Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 936 · 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: a wheel on ball bearings? (a) less friction (b) more friction
2. 2.💪 Which force is at work: a magnet picks up pins? (a) friction (b) magnetic force (c) muscular force (d) gravity
3. 3.💪 Two children push a box to the right, one with 35 N and the other with 20 N. What is the net (total) force on the box, in newtons?
4. 4.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) newton (N) (d) metre (m)
5. 5.⚖️ A seesaw balances. Meena (180 N) sits ? m from the pivot on one side; Arjun (540 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🪝 A bucket weighing 400 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 600 N at ? cm from the fulcrum. The effort is 180 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a fridge magnet sticks (c) squeezing a lemon (d) brakes stop a bicycle
10. 10.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
11. 11.💪 A force is a … (a) type of sound (b) kind of colour (c) push or a pull (d) unit of time
12. 12.💪 A box weighs 160 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
13. 13.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
14. 14.⚙️ Which simple machine is a knife edge? (a) pulley (b) inclined plane (c) wheel and axle (d) wedge
15. 15.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a nut and bolt (d) a window blind cord
17. 17.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
18. 18.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) unbalanced (d) gravity
19. 19.💪 Which force is at work: lifting a school bag? (a) friction (b) muscular force (c) gravity (d) magnetic force
20. 20.Which of these is caused by friction? (a) an apple falls down (b) pedalling a cycle (c) brakes stop a bicycle (d) a fridge magnet sticks
21. 21.Which of these is caused by muscular force? (a) lifting a school bag (b) an apple falls down (c) shoes grip the floor (d) a magnet picks up pins
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
24. 24.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
25. 25.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a smooth steel slide (d) oil on a squeaky hinge
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
29. 29.💪 Which force is at work: a river flows downhill? (a) gravity (b) friction (c) magnetic force (d) muscular force
30. 30.⚖️ A seesaw balances. Arjun (190 N) sits 3 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.💪 Two children push a box to the right, one with 40 N and the other with 70 N. What is the net (total) force on the box, in newtons?
32. 32.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
33. 33.🏋️ Pushing a crate 3 m took 1500 J of work. What force was used, in newtons?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
35. 35.True or false: skating on ice gives more friction. (a) False (b) True
36. 36.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the effort (d) the fulcrum
38. 38.True or false: a nutcracker is a wheel and axle. (a) True (b) False
39. 39.⚖️ A lever bar balances. The load is 320 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.Which of these is caused by gravity? (a) a rolling ball slows (b) pedalling a cycle (c) shoes grip the floor (d) a thrown ball comes down

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