Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 214 · 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.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
2. 2.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
4. 4.🏋️ A force of 370 N pushes a cart 5 m along the floor. How much work is done, in joules?
5. 5.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.Which of these is a lever? (a) a wood screw (b) a road up a hill (c) a steering wheel (d) a nutcracker
7. 7.⚖️ A lever bar balances. The load is 80 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
9. 9.⚖️ A lever bar balances. The load is 210 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
12. 12.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
15. 15.🏋️ Pushing a crate 8 m took 960 J of work. What force was used, in newtons?
16. 16.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
17. 17.🏋️ Pushing a crate 3 m took 570 J of work. What force was used, in newtons?
18. 18.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
19. 19.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
20. 20.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 260 N bucket on the axle, in newtons? (ideal)
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
23. 23.🏋️ Pushing a crate 6 m took 2340 J of work. What force was used, in newtons?
24. 24.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
25. 25.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
26. 26.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🛞 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, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
29. 29.⚖️ A seesaw balances. Asha (420 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
31. 31.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) wheel and axle (c) lever (d) inclined plane
32. 32.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
33. 33.⚙️ Which simple machine is a door stopper? (a) pulley (b) lever (c) screw (d) wedge
34. 34.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
35. 35.True or false: a door stopper is a pulley. (a) False (b) True
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
38. 38.💪 Two children push a box to the right, one with 85 N and the other with 90 N. What is the net (total) force on the box, in newtons?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.🏋️ A force of 430 N did 4300 J of work. How many metres did the object move?

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