Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 78 · 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.True or false: a movable pulley stays in one place. (a) False (b) True
2. 2.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
4. 4.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
5. 5.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) use a smaller force (d) make new energy
6. 6.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
7. 7.🏋️ A force of 440 N pushes a cart 4 m along the floor. How much work is done, in joules?
8. 8.True or false: a movable pulley is on a flagpole top. (a) True (b) False
9. 9.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wheel on ball bearings (d) a wet tiled floor
11. 11.Which of these is caused by friction? (a) a magnet picks up pins (b) a thrown ball comes down (c) rubbing hands warms them (d) a fridge magnet sticks
12. 12.💪 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
13. 13.True or false: powder on a carrom board gives more friction. (a) False (b) True
14. 14.🏋️ A force of 160 N did 1600 J of work. How many metres did the object move?
15. 15.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
16. 16.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a flagpole rope wheel (c) a water tap handle (d) a window blind cord
17. 17.Which of these is caused by gravity? (a) a river flows downhill (b) brakes stop a bicycle (c) shoes grip the floor (d) a fridge magnet sticks
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
19. 19.Which of these is an inclined plane? (a) a playground slide (b) the tip of a nail (c) a bottle cap (d) a flagpole rope wheel
20. 20.Which of these is a lever? (a) a claw hammer on a nail (b) a chisel (c) a truck loading ramp (d) a crane hook block
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
22. 22.💪 Two children push a box to the right, one with 85 N and the other with 70 N. What is the net (total) force on the box, in newtons?
23. 23.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
24. 24.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
25. 25.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a road up a hill (c) a truck loading ramp (d) an axe blade
26. 26.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
28. 28.💪 A cart is pulled to the right with 20 N and to the left with 30 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
29. 29.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a box pushed on carpet
31. 31.True or false: powder on a carrom board gives less friction. (a) False (b) True
32. 32.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
34. 34.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 380 N bucket on the axle, in newtons? (ideal)
38. 38.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
39. 39.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3

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