Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 789 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.Which of these is a screw? (a) a door stopper (b) a jar lid (c) a bottle opener (d) a steering wheel
3. 3.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
5. 5.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
6. 6.⚖️ A seesaw balances. Meena (320 N) sits 3 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
8. 8.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
10. 10.⚙️ Which simple machine is a wood screw? (a) lever (b) screw (c) wheel and axle (d) wedge
11. 11.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a rolling ball slows (c) squeezing a lemon (d) a magnet picks up pins
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
14. 14.💪 A cart is pulled to the right with 55 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
15. 15.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚙️ Which simple machine is a claw hammer on a nail? (a) wedge (b) pulley (c) wheel and axle (d) lever
17. 17.💪 A bag has a mass of 25 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
18. 18.True or false: a window blind cord is a wheel and axle. (a) False (b) True
19. 19.🏋️ A force of 440 N pushes a cart 7 m along the floor. How much work is done, in joules?
20. 20.True or false: a movable pulley needs effort = load. (a) True (b) False
21. 21.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.True or false: a crane hook block is a pulley. (a) False (b) True
24. 24.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) switch off gravity (d) make new energy
25. 25.Which of these is caused by magnetic force? (a) rain falls to the ground (b) brakes stop a bicycle (c) a fridge magnet sticks (d) pedalling a cycle
26. 26.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
27. 27.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
28. 28.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
29. 29.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
30. 30.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a smooth steel slide
31. 31.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
32. 32.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
33. 33.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
34. 34.⚖️ A seesaw balances. Kabir (160 N) sits ? m from the pivot on one side; Zoya (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wheel on ball bearings
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
39. 39.🔍 Which is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) the tip of a nail (d) a well-bucket rope wheel
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice

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