Velocity & Acceleration

Velocity & Acceleration
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PhysicsSecondary Education

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Velocity & Acceleration

Slide 1 - Tekstslide

No, they are not the same thing...
  • Many people confuse the two.
  • Velocity is simply the speed of an object in a particular direction.
  • Acceleration is the rate of the change in velocity, which means something is either slowing down or speeding up. 

Slide 2 - Tekstslide

Slide 3 - Tekstslide

What is Velocity?
  • Vector quantity
  • Speed at which something moves in a particular direction.
  • Measures displacement

Slide 4 - Tekstslide

Velocity Formula
                                                                                        
                                                                     v = velocity
                                                                    d = distance
                                                                     t = time 
v=td

Slide 5 - Tekstslide

What is the S.I. Unit for Velocity?




Because: 
Unit for distance is m (meters)
Unit for time is s (seconds)
sm

Slide 6 - Tekstslide

Let's Practice!
A car travels at uniform velocity a distance of 100 m in 4 seconds. What is the velocity of the car?

First step:
Write the equation for velocity
v=d
      t

Slide 7 - Tekstslide

Next, define your variables:
d = 100m
t = 4s

Now you can plug your variables into your equation:
v = 100
       4

Slide 8 - Tekstslide

Work out the problem
v = 100
     4

v = 25 
sm

Slide 9 - Tekstslide

What is Acceleration?
  • Vector quantity
  •  The rate at which an object changes its velocity over a period of time.


REMEMBER:
Vector quantity of the rate and direction of motion. In simpler terms, it is the speed at which something moves in one direction.

Slide 10 - Tekstslide

Acceleration Formula
a = acceleration

    v = change in velocity (vf {final} - vi {initial})

    t = change in time 
(tf {final} - ti {initial})




Slide 11 - Tekstslide

What is the S.I. Unit for Acceleration?
       


(meters per second squared)
Because:
 Unit for velocity is        
Unit for time is seconds


sm
sm
2

Slide 12 - Tekstslide

Keep in mind
  • Subtract initial velocity from final velocity. If you do it in reverse, your acceleration will be incorrect.
  • If the final velocity is less than the initial velocity, you will have a negative number which means the object slowed down.
  • If you do not have a starting time, use zero (0). 

Slide 13 - Tekstslide

Let's Practice
A delivery truck accelerates from 20       to 40        in 4 seconds. What is its average acceleration?

First, write out your equation

a = v (f) - v (i)
       t (f) - t (i)


sm
sm

Slide 14 - Tekstslide

Next, define your variables
v (f) = 40 
v (i) = 20
t (f) = 4s
t (i) = 0s




sm
sm

Slide 15 - Tekstslide

Plug your variables into the equation

                                                       a =  40 - 20
                                                                 4 - 0   
                                                          a = 20
                                                                  4
                                                          a = 5


  

sm
2

Slide 16 - Tekstslide

CONGRATULATIONS

You have successfully learned about velocity & acceleration.

Slide 17 - Tekstslide