AJM 10 STS REVIW EQUATION OF MOTION

An object could be accelerating if?

1. speed up 2. it slows down 3. It changes direction

What is the acceleratin formula ?Acceleration is the rate of change of velocity

A=v/t

We used an equation to work out acceleration... what was it?

Acceleration = change in velocity _________________________ Change in time

What is vi? Vi's unit is m/s

Initial velocity

What does vi stand for and what does that mean?

Initial velocity and it means the velocity at the beginning.

What is acceleration?

Is the rate of change of velocity

What is accleration?

It's change of speed and direction.

A bus that is traveling at 20.0 m/s speeds up at a constant rate of 3 m/s2. What velocity does it reach 5 s later? Vf=vi+at

Vf=20+(3)(5) =20+15 =35m/s

If the initial velocity = 5m/s and acceleration = 2m/s2 and time = 3s ... what is the final velocity?

Vf=5+(2x3)=11m/s2

A ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hole is positive. If the ball starts with a speed of 4.0 m/s and slows at a constant rate 1.0 m/s2, what is its velocity after 2.0 s? Vf=Vi+at

Vf=Vi+at =4+(-1)(2) =4-2 =2m/s

Find the acceleration for a car travelling at 3m/s that speeds up to 18m/s in 3s ?

a = vf-vi ________ T =18-3. 15 _____ = ____= 5 m/s^2 3. 3

Find the acceleration for a girl who was running at 10m/s and slows down to a stop in 2s?

a=V/t =10/2 = 5 m/s^2

What is the equation for acceleration?

a=vf-vi/t

What is the unit for the acceleration?

m/s2

Rearrange the formula a=(vf-vi)÷t. To find the final velocity.

vf=vi-at