Vectors
Which one of these are NOT vectors? (Two Choices)
A) Velocity
B) Displacement
C) Time
D)Acceleration
E) Distance
Distance and Time
How do you solve for Average velocity?
Delta X/ Delta t
What is vy at the maximum height of a projectile object?
0 m/s
What is the unit marker for the x vector and the y vector?
I hat and J hat.
When can you use the 3 kinematic equations for solving acceleration?
When you are just solving for the constant accelerations.
What is the acceleration in the y-axis and in the x-axis?
X: 0 m/s2
Y: 9.8 m/s2
How do you use mathematical applications for vectors? (+,-,x,/)
Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion?
A) A graph of its velocity as a function of time is a horizontal line.
B) In equal times its speed changes by equal amounts.
C) In equal times it moves equal distances.
D) A graph of its position as a function of time has a constant slope.
E) In equal times its velocity changes by equal amounts.
Documentation: Mastering Physics
E) In equal times its velocity changes by equal amounts.
How do you find the maximum height using the time it takes for the projectile to be launch and land on level ground and the initial velocity?
Cut the time in half and use Delta X = v0t+ 1/2at2
What are the x and y vectors?
X = 1.69
Y = 3.63
A model rocket is launched straight upward. Its altitude y as a function of time is given by y=bt−ct2, where b = 75 m/s , c = 4.9 m/s2, t is the time in seconds, and y is in meters.
Use differentiation to find a general expression for the rocket's velocity as a function of time.
When is the velocity zero?
Documentation: Mastering Physics
v(t)= b−2ct
t v=0 = 7.7 s
What variable can you use to connect the two axis (X and Y)?
Time
For the vectors shown in the figure, express vector S⃗ in terms of vectors M⃗ and N⃗. (Reference Cheat Sheet)
Documentation: Mastering Physics
S⃗ = M⃗ − N⃗
A rocket rises with constant acceleration a = 48 m/s2.
When its speed has reached 3.1 km/s , what's its height?
How long did it take to reach that height?
Documentation: Mastering Physics
h = 100 km
t = 65 s
A kid fires a squirt gun horizontally from 1.6 m above the ground. It hits another kid 2.5 m away square in the back, 0.98 m above the ground.
What was the water's initial speed?
Documentation: Mastering Physcis
v = 7.0 m/s