4.5.6.1.5 Acceleration Flashcards
Acceleration:
the rate of change of velocity
Acceleration formula:
- acceleration (m/s2) = change in velocity (m/s) / time taken (s)
- a = v (final velocity) - u (initial velocity) / t
constant force applied =
constant force applied = constant rate of acceleration/deacceleration
How can the acceleration of an object be calculated from a velocity - time graph?
the acceleration of an object can be calculated from the gradient of a velocity - time graph
How can the distance travelled be calculated using a velocity-time graph?
the distance travelled by an object (or displacement of an object) can be calculated by finding the area under the graph (measure when appropriate the area under a graph by counting the squares)
How do you find the acceleration of a particular point on a curved velocity-time graph?
on a curved velocity-time graph to fund the gradient to find the acceleration you have to draw a tangent to the point on the curve at which you want to determine the acceleration
If something accelerates, and it is dropping something at an equal rate, what happens to the distance between those things?
as something accelerates, if it is dropping something at an equal rate the distance between those things will become larger despite the rate of things being dropped the same as it is accelerating
How can an object move at a constant speed but also accelerate at the same time?
It’s speed is constant however it can be changing direction meaning it’s velocity is constantly changing and as acceleration is the rate of change of velocity the object will be accelerating
What is the acceleration like in uniform acceleration?
in uniform motion the acceleration is constant
Equation for uniform acceleration:
When can the equations of uniform acceleration only be used?
when an object travels with a constant uniform acceleration in a straight line
What does any object near the Earth’s surface falling under gravity (no air resistance) have an acceleration of?
- 9.8m/s2
- when a ball is thrown upwards it decelerates so with an acceleration of -9.8m/s2 and then when it falls back down again it accelerates at a rate of 9.8m/s2
What is an object that slows down doing?
decelerating
What does drag/air resistance increase with?
Drag/air resistance increases with velocity
What does it mean if the forces on an object are balanced?
- if the forces on an object are balanced, there is no resultant force
- the object either stays still or carries on at a constant velocity