Units of Measurement
Formulas
Concepts
Physics Problems
Misc.
100
What is the standard unit for TIME? (SI units)
seconds (sec, s)
100
What is the equation for VELOCITY?
velocity = displacement / time
100
If a problem says that an object starts from REST, what does that mean?
The initial velocity is equal to 0.
100
What is the velocity of an object with a displacement of -10 m and a total time of 10 seconds?
-10 m / 10 s = -1 m/s
100
What movie did we watch in class?
The Theory of Everything (movie about Stephen Hawking)
200
How many miles are there in 10,000 meters?
1609 meters = 1 mile
10,000 meters / 1609 meters= 6.22 meters
200
What is the equation for SPEED?
speed = distance / time
200
What is the velocity of an object at the TOP of its trajectory?
0 m/s
200
If an object has an acceleration of 15 m/s2 over a total time of 5 seconds, what is the average velocity of the object throughout its motion?
a = v/t
15 = v / 5
15 x 5 = v
75 m/s = v
200
What is the difference between distance and displacement?
distance is the TOTAL amount travelled. the displacement is how far an object is from the point of origin.
300
What are the units for displacement we use in this class?
meters (m)
300
What are the four kinematic equations?
300
If the acceleration of an object is changing, can we use the kinematic equations?
NO
300
Solve for the missing side of the triangle below.
angle 1 = 59 degrees
hypotenuse = 17
sin (59) = x / 17
17 x sin (59) = x
x = 14.57
300
Where does gravity always point? (Regardless of the planet of interest)
gravity always points DOWN towards the center of the planet.
400
If displacement is in miles and the time is in hours, what would the units for velocity AND acceleration be?
velocity - miles / hour
acceleration - miles / hour 2
400
A car is moving with a constant acceleration of 10 m/s2. If it starts from rest and travels for a total of 15 seconds, what EQUATION would I use to solve for the final velocity?
Vf = Vi + at
400
What is the OTHER BRANCH of mechanics aside from kinematics?
Dynamics
400
A tennis ball is thrown straight up with an initial speed of 22.5 m/s. It is caught at the same distance above grown. How high does the ball rise?
x = 26 m
400
List at least five (5) expectations I have for you in this class.
...
500
Convert 50 m/s to miles/hour.
1609 meters = 1 mile
60 seconds = 1 minute
60 minutes = 1 hour
111 mi/hr
500
What variable are each of the individual kinematic equations missing?
1. missing displacement
2. missing final velocity
3. missing time
4. missing acceleration
500
Explain why the units for acceleration are
displacement / time 2.
The units for acceleration are displacement / time2 because acceleration = velocity / time. Velocity has units of displacement / time. Therefore, acceleration is displacement / time / time which is
displacement / time2.
500
A construction worker accidently drops a brick from a high scaffold. What is the velocity of the brick after 4 seconds?
v = 39 m/s downwards
500
Describe the first lab we did in detail. What were we solving for? What did we do in Part A? Part B?
We measured the length of the table and for part A, found the amount of time it took the Car to span the length of the table. We then divided the length by the time to solve for the average velocity of the car.
For part B, we measured the distance between points on the table, and measured the time to get from point to point. We then found the velocity for each portion and averaged these.
We made a graph of position vs. time to also use the slope to find velocity.