Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 127 · 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.⚖️ A seesaw balances. Ravi (180 N) sits 2 m from the pivot on one side; Meena (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 80 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
6. 6.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
7. 7.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.Which of these is caused by magnetic force? (a) shoes grip the floor (b) rubbing hands warms them (c) a fridge magnet sticks (d) rain falls to the ground
9. 9.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
10. 10.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) friction (d) magnetism
11. 11.🏋️ A force of 350 N pushes a cart 1 m along the floor. How much work is done, in joules?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🏋️ A force of 430 N pushes a cart 7 m along the floor. How much work is done, in joules?
14. 14.True or false: a fixed pulley rises with the load. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a window blind cord (b) a well winch handle (c) a well-bucket rope wheel (d) a flagpole rope wheel
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🔍 Which is the odd one out? (a) a crane hook block (b) a round doorknob (c) a window blind cord (d) a well-bucket rope wheel
18. 18.🛞 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 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.🏋️ A force of 220 N pushes a cart 2 m along the floor. How much work is done, in joules?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
23. 23.True or false: a fixed pulley only changes direction. (a) True (b) False
24. 24.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
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 8 N, a carpet 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
27. 27.⚙️ Which simple machine is an axe blade? (a) inclined plane (b) wheel and axle (c) screw (d) wedge
28. 28.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
29. 29.True or false: pulling up your socks is a pull. (a) False (b) True
30. 30.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
31. 31.True or false: pushing a swing is a pull. (a) False (b) True
32. 32.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) powder on a carrom board (d) oil on a squeaky hinge
34. 34.True or false: a road up a hill is an inclined plane. (a) False (b) True
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
37. 37.🔍 Which is the odd one out? (a) a chisel (b) an axe blade (c) a crowbar (d) a knife edge
38. 38.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a round doorknob (d) a claw hammer on a nail

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