Motion and Kinematics in One Direction Flashcards
Where do objects that are turning accelerate towards?
The center of the turn
What are the types of motion?
- Not moving
- Moving with constant speed
- Moving with constant velocity
- Acceleration
What ways can one describe motion?
- Tell someone through words
- Graph motion
- Write an equation of motion
- Draw a diagram of motion
What does x represent? What is its unit?
X represents change in position and is measured in meters
What are the symbols for the final position of an object?
Xf, X2, or X
What are the symbols for the initial position of an object?
Xi, X1, or X0
What is the equation of displacement?
Xf-xi
What are the symbols for final time?
Tf, t2, t
What are the symbols for initial time?
To, t1, t0
What is the equation for time interval?
Tf-ti
*Time is never negative!
What is the unit of average velocity?
M/s with a DIRECTION
What is the difference between distance as displacement? Speed and velocity?
Magnitude vs. direction and magnitude
What is the equation for average velocity?
(Change in x)/(change in t)
Why can only AVERAGE velocity be determined?
Don’t know if velocity is constant– could slow down then speed up
Define instantaneous velocity.
Velocity at a certain time
What is the unit for time?
Seconds
How do you find instantaneous velocity?
Find the slope of a tangent on a position vs. time graph
Vector vs. scalar
Vector- magnitude and direction
Scalar- magnitude
What is the acceleration due to gravity?
-9.8 m/s^2
What is position?
Where an object is located in space, need reference point and vector
What is speed?
- How fast you are going
- change in distance over change in time
What is velocity?
- Speed and direction of an object
- Change in position over time in a certain direction
What is displacement?
Change in position (size and direction)
What is the equation for displacement?
Change in x= Xf-xi
Is gravity a vector or a scalar?
Vector
What’s another name for force?
A push or pull
Is force a vector or a scalar?
A vector (how great of a force and in which direction one is pushing or pulling)
When is air resistance not applicable?
When there are low amounts of surface area and speed
What is terminal velocity?
A constant velocity that occurs when there is so much air resistance the object doesn’t accelerate anymore
What is true about objects on earth?
Force/mass= 9.8 m/s^2
-9.8 m/s^2
What is the unit of acceleration?
M/s/s or m/s^2
What is the equation for average velocity?
Change in x (position) over change in t (time)
What is the equation for average speed?
Change in d (distance) over change in t (time)
What is the equation for average acceleration?
Change in v (velocity) over change in t (time)
What is acceleration affected by?
Force (ex: gravity)
What are the two effects of positive acceleration?
- Speed up and move up/to the right if moving in the positive direction
- Slow down if moving in the negative direction
What are the two effects of negative acceleration?
- Speed up and move down/to the left if moving in negative direction
- Slow down if moving in the positive direction
What does the slope of a velocity vs. time graph represent?
The average acceleration
What does the slope of a position vs. time graph represent?
The average velocity
