Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 785 · 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.Which of these is a lever? (a) a claw hammer on a nail (b) a playground slide (c) a jar lid (d) a flagpole rope wheel
2. 2.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
3. 3.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
6. 6.Which of these is a lever? (a) a crowbar (b) an axe blade (c) a wheelchair ramp (d) a well-bucket rope wheel
7. 7.Which of these is caused by magnetic force? (a) a rolling ball slows (b) shoes grip the floor (c) a magnet picks up pins (d) an apple falls down
8. 8.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
9. 9.⚖️ A seesaw balances. Ravi (640 N) sits 1 m from the pivot on one side; Arjun (160 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
10. 10.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
11. 11.🔍 Which is the odd one out? (a) a playground slide (b) a truck loading ramp (c) a road up a hill (d) a flagpole rope wheel
12. 12.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
15. 15.True or false: a nutcracker is an inclined plane. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a smooth steel slide (d) chalk on a gym bar
17. 17.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a round doorknob (c) a well winch handle (d) a water tap handle
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
19. 19.Which of these is a screw? (a) a claw hammer on a nail (b) a bottle cap (c) a playground slide (d) a wheelchair ramp
20. 20.🏋️ Pushing a crate 6 m took 180 J of work. What force was used, in newtons?
21. 21.Which of these is caused by muscular force? (a) a thrown ball comes down (b) a river flows downhill (c) an apple falls down (d) squeezing a lemon
22. 22.🏋️ Pushing a crate 1 m took 350 J of work. What force was used, in newtons?
23. 23.🏋️ A force of 350 N pushes a cart 3 m along the floor. How much work is done, in joules?
24. 24.True or false: closing a drawer is a push. (a) False (b) True
25. 25.💪 A bag has a mass of 23 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
26. 26.Which of these is caused by muscular force? (a) lifting a school bag (b) a thrown ball comes down (c) a fridge magnet sticks (d) a compass needle turns
27. 27.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
30. 30.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) muscular force (c) friction (d) gravity
31. 31.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
32. 32.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
33. 33.True or false: a seesaw is a wedge. (a) False (b) True
34. 34.🏋️ A force of 490 N pushes a cart 2 m along the floor. How much work is done, in joules?
35. 35.Which of these is caused by friction? (a) a thrown ball comes down (b) brakes stop a bicycle (c) a river flows downhill (d) a magnet picks up pins
36. 36.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) metre (m) (d) newton (N)
37. 37.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
38. 38.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.True or false: a movable pulley rises with the load. (a) True (b) False
40. 40.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False

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