Kinematics Flashcards
What is displacement?
It is the straight-line distance and direction from a fixed point.
What is the difference between speed and velocity?
Speed is the distance travelled per unit time while velocity is the rate of change of displacement.
How are speed and velocity related?
Speed is the magnitude of velocity.
What is acceleration?
It is the rate of change of velocity.
How to determine displacement from velocity-time graph?
Area under the graph in a time interval.
How to determine velocity from displacement time graph?
δs/δt
What are the 2 formulas for kinematics? What are the assumptions?
s=ut + 0.5at^2
v^2 = u^2 + 2as
Constant acceleration, motion is in straight line.
In free fall of an object, what causes acceleration? State the reason this acceleration is uniform.
Gravitational acceleration of the uniform gravitational field.
It is uniform as there’s no air resistance.
Why is the displacement time graph a curve for an object under free fall?
Gradient is increasing in magnitude as the velocity increases uniformly.
What is air resistance?
It is the resistive force acting opposite to the motion on a body moving through air.
What factors affect air resistance?
- speed
- cross section area
- density of medium
For a body projected upwards, why is the change in velocity greater?
Air resistance and weight.
Air resistance is 0 at maximum height of projection because _____.
Speed is 0.
At the maximum height, the gradient of a velocity time graph is equivalent to.
Acceleration due to gravitational field.
