Unit 1 - Kinematics Flashcards
To find the magnitude of R. Use which equation to solve?
Pythagorean Theorem
Rt/\2 = Rx/\2 + Ry/\2
A2 + B2 = C2
What are components
Perpendicular parts into which a vector can be separated (X and Y)
After finding the magnitude of Rt, you may find the angle of Rt using which equations?
Trigonomic Equation.
Sine / Cosine / Tangent
SOH CAH TOA
What are the two ways to express the resultant vector’s magnitude?
The Polar Coordinates Method
The Navigator Method
What is Relative Motion?
Motion measured with respect to an observer
What is ground velocity?
Velocity relative to an observer on the ground
What is air velocity?
An objects velocity relative to still air
What is wind velocity?
Velocity of the wind relative to the ground
What is Trajectory?
The parabolic motion of a projectile
What is Range?
The distance a projectile travels horizontally over level ground
Collinear vectors lie along which line?
The same straight line
Non-collinear vectors are along which line?
Not along the same straight line
What is a Scalar quantity?
Scalar quantities consist of a number and a unit.
What is a vector quantity?
A vector quantity consists of a number, a unit and a direction
What is Distance?
The length of a path taken to travel from one position to another
What is position?
The straight line distance from the orgin to the object’s location
What is displacement?
The change in position
What does a position time graph look like for an object at rest
A straight line with zero slope
What does a position time graph look like for an object moving at a constant velocity?
A straight line with a non zero slope
The greater the slope of a position time graph..
The faster the object is moving
What does the slope of a velocity time graph represent?
Acceleration
What does a velocity time graph look like for an object experiencing uniform motion?
A horizontal line.
What does a position time graph look like for an object undergoing uniformly accelerated motion?
A curve
What does a velocity time graph look like for an object undergoing uniformly accelerated motion?
A straight line with a non zero slope.
What does an acceleration time graph look like for an object undergoing uniformly accelerated motion?
A horizontal line
What does the slope of the tangent give you on a position time curve?
Instantaneous velocity
What does the area under a velocity time graph represent?
Displacement
What is a representation of the average velocity on a position time graph?
Total displacement divided by time elapsed
When solving kinematics equations, how do you choose the correct equation?
Choose the equation that contains all the given variables in the problem as well as the unknown variable.
At maximum height, what is a projectiles verticals velocity?
Zero
The time taken for an object to reach maximum height is equal to what?
Equals the time taken to fall back down to the original height.
How do we add vectors in two dimensions?
Draw a scale diagram. Or resolve them into their components and use trigonometry to to find the resultant.
How do we solve relative motion problems?
Use trigonometry, with ground velocity as the resultant. If the vectors are not perpendicular, resolve them into their components first.
What is the shape of a projectiles trajectory?
A parabola
How do we solve projectile problems in two dimensions?
Resolve them into their horizontal and vertical components. Then use kinematics equations. The time taken to travel horizontally equals the time taken to travel vertically.
