Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 876 · 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.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
2. 2.Which of these is caused by friction? (a) a magnet picks up pins (b) squeezing a lemon (c) a thrown ball comes down (d) rubbing hands warms them
3. 3.💪 A bag has a mass of 6 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.True or false: chalk on a gym bar gives less friction. (a) False (b) True
6. 6.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
8. 8.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.⚖️ A lever bar balances. The load is 80 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a kind of wheel (d) a ramp wrapped round
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) sand on a slippery path (d) skating on ice
12. 12.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.True or false: pressing a doorbell is a pull. (a) False (b) True
14. 14.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
15. 15.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (380 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.🔍 Which is the odd one out? (a) a playground slide (b) the tip of a nail (c) a wheelchair ramp (d) a truck loading ramp
17. 17.True or false: a movable pulley needs effort = load. (a) False (b) True
18. 18.💪 A cart is pulled to the right with 20 N and to the left with 10 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
19. 19.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.💪 A bag has a mass of 11 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1120 N bucket on the axle, in newtons? (ideal)
23. 23.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
24. 24.True or false: kicking a football is a pull. (a) True (b) False
25. 25.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) False (b) True
26. 26.True or false: a tug of war is a pull. (a) True (b) False
27. 27.Which of these is caused by friction? (a) an apple falls down (b) rain falls to the ground (c) a magnet picks up pins (d) shoes grip the floor
28. 28.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
30. 30.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 80 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.💪 Two children push a box to the right, one with 85 N and the other with 35 N. What is the net (total) force on the box, in newtons?
34. 34.⚙️ Which simple machine is a door stopper? (a) wheel and axle (b) pulley (c) wedge (d) inclined plane
35. 35.True or false: closing a drawer is a pull. (a) False (b) True
36. 36.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the axle (d) the load
37. 37.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
38. 38.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a wood screw (c) a screw jack (d) a jar lid
39. 39.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
40. 40.💪 A cart is pulled to the right with 35 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

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