Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 580 · 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 lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 60 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
3. 3.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
5. 5.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.⚖️ A lever bar balances. The load is 700 N at 30 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 300 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
10. 10.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
11. 11.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
12. 12.🏋️ Pushing a crate 3 m took 510 J of work. What force was used, in newtons?
13. 13.🔍 Which is the odd one out? (a) an axe blade (b) a wheelchair ramp (c) the tip of a nail (d) a chisel
14. 14.💪 A cart is pulled to the right with 20 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.⚙️ Which simple machine is a playground slide? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
17. 17.🏋️ A force of 150 N pushes a cart 1 m along the floor. How much work is done, in joules?
18. 18.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
19. 19.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.⚙️ Which simple machine is a door stopper? (a) wedge (b) lever (c) screw (d) pulley
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
22. 22.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
23. 23.True or false: a fixed pulley halves the effort. (a) True (b) False
24. 24.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
25. 25.🏋️ A force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
26. 26.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
27. 27.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
28. 28.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
30. 30.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
31. 31.Which of these is a lever? (a) a truck loading ramp (b) a well-bucket rope wheel (c) a wheelchair ramp (d) a seesaw
32. 32.⚖️ A lever bar balances. The load is 800 N at 40 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.True or false: a smooth steel slide gives more friction. (a) False (b) True
34. 34.Which of these is caused by gravity? (a) brakes stop a bicycle (b) a compass needle turns (c) rain falls to the ground (d) lifting a school bag
35. 35.True or false: pulling up your socks is a push. (a) False (b) True
36. 36.True or false: a wood screw is a screw. (a) True (b) False
37. 37.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
39. 39.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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