Velocity
What is the formula for finding Velocity?
V= d/t (distance divided by time)
What is the formula for Acceleration?
a= v/t
If you have a horizontal line in a position vs time graph. What does it mean?
Not moving
If you have a graph of velocity vs time, and the line is horizontal, what does it mean?
Moving at a constant velocity.
What is the symbol that represent change?
Delta
If the object in the problem starts "at rest" what is the initial velocity?
V(intitial)= 0
What does acceleration mean?
Change of speed or direction over time
If you move forward 25 meters. then you stop for 10 seconds, and the move backwards 5 meters. What was your displacement?
20meters
If the magnitude of your velocity does not change, can you still have acceleration?
Yes, if your velocity is constant but you change direction you will have acceleration.
What is the formula for finding distance if you have initial velocity, acceleration and time as your "knowns"?
Dx= v(i)t+1/2at(^2)
If the object in the problem "stops" what is the final velocity?
Velocity(final)=0
What does it mean to have constant acceleration?
Whenan accelerating object will change its velocity by the same amount each second.
If your position does not change, can you have a velocity different than cero?
No, because in order to have velocity you need to move or have any displacement.
Describe the motion of the gray line as shown in the graph (shown separately).
First moving in the positive direction with a decreasing velocity and then moving in the negative direction with an increasing velocity.
What is the formula for finding distance if you are moving at constant speed? (not acceleration)
A car travels 25 m in 5 seconds. What is the velocity of the car?
5 m/s
The final velocity of a car is 20 m/s, its initial velocity was 5m/s. This change happened in 10 s.
What was the acceleration?
1.5 m/s2
If you are moving backwards, how that affect your displacement?
Your displacement will be negative
Can velocity ever be greater than speed? why?
No because velocity uses displacement and it considers direction
A car travels at a constant speed of 25 m/s for 20 seconds. How far does it travel?
500 meters.
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until it finally lifts off the ground. What is it's velocity at take-off? (Show you work).
104 m/s
A plane starts from rest and then takes off at a speed of 100 m/s in 10 seconds. What is the acceleration of the plane? (Show you work).
10 m/s^2
A person moves 3m to the right and then 4m up, forming a triangle. What was his displacement?
5 meters
When time =2 seconds the person was at 10m. Then
when time = 5 seconds the person was at 15m.
Calculate the velocity. (Use delta)
1.66 m/s
A car starts at rest and increases its speed to 25 m/s in 5 seconds. How far does it travel during those 5 seconds?
62.5 meters.