Kinematics Flashcards
What is the formula for acceleration
a = (v-u)/t
where a is acceleration, v is final velocity, u is initial velocity, t is time taken
For linear displacement-time graphs, how to describe speed/velocity of object
Object moves with uniform speed/velocity of (gradient) m/s
For linear velocity-time graphs, how to describe speed/velocity of object
Velocity increases/decreases at a uniform rate of (gradient m/^s)
For linear velocity-time graphs, how to describe acceleration of object
Uniform acceleration/deceleration of (magnitude of gradient)m/s^2
How to determine change in direction through displacement-time graphs
Change in sign of gradient = change in direction
What happens to direction of movement of object when there is change in sign of gradient in linear velocity-time graph
Object does not change direction but velocity decreases at uniform rate from (point of change in sign) onwards. Object only changes direction when graph crosses time axis
How to find distance travelled using velocity time graph
Find area under velocity time graph to get displacement
What are the conditions for an object to be in free fall
An object is said to be in free fall if only force acting on it is its weight and can only be in free fall if there is no air resistance
(T/F) Does an object free falling near Earth’s surface experience uniform acceleration
True, acceleration due to gravity is about 10m/s^2
Which falls faster, a coin or feather on the moon and do they travel faster or slower compared to on the earth
They fall together, taking a longer time to fall than the coin takes on the earth
When a ball is thrown upwards, what is the direction of acceleration
Downwards
Describe motion of a free falling stone
The stone is falling downwards at a constant acceleration of 10m/s2 (assuming free fall with earth’s gravity)
