Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 83 · 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.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
2. 2.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) balanced (d) unbalanced
3. 3.True or false: opening a drawer is a push. (a) True (b) False
4. 4.True or false: a nutcracker is an inclined plane. (a) True (b) False
5. 5.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
6. 6.Which of these is a lever? (a) a crowbar (b) a well-bucket rope wheel (c) a door stopper (d) a truck loading ramp
7. 7.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
10. 10.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
11. 11.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
12. 12.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
13. 13.💪 A cart is pulled to the right with 45 N and to the left with 30 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
15. 15.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
16. 16.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a wet tiled floor (d) sand on a slippery path
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.⚙️ Which simple machine is a screw jack? (a) pulley (b) wedge (c) screw (d) wheel and axle
20. 20.Which of these is a screw? (a) the tip of a nail (b) a nut and bolt (c) a window blind cord (d) a knife edge
21. 21.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
22. 22.🏋️ A force of 350 N pushes a cart 8 m along the floor. How much work is done, in joules?
23. 23.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
24. 24.True or false: a fixed pulley needs effort = load. (a) False (b) True
25. 25.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
26. 26.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the fulcrum (d) the load
27. 27.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
28. 28.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a smooth steel slide (d) a tyre with deep treads
30. 30.True or false: a nutcracker is a lever. (a) False (b) True
31. 31.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
32. 32.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
34. 34.💪 In a tug of war, one team pulls right with 55 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
35. 35.⚖️ A lever bar balances. The load is 900 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.💪 Two children push a box to the right, one with 70 N and the other with 50 N. What is the net (total) force on the box, in newtons?
37. 37.⚙️ Which simple machine is a window blind cord? (a) pulley (b) lever (c) screw (d) inclined plane
38. 38.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
39. 39.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
40. 40.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?

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