Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 981 · 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 bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
3. 3.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the colour of rope (d) the size of the load
4. 4.Which of these is a screw? (a) a crowbar (b) a truck loading ramp (c) a wood screw (d) a bottle opener
5. 5.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
6. 6.🏋️ Pushing a crate 2 m took 580 J of work. What force was used, in newtons?
7. 7.💪 Which force is at work: an apple falls down? (a) gravity (b) magnetic force (c) friction (d) muscular force
8. 8.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
9. 9.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) friction (c) gravity (d) magnetic force
10. 10.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
11. 11.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
14. 14.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.⚙️ Which simple machine is a wheelchair ramp? (a) wheel and axle (b) pulley (c) inclined plane (d) screw
16. 16.🏋️ A force of 180 N pushes a cart 9 m along the floor. How much work is done, in joules?
17. 17.Which of these is caused by gravity? (a) a rolling ball slows (b) rain falls to the ground (c) brakes stop a bicycle (d) shoes grip the floor
18. 18.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
19. 19.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
21. 21.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
22. 22.⚖️ A lever bar balances. The load is 240 N at 10 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?
23. 23.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
24. 24.Which of these is caused by friction? (a) rain falls to the ground (b) lifting a school bag (c) shoes grip the floor (d) pedalling a cycle
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a box pushed on carpet (d) a tyre with deep treads
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
28. 28.True or false: plucking a mango is a pull. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
30. 30.🏋️ A force of 10 N did 20 J of work. How many metres did the object move?
31. 31.⚖️ 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 1 (b) class 2 (c) class 3
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
33. 33.🏋️ A force of 360 N did 360 J of work. How many metres did the object move?
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.True or false: a wood screw is a wedge. (a) False (b) True
36. 36.🏋️ Pushing a crate 6 m took 2640 J of work. What force was used, in newtons?
37. 37.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
38. 38.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
39. 39.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Ravi (190 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.True or false: sand on a slippery path gives more friction. (a) True (b) False

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