4.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
5. 5.⚖️ A seesaw balances. Ravi (140 N) sits 2 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.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
7. 7.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) switch off gravity (d) make new energy
8. 8.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) inclined plane (c) wheel and axle (d) pulley
9. 9.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) unbalanced (c) doubled (d) balanced
10. 10.Which of these is a wheel and axle? (a) a round doorknob (b) a wood screw (c) a nut and bolt (d) a truck loading ramp
11. 11.⚖️ A lever bar balances. The load is 640 N at 50 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.💪 Two children push a box to the right, one with 40 N and the other with 35 N. What is the net (total) force on the box, in newtons?
13. 13.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
14. 14.🏋️ A force of 250 N pushes a cart 7 m along the floor. How much work is done, in joules?
15. 15.🔍 Which is the odd one out? (a) a road up a hill (b) a seesaw (c) a crowbar (d) a bottle opener
16. 16.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
17. 17.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
18. 18.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope
19. 19.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
20. 20.💪 Two children push a box to the right, one with 65 N and the other with 55 N. What is the net (total) force on the box, in newtons?
21. 21.💪 A cart is pulled to the right with 35 N and to the left with 25 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
25. 25.🏋️ A force of 330 N pushes a cart 7 m along the floor. How much work is done, in joules?
26. 26.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wedge (c) lever (d) wheel and axle
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a tyre with deep treads (d) chalk on a gym bar
28. 28.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
29. 29.⚖️ A seesaw balances. Ravi (360 N) sits 2 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?
30. 30.🪝 A pulley system lifts a 400 N load with an effort of 200 N. What is its mechanical advantage (MA)?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.💪 Two children push a box to the right, one with 45 N and the other with 20 N. What is the net (total) force on the box, in newtons?
33. 33.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
34. 34.True or false: pushing a trolley is a push. (a) False (b) True
35. 35.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
36. 36.🏋️ A force of 160 N did 800 J of work. How many metres did the object move?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
39. 39.⚖️ A lever bar balances. The load is 420 N at 40 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?
40. 40.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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