Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 149 · 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 pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
2. 2.Which of these is caused by muscular force? (a) squeezing a lemon (b) a thrown ball comes down (c) a rolling ball slows (d) brakes stop a bicycle
3. 3.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
7. 7.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
8. 8.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
9. 9.True or false: a steering wheel is a lever. (a) False (b) True
10. 10.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
11. 11.⚙️ Which simple machine is a window blind cord? (a) wedge (b) pulley (c) inclined plane (d) wheel and axle
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
13. 13.💪 A bag has a mass of 20 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
14. 14.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
16. 16.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
17. 17.True or false: skating on ice gives more friction. (a) False (b) True
18. 18.⚙️ Which simple machine is a screw jack? (a) screw (b) inclined plane (c) wedge (d) pulley
19. 19.Which of these is a wedge? (a) a playground slide (b) a nut and bolt (c) the tip of a nail (d) a flagpole rope wheel
20. 20.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
21. 21.🏋️ A force of 250 N pushes a cart 5 m along the floor. How much work is done, in joules?
22. 22.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
23. 23.⚖️ A lever bar balances. The load is 560 N at 20 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?
24. 24.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
25. 25.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
26. 26.True or false: a fixed pulley only changes direction. (a) True (b) False
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
28. 28.💪 Two children push a box to the right, one with 35 N and the other with 100 N. What is the net (total) force on the box, in newtons?
29. 29.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
32. 32.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
33. 33.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
34. 34.True or false: drawing up a well bucket is a pull. (a) True (b) False
35. 35.⚖️ A lever bar balances. The load is 240 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?
36. 36.Which of these is caused by magnetic force? (a) rain falls to the ground (b) squeezing a lemon (c) rubbing hands warms them (d) a fridge magnet sticks
37. 37.💪 A cart is pulled to the right with 70 N and to the left with 65 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
38. 38.Which of these is caused by gravity? (a) a fridge magnet sticks (b) rain falls to the ground (c) pedalling a cycle (d) a rolling ball slows
39. 39.True or false: chalk on a gym bar gives more friction. (a) True (b) False
40. 40.🏋️ A force of 340 N did 3060 J of work. How many metres did the object move?

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