Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 774 · 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.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the fulcrum (d) on the rock
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
3. 3.True or false: a well winch handle is a wedge. (a) True (b) False
4. 4.True or false: a claw hammer on a nail is a pulley. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) an axe blade (c) the tip of a nail (d) a knife edge
6. 6.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 3 (d) 10
7. 7.🏋️ A force of 240 N pushes a cart 9 m along the floor. How much work is done, in joules?
8. 8.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
9. 9.⚖️ A seesaw balances. Zoya (200 N) sits ? m from the pivot on one side; Kabir (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
10. 10.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
11. 11.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a rough doormat (d) a tyre with deep treads
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.Which of these is caused by magnetic force? (a) squeezing a lemon (b) a magnet picks up pins (c) brakes stop a bicycle (d) a river flows downhill
14. 14.🏋️ Pushing a crate 6 m took 60 J of work. What force was used, in newtons?
15. 15.💪 A cart is pulled to the right with 30 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
17. 17.True or false: a fixed pulley only changes direction. (a) False (b) True
18. 18.Which of these is caused by gravity? (a) an apple falls down (b) a fridge magnet sticks (c) a rolling ball slows (d) brakes stop a bicycle
19. 19.🏋️ A force of 230 N did 1150 J of work. How many metres did the object move?
20. 20.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
21. 21.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
22. 22.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.True or false: a fixed pulley needs effort = load. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a flagpole rope wheel (d) a chisel
26. 26.💪 A cart is pulled to the right with 25 N and to the left with 10 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
27. 27.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
28. 28.🪝 A load of 340 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.⚖️ A seesaw balances. Asha (600 N) sits ? m from the pivot on one side; Kabir (450 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a smaller rod (axle) (d) a loose rope
33. 33.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
35. 35.🔍 Which is the odd one out? (a) a bottle opener (b) a crowbar (c) a window blind cord (d) a claw hammer on a nail
36. 36.🔍 Which is the odd one out? (a) an axe blade (b) a water tap handle (c) a steering wheel (d) a well winch handle
37. 37.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
38. 38.💪 Which force is at work: rain falls to the ground? (a) friction (b) magnetic force (c) muscular force (d) gravity
39. 39.⚖️ A lever bar balances. The load is 320 N at 40 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False

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