Velocity
What is the equation for velocity?
v=d/t
What are the two equations for accelration?
a=(delta v)/(t)
a=(vf-vi)/(t)
What does a straight horizontal line mean on a velocity vs time graph?
The object is moving at a constant velocity.
How many different forces are acting on an object in projectile motion?
(Hint: How many vectors do we draw?)
2
What are the units of velocity?
m/s
What are the units for acceleration?
m/s^2
Gravity is a form of _____________.
(Hint: This is interchangeable with gravity in many of our equations)
(Hint: Look at units)
Acceleration
What does the slope of a velocity vs time graph represent?
Acceleration (m/s^2)
In what direction do our forces act on a projectile?
Vertical and Horizontal
A sound wave travels 1029m in 3 seconds. What is the velocity?
343m/s
A train starts at rest and accelerates for 5 seconds. It's final velocity is 3m/s. What is the acceleration?
0.6 m/s^2
What is the equation I would use to find the velocity of an object in free fall?
Vf = vo +2ad
How do you find the displacement on a velocity vs time graph?
Find the area under the curve. All of the areas above the x-axis added up and subtract any areas under the x-axis.
Pythagoreans Theorem
A plane flies 235 km in 17 minutes. What is the velocity in m/s?
230.39 m/s
A car starts at rest and accelerates at 3m/s^2 for 12 seconds. What is the final velocity?
36 m/s^2
100.1 m
What does it mean when the graph crosses over the x-axis on a velocity vs time graph?
The object changes direction. The object slows to a stop, then begins to accelerate in the opposite direction.
What are the equations we use to find the X and Y velocities of a projectile?
Vx = vcos(##)
Vy = vsin(##)
A car drives 90 km in 2 hours and 35 minutes. What is the velocity in m/s?
9.68 m/s
A driver steps on the breaks for 3.23 seconds and the car comes to a complete stop. The acceleration of the car is -10.37m/s^2. What is the cars initial velocity?
33.5m/s
What is the distance an object fell if it was released with an initial velocity of .56 m/s and it has fallen for 5 seconds?
125.425 meters
Describe a situation that would create this velocity vs time graph.
An object accelerates in the positive direction, then moves at a constant velocity, then begins to slow down to a stop, then turns and accelerates in the opposite direction, then moves at a constant velocity, then begins to slow down to a stop again.
A potato is shot out of a slingshot with a velocity of 25 m/s at 75 degrees above the horizontal. What are the X and Y components of the potatoes velocity?
X = 6.47 m/s
Y = 24.15 m/s