Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 534 · 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 force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.True or false: closing a drawer is a push. (a) True (b) False
4. 4.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
5. 5.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
6. 6.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Asha (640 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
10. 10.🪝 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)
11. 11.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a round doorknob (b) a well winch handle (c) a seesaw (d) a water tap handle
13. 13.True or false: a movable pulley stays in one place. (a) False (b) True
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
16. 16.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
17. 17.🪝 A pulley system lifts an 870 N load with an effort of 290 N. What is its mechanical advantage (MA)?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
19. 19.🛞 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 carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
20. 20.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
21. 21.Which of these is a pulley? (a) a wheelchair ramp (b) a crane hook block (c) a wood screw (d) a nut and bolt
22. 22.🏋️ A force of 270 N pushes a cart 1 m along the floor. How much work is done, in joules?
23. 23.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) friction (c) magnetic force (d) gravity
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
25. 25.🏋️ A force of 320 N pushes a cart 9 m along the floor. How much work is done, in joules?
26. 26.🏋️ A force of 220 N pushes a cart 2 m along the floor. How much work is done, in joules?
27. 27.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
28. 28.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
30. 30.🔍 Which is the odd one out? (a) a well winch handle (b) a round doorknob (c) a steering wheel (d) a well-bucket rope wheel
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
32. 32.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
34. 34.True or false: kicking a football is a pull. (a) True (b) False
35. 35.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
36. 36.🏋️ Pushing a crate 3 m took 360 J of work. What force was used, in newtons?
37. 37.⚖️ A seesaw balances. Meena (130 N) sits ? m from the pivot on one side; Ravi (520 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚙️ Which simple machine is a well-bucket rope wheel? (a) inclined plane (b) wheel and axle (c) wedge (d) pulley
39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
40. 40.⚙️ Which simple machine is a nutcracker? (a) screw (b) lever (c) inclined plane (d) pulley

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