Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 414 · 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 well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🏋️ 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
4. 4.⚙️ Which simple machine is a knife edge? (a) screw (b) wedge (c) pulley (d) lever
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
6. 6.⚙️ Which simple machine is a road up a hill? (a) lever (b) wedge (c) pulley (d) inclined plane
7. 7.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 350 N bucket on the axle, in newtons? (ideal)
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
9. 9.🔍 Which is the odd one out? (a) a bottle opener (b) a claw hammer on a nail (c) a nut and bolt (d) a seesaw
10. 10.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
11. 11.🏋️ A force of 300 N did 2100 J of work. How many metres did the object move?
12. 12.🏋️ A force of 250 N pushes a cart 3 m along the floor. How much work is done, in joules?
13. 13.⚙️ Which simple machine is a playground slide? (a) wheel and axle (b) screw (c) pulley (d) inclined plane
14. 14.Which of these is a lever? (a) a claw hammer on a nail (b) a screw jack (c) a flagpole rope wheel (d) a knife edge
15. 15.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
16. 16.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Kabir (560 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🏋️ Pushing a crate 5 m took 1250 J of work. What force was used, in newtons?
18. 18.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
19. 19.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
20. 20.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, a carpet 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
22. 22.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
23. 23.True or false: pulling up your socks is a pull. (a) False (b) True
24. 24.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.True or false: pulling a cart is a push. (a) True (b) False
26. 26.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
27. 27.Which of these is a screw? (a) a wheelchair ramp (b) an axe blade (c) a crowbar (d) a screw jack
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
30. 30.⚙️ Which simple machine is the tip of a nail? (a) wheel and axle (b) wedge (c) screw (d) pulley
31. 31.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
33. 33.🛞 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, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
34. 34.⚖️ A seesaw balances. Ravi (360 N) sits 3 m from the pivot on one side; Kabir (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
37. 37.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
38. 38.🏋️ Pushing a crate 2 m took 600 J of work. What force was used, in newtons?
39. 39.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
40. 40.⚖️ A seesaw balances. Asha (200 N) sits ? m from the pivot on one side; Meena (800 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?

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