1.3 scalar & vector quantities

10,387 views

Published on

1 Comment
10 Likes
Statistics
Notes
  • good work there, so i can not download
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total views
10,387
On SlideShare
0
From Embeds
0
Number of Embeds
98
Actions
Shares
0
Downloads
448
Comments
1
Likes
10
Embeds 0
No embeds

No notes for slide

1.3 scalar & vector quantities

  1. 1. 1.3Understanding Scalar & Vector Quantities www.myfunphysicsworld.blogspot.com
  2. 2. Chapter 1 Introduction To Physics 1.3Understanding Scalar & Vector Quantities www.myfunphysicsworld.blogspot.com
  3. 3. Learning OutcomesDefine scalar and vectorquantitiesGive examples of scalar andvector quantities www.myfunphysicsworld.blogspot.com
  4. 4. Physical Quantities Scalar vector Magnitude Magnitude no direction directionLength, mass, time Displacement,electric current, velocity, force,temperature, area, Acceleration,distance, speed, Momentum, weight,energy,density,power impulse, pressure www.myfunphysicsworld.blogspot.com
  5. 5. Conduct simple activity (pg 10) O C 16 m 8m A B 14 m Physics Lab PlanIdea : distance & displacement ; speed & velocity www.myfunphysicsworld.blogspot.com
  6. 6. Distance = total length of thepath travelledDisplacement = distancetravelled from its initial positionto its final position www.myfunphysicsworld.blogspot.com
  7. 7. Total Displacement, time, speed/ velocity/ distanc d/m t/s m s-1 m s-1 e, s/m A 8 8 from O to A 2.40 3.33 3.33 from O to A B 22 16 from O to B 5.28 4.17 3.03 C 30 14 from O to 7.65 3.92 1.83 C O 44 0 from O to O 10.32 4.26 0.00Displacement = distance travelled from its initial position to its final position www.myfunphysicsworld.blogspot.com
  8. 8. Total Displacement, time, speed/ velocity/ distanc d/m t/s m s-1 m s-1 e, s/m A 8 ___ from O to 7.51 1.07 1.07 A from O to A B 22 ___ from O to 15.51 1.42 1.03 B C 30 ___ from O to 22.05 1.36 0.63 C O 44 ___ from O to 25.50 1.73 0.00 ODisplacement = distance travelled from its initial position to its final position www.myfunphysicsworld.blogspot.com
  9. 9. Total Displacement time, speed/ velocity/ distance , d/m t/s m s-1 m s-1 , s/mA 9.0 9 from O to 3.13 2.87 2.87 A from O to AB 15.5 11.1 from O 5.34 2.90 2.08 to B from O to BC 24.5 6.5 from O to 8.24 2.97 0.79 C from O to CO 31.0 0 from O to O 10.67 2.90 0.00 from O www.myfunphysicsworld.blogspot.com to O
  10. 10. Scalar VectorQuantities Quantitiese.g: distance, Displacementspeed , velocityHas Hasmagnitude but magnitudeno direction and direction www.myfunphysicsworld.blogspot.com
  11. 11. Addition Scalar &Vector Quantities www.myfunphysicsworld.blogspot.com
  12. 12. Adding Scalar QuantityCan be added, subtracted, multiplied anddivided like ordinary numbers.e.g:(a) 3 kg of sand is added to 1 kg cement, resulting mixture has a mass of 4 kg(b) 5 liters of water are poured from a pail that has 8 liters of water in it. The resulting volume is 3 liters www.myfunphysicsworld.blogspot.com
  13. 13. Scalar Quantities 5 kg 10 kgTotal mass = 5 + 10 = 15 kg www.myfunphysicsworld.blogspot.com
  14. 14. Adding Vector QuantityAn arrow is used to represent the magnitudeand direction of a vector quantity. Same direction = sum Opposite direction = minus www.myfunphysicsworld.blogspot.com
  15. 15. eg. 1 50 N 30 NTotal Force* = 50 + 30 = 80 N (80 N due west//to the left)*=resultant force//net force www.myfunphysicsworld.blogspot.com
  16. 16. eg. 2 50 N 10 NTotal Force = 50 - 10 = 40 N (40 N due west//to the left) www.myfunphysicsworld.blogspot.com
  17. 17. eg. 350 N 50 NTotal Force = 50 - 50 = 0N(object is not moving//at rest//stationary) www.myfunphysicsworld.blogspot.com
  18. 18. How much is the resultant force? www.myfunphysicsworld.blogspot.com
  19. 19. www.myfunphysicsworld.blogspot.com
  20. 20. Adding Vector Quantity An arrow is used to represent the magnitude and direction of a vector quantity. e.g : velocity of airplane = 100 km/h wind velocity = 20 km/h(a) If same direction, Resulting velocity of airplane= 100 + 20 = 120 km/h(a) If opposite direction, resulting velocity of airplane = 100 -20 = 80 km/h www.myfunphysicsworld.blogspot.com
  21. 21. Special Case:Non-parallel vectors www.myfunphysicsworld.blogspot.com
  22. 22. Case 1Two vectors acting at a point can be replacedby a single vector with the same effect. www.myfunphysicsworld.blogspot.com
  23. 23. Case 2 Resultant VectorTwo vectors acting at a point can be replacedby a single vector with the same effect. www.myfunphysicsworld.blogspot.com
  24. 24. www.myfunphysicsworld.blogspot.com
  25. 25. www.myfunphysicsworld.blogspot.com
  26. 26. Homework  www.myfunphysicsworld.blogspot.com
  27. 27. 1. Jeremy walked 3 m due east, and then 4 m due north. (a) What is his total distance? 3m+4m=7m (b) What is his displacement? 5m 5m 4m 3m www.myfunphysicsworld.blogspot.com
  28. 28. 2. Every morning Amirul walks to Badrul’s house which is situated 80m to the east of Amirul’s house. They then walks towards their school which is 60m to the south of Badrul’s house. What is the distance traveled by Amirul and his displacement from his house? www.myfunphysicsworld.blogspot.com

×