Kinematics Flashcards
What is meant by speed?
Distance moved per unit time.
Speed is a scalar quantity.
What is meant by velocity?
Rate of change of displacement per unit time
Velocity is a vector quantity.
How do you calculate average speed?
Average speed = total distance / total time
How do you calculate average velocity?
Average velocity = total displacement / total time
What is the SI unit for speed?
Metre per second (m s-1)
What is the difference between scalar and vector quantities?
Scalar has magnitude only; vector has both magnitude and direction.
What is distance?
Length covered by a moving body
Distance is a scalar quantity.
What is displacement?
The straight-line distance measured from a reference point in a stated direction
Displacement is a vector quantity.
What is the formula for calculating displacement?
Displacement = final position - initial position
What is the significance of sign convention in vector quantities?
It helps indicate direction; positive and negative signs represent opposite directions.
Fill in the blank: The SI unit for distance is _______.
metre (m)
Fill in the blank: Scalar quantities have _______ but no direction.
magnitude
True or False: Velocity is a scalar quantity.
False
True or False: Distance can be negative.
False
What is the definition of acceleration?
The rate of change of velocity per unit time
True or False, acceleration is a vector quantity.
True
What is the SI unit of acceleration?
m s^-2
What are the symbols in kinematic?
Distance: d/m
Displacement: s/m
Speed: v/m s^-1
Velocity: u(initial), v(final)/ m s^-1
Acceleration: a/m s^-2
Time: t/s
What can you infer from displacement-time graph (s-t graph)?
Gradient - velocity
Area under graph - no meaning
What can you infer from a velocity-time graph (v-t graph)?
Gradient - acceleration
Area under graph - change in displacement
What can you infer from an acceleration-time graph (a-t graph)?
Gradient - no meaning
Area under graph - change in velocity
What are the four derived equations for kinematics?
- v=u+at
- v^2=u^2+2as
- s=(u+v)/a t
- s=ut+1/2 at^2
Where…
s: change in displacement
u: initial velocity
v: final velocity
a: acceleration
t: duration of time
What can be inferred in type of graph if gradient is zero?
s-t graph: s is constant
v-t graph: v is constant
a-t graph: a is constant
What can inferred from each type of graph when gradients is increasing/constant/decreasing?
s-t graph: v is increasing/constant/decreasing
v-t graph: a is increasing/constant/decreasing
a-t graph: nil
What can be inferred when gradient of each type of graph is a straight line?
s-t graph: v is uniform
v-t graph: a is uniform
What can be inferred from the gradient of each type of graph if it is a curve?
s-t graph: v is non-uniform
v-t graph: a is non-uniform
