Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 696 · 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.💪 Two children push a box to the right, one with 85 N and the other with 30 N. What is the net (total) force on the box, in newtons?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
5. 5.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
6. 6.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
7. 7.🏋️ Pushing a crate 2 m took 780 J of work. What force was used, in newtons?
8. 8.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
9. 9.💪 Two children push a box to the right, one with 10 N and the other with 85 N. What is the net (total) force on the box, in newtons?
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
11. 11.True or false: a movable pulley needs effort = load. (a) True (b) False
12. 12.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
13. 13.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
14. 14.True or false: pushing a trolley is a pull. (a) False (b) True
15. 15.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
17. 17.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
19. 19.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) friction (c) magnetic force (d) muscular force
20. 20.🪝 A pulley system lifts a 560 N load with an effort of 140 N. What is its mechanical advantage (MA)?
21. 21.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
22. 22.🏋️ A force of 80 N pushes a cart 6 m along the floor. How much work is done, in joules?
23. 23.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
24. 24.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
26. 26.True or false: a grippy rubber sole gives less friction. (a) True (b) False
27. 27.True or false: a fixed pulley only changes direction. (a) True (b) False
28. 28.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
29. 29.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
30. 30.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
32. 32.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a wheel on ball bearings (d) oil on a squeaky hinge
34. 34.Which of these is an inclined plane? (a) a round doorknob (b) a jar lid (c) a steering wheel (d) a road up a hill
35. 35.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
36. 36.💪 A box weighs 220 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
38. 38.⚙️ Which simple machine is a door stopper? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
39. 39.💪 A force is a … (a) type of sound (b) push or a pull (c) kind of colour (d) unit of time
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2

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