Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 790 · 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 crowbar is a wedge. (a) True (b) False
2. 2.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
3. 3.🛞 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 carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
5. 5.True or false: closing a drawer is a push. (a) False (b) True
6. 6.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
7. 7.True or false: chalk on a gym bar gives more friction. (a) True (b) False
8. 8.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
9. 9.True or false: pushing a trolley is a pull. (a) True (b) False
10. 10.⚖️ A seesaw balances. Asha (100 N) sits 2 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.Which of these is a pulley? (a) a playground slide (b) a nutcracker (c) a wheelchair ramp (d) a well-bucket rope wheel
13. 13.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a claw hammer on a nail (c) a bottle opener (d) a crowbar
14. 14.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
15. 15.Which of these is a wheel and axle? (a) a truck loading ramp (b) a water tap handle (c) a crowbar (d) a flagpole rope wheel
16. 16.True or false: a movable pulley only changes direction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the fulcrum (d) the load
19. 19.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
20. 20.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
21. 21.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
22. 22.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
23. 23.Which of these is caused by muscular force? (a) rain falls to the ground (b) a magnet picks up pins (c) rubbing hands warms them (d) squeezing a lemon
24. 24.💪 A box weighs 310 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
26. 26.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
27. 27.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
28. 28.⚙️ Which simple machine is a screw jack? (a) lever (b) pulley (c) inclined plane (d) screw
29. 29.True or false: a fixed pulley only changes direction. (a) False (b) True
30. 30.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) gravity (d) muscular force
31. 31.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
32. 32.💪 A bag has a mass of 12 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🏋️ A force of 410 N did 820 J of work. How many metres did the object move?
34. 34.🏋️ A force of 270 N did 1080 J of work. How many metres did the object move?
35. 35.🔍 Which is the odd one out? (a) a round doorknob (b) a flagpole rope wheel (c) a water tap handle (d) a well winch handle
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 100 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
39. 39.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice

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