Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 518 · 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.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) powder on a carrom board (d) oil on a squeaky hinge
3. 3.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
4. 4.⚖️ A lever bar balances. The load is 540 N at 50 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.⚙️ Which simple machine is a water tap handle? (a) inclined plane (b) lever (c) wheel and axle (d) wedge
6. 6.Which of these is caused by magnetic force? (a) shoes grip the floor (b) pedalling a cycle (c) a fridge magnet sticks (d) a river flows downhill
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) powder on a carrom board (d) a smooth steel slide
8. 8.💪 In a tug of war, one team pulls left with 20 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
9. 9.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
10. 10.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
11. 11.True or false: drawing up a well bucket is a push. (a) False (b) True
12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)
13. 13.⚖️ A lever bar balances. The load is 270 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
16. 16.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
17. 17.⚙️ Which simple machine is a flagpole rope wheel? (a) inclined plane (b) wedge (c) pulley (d) wheel and axle
18. 18.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
19. 19.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the pulley (d) the load
20. 20.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
21. 21.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) gravity (d) friction
22. 22.⚙️ Which simple machine is a nut and bolt? (a) wedge (b) screw (c) lever (d) inclined plane
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
24. 24.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
27. 27.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 3 (d) 10
28. 28.⚖️ A seesaw balances. Asha (420 N) sits 3 m from the pivot on one side; Ravi (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
29. 29.True or false: a movable pulley halves the effort. (a) False (b) True
30. 30.⚖️ A lever bar balances. The load is 270 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.⚙️ Which simple machine is a seesaw? (a) wedge (b) lever (c) pulley (d) screw
32. 32.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) oil on a squeaky hinge (d) a wheel on ball bearings
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.⚖️ A lever bar balances. The load is 500 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?
35. 35.🏋️ A force of 220 N pushes a cart 9 m along the floor. How much work is done, in joules?
36. 36.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
37. 37.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.Which of these is a wedge? (a) a door stopper (b) a crowbar (c) a well-bucket rope wheel (d) a window blind cord
39. 39.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.🏋️ Pushing a crate 4 m took 1160 J of work. What force was used, in newtons?

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