Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 649 · 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 cart is pulled to the right with 30 N and to the left with 15 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
2. 2.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) gravity (c) muscular force (d) friction
5. 5.True or false: a chisel is a lever. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) a chisel (b) an axe blade (c) a road up a hill (d) the tip of a nail
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
8. 8.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.True or false: a fixed pulley halves the effort. (a) False (b) True
10. 10.True or false: a wheelchair ramp is a lever. (a) False (b) True
11. 11.🏋️ A force of 50 N pushes a cart 9 m along the floor. How much work is done, in joules?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
13. 13.🪝 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
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
15. 15.Which of these is a pulley? (a) a wheelchair ramp (b) a truck loading ramp (c) a well-bucket rope wheel (d) a water tap handle
16. 16.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a wheelchair ramp (c) a road up a hill (d) a truck loading ramp
20. 20.Which of these is caused by muscular force? (a) a compass needle turns (b) an apple falls down (c) lifting a school bag (d) a river flows downhill
21. 21.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
22. 22.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
24. 24.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (110 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.💪 A bag has a mass of 24 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
26. 26.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 70 N. What is the size of the net force, in newtons?
27. 27.💪 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
28. 28.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
29. 29.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
30. 30.🏋️ Pushing a crate 8 m took 2560 J of work. What force was used, in newtons?
31. 31.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) pulley (c) lever (d) wedge
33. 33.💪 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?
34. 34.True or false: a wheelchair ramp is a wheel and axle. (a) True (b) False
35. 35.True or false: a tyre with deep treads gives less friction. (a) True (b) False
36. 36.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
37. 37.💪 Two children push a box to the right, one with 5 N and the other with 5 N. What is the net (total) force on the box, in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.🪝 A pulley system lifts a 720 N load with an effort of 240 N. What is its mechanical advantage (MA)?
40. 40.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load

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