Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 318 · 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 bag has a mass of 43 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
3. 3.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Meena (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
5. 5.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a truck loading ramp (d) a round doorknob
6. 6.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) gravity (c) magnetic force (d) friction
7. 7.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
10. 10.⚙️ Which simple machine is a jar lid? (a) inclined plane (b) screw (c) lever (d) wedge
11. 11.🔍 Which is the odd one out? (a) a chisel (b) a well winch handle (c) a steering wheel (d) a water tap handle
12. 12.True or false: a jar lid is a screw. (a) False (b) True
13. 13.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
14. 14.True or false: a steering wheel is a lever. (a) True (b) False
15. 15.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
16. 16.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
17. 17.True or false: a tyre with deep treads gives more friction. (a) True (b) False
18. 18.🏋️ A force of 190 N pushes a cart 4 m along the floor. How much work is done, in joules?
19. 19.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.💪 A cart is pulled to the right with 95 N and to the left with 90 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
21. 21.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
22. 22.🛞 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 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
23. 23.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
24. 24.⚙️ Which simple machine is a steering wheel? (a) lever (b) pulley (c) screw (d) wheel and axle
25. 25.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
26. 26.⚙️ Which simple machine is a door stopper? (a) wedge (b) pulley (c) inclined plane (d) screw
27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
28. 28.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
29. 29.True or false: a smooth steel slide gives less friction. (a) True (b) False
30. 30.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
31. 31.True or false: a fixed pulley needs effort = load. (a) False (b) True
32. 32.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
33. 33.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a road up a hill (c) a bottle cap (d) a playground slide
34. 34.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
36. 36.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
37. 37.💪 A bag has a mass of 42 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
38. 38.🏋️ Pushing a crate 1 m took 110 J of work. What force was used, in newtons?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion

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