Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 829 · 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: chalk on a gym bar? (a) less friction (b) more friction
2. 2.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
3. 3.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope
4. 4.True or false: pulling a cart is a pull. (a) True (b) False
5. 5.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) metre (m) (d) litre (L)
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
8. 8.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
9. 9.True or false: plucking a mango is a push. (a) True (b) False
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.🔍 Which is the odd one out? (a) a wood screw (b) a nut and bolt (c) a crowbar (d) a bottle cap
12. 12.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
13. 13.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 3 (d) 12
14. 14.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) gravity (d) friction
17. 17.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
19. 19.💪 Which force is at work: a rolling ball slows? (a) friction (b) muscular force (c) magnetic force (d) gravity
20. 20.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
22. 22.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
23. 23.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
24. 24.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.⚖️ A lever bar balances. The load is 20 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
27. 27.Which of these is a wheel and axle? (a) a bottle opener (b) a seesaw (c) a truck loading ramp (d) a well winch handle
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
29. 29.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
30. 30.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
31. 31.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
32. 32.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
33. 33.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
34. 34.True or false: drawing up a well bucket is a push. (a) True (b) False
35. 35.🏋️ A force of 60 N did 360 J of work. How many metres did the object move?
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wet tiled floor (d) sand on a slippery path
37. 37.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) muscular force (d) friction
38. 38.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the effort (d) the fulcrum
39. 39.True or false: a window blind cord is a pulley. (a) False (b) True
40. 40.🪝 A load of 420 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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