Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 264 · 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 pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) litre (L) (d) newton (N)
3. 3.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
4. 4.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
5. 5.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) wheel and axle (c) lever (d) pulley
6. 6.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the load (d) the effort
7. 7.True or false: a fixed pulley needs effort = load. (a) False (b) True
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.Which of these is caused by gravity? (a) pedalling a cycle (b) brakes stop a bicycle (c) a thrown ball comes down (d) a magnet picks up pins
10. 10.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
11. 11.⚖️ A seesaw balances. Asha (120 N) sits ? m from the pivot on one side; Arjun (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts an 880 N bucket on the axle, in newtons? (ideal)
13. 13.⚙️ Which simple machine is a well winch handle? (a) lever (b) inclined plane (c) wheel and axle (d) wedge
14. 14.True or false: kicking a football is a pull. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on a carpet than on ice?
17. 17.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
19. 19.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
20. 20.True or false: a playground slide is an inclined plane. (a) True (b) False
21. 21.💪 Two children push a box to the right, one with 5 N and the other with 5 N. What is the net (total) force on the box, in newtons?
22. 22.⚙️ Which simple machine is a water tap handle? (a) screw (b) lever (c) inclined plane (d) wheel and axle
23. 23.Which of these is caused by magnetic force? (a) a rolling ball slows (b) an apple falls down (c) rain falls to the ground (d) a fridge magnet sticks
24. 24.True or false: a tug of war is a push. (a) True (b) False
25. 25.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
26. 26.Which of these is caused by muscular force? (a) an apple falls down (b) rubbing hands warms them (c) pedalling a cycle (d) rain falls to the ground
27. 27.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 90 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
29. 29.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.⚖️ A seesaw balances. Ravi (240 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
32. 32.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
33. 33.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
34. 34.True or false: skating on ice gives more friction. (a) True (b) False
35. 35.True or false: plucking a mango is a pull. (a) False (b) True
36. 36.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 120 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
38. 38.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (260 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet

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