Chapter 2 Flashcards
(20 cards)
What is the definition of distance?
The actual length of the path travelled by an object between 2 points.
SI unit: m
What is displacement?
The shortest distance between 2 points, measured in a specified direction.
SI unit: m
Define speed.
Distance travelled per unit time by an object.
SI unit: m/s or ms-1
What is acceleration?
Rate of change of speed (or) velocity.
SI unit: m/s²
What is instantaneous speed?
Speed of an object at a particular instant in time.
What is average speed?
Total distance travelled divided by the total time of the travel.
How is velocity defined?
The displacement of an object divided by the time taken.
What does a Distance Time Graph indicate when the graph curves up?
The gradient consistently increases, showing acceleration.
What does a downward curve in a Distance Time Graph indicate?
The gradient consistently decreases, showing deceleration and that the object is moving back to it’s start.
What formula is used to calculate acceleration?
a = (v - u) / (t2 - t1)
In the formula for acceleration, what does ‘v’ represent?
Final velocity (or) speed.
In the acceleration formula, what does ‘u’ stand for?
Initial velocity (or) speed.
What does ∆v refer to in acceleration calculations?
The calculation v - u.
What does ∆t refer to in acceleration calculations?
The calculation t2 - t1.
What does a positive gradient indicate in a Speed Time Graph?
Acceleration.
What does a 0 gradient indicate in a Speed Time Graph indicate?
Constant speed.
What does a negative gradient indicate in a Speed Time Graph?
Deceleration.
What does a line touching the x-axis represent in a Speed Time Graph?
The object is at rest.
In a Speed Time Graph, what does an upward curve with decreasing gradient indicate?
Acceleration decreases but speed increases.
In a Speed Time Graph, what does downward curve indicate?
Deceleration and speed decreases.
