Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 368 · 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.💪 Two children push a box to the right, one with 90 N and the other with 15 N. What is the net (total) force on the box, in newtons?
2. 2.Which of these is an inclined plane? (a) a wheelchair ramp (b) an axe blade (c) a steering wheel (d) a well winch handle
3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
4. 4.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) newton (N) (d) metre (m)
5. 5.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a window blind cord (c) a wood screw (d) a well-bucket rope wheel
6. 6.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
9. 9.True or false: a fixed pulley rises with the load. (a) True (b) False
10. 10.Which of these is a pulley? (a) a flagpole rope wheel (b) a screw jack (c) a wheelchair ramp (d) a nut and bolt
11. 11.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
12. 12.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
13. 13.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
14. 14.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
15. 15.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) a rolling ball slows (c) shoes grip the floor (d) squeezing a lemon
16. 16.True or false: a nut and bolt is a screw. (a) False (b) True
17. 17.True or false: a movable pulley stays in one place. (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 540 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
20. 20.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
21. 21.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
22. 22.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
23. 23.True or false: powder on a carrom board gives less friction. (a) False (b) True
24. 24.⚖️ A lever bar balances. The load is 180 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.True or false: a fixed pulley needs effort = load. (a) False (b) True
26. 26.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
27. 27.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
28. 28.🏋️ A force of 470 N did 3290 J of work. How many metres did the object move?
29. 29.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
32. 32.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
33. 33.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) gravity (d) magnetic force
34. 34.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) magnetic force (c) muscular force (d) friction
35. 35.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
36. 36.True or false: chalk on a gym bar gives less friction. (a) False (b) True
37. 37.💪 A cart is pulled to the right with 90 N and to the left with 90 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
38. 38.Which of these is a screw? (a) a truck loading ramp (b) a steering wheel (c) a wood screw (d) a crane hook block
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 50 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
40. 40.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)

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