Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 239 · 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.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
2. 2.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a smooth steel slide (d) a grippy rubber sole
4. 4.True or false: a grippy rubber sole gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) an axe blade (b) a crane hook block (c) a window blind cord (d) a flagpole rope wheel
6. 6.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
7. 7.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
9. 9.True or false: the tip of a nail is a wedge. (a) False (b) True
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 55 N. What is the size of the net force, in newtons?
12. 12.⚖️ A seesaw balances. Ravi (540 N) sits 1 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.True or false: a steering wheel is a wheel and axle. (a) False (b) True
14. 14.Which of these is a wheel and axle? (a) a round doorknob (b) a road up a hill (c) a nut and bolt (d) an axe blade
15. 15.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (190 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
18. 18.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
19. 19.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
20. 20.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
21. 21.💪 In a tug of war, one team pulls left with 15 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
22. 22.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
23. 23.True or false: a water tap handle is a wheel and axle. (a) False (b) True
24. 24.🏋️ A force of 10 N pushes a cart 4 m along the floor. How much work is done, in joules?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a movable pulley needs effort = load. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a rough doormat
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
30. 30.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
31. 31.True or false: kicking a football is a push. (a) False (b) True
32. 32.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
33. 33.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
34. 34.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
35. 35.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a rope on a wheel (d) a wheel on a rod
36. 36.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
37. 37.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
40. 40.⚙️ Which simple machine is an axe blade? (a) lever (b) wheel and axle (c) pulley (d) wedge

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