P7: On the Move Flashcards
Projectile Motion, Free Fall, Motion Graphs and equations, Motion in a straight line, Constant velocity
What is a suvat equation which only applies vertically?
s = 1/2gt^2
Formula for instantaneous velocity…
(at a given point in time)
its total displacement
/
its total time
Formula for instantaneous acceleration…
(at a given point in time)
its total velocity to the point
/
time taken to get there
What does the gradient of a displacement-time graph tell us?
(for straight and curved graphs)
The velocity (at that point)
For a curve, draw a tangent at that point and use its gradient
What does the gradient of a velocity-time graph tell us?
The acceleration
What does the area under a velocity-time graph tell us?
This can be found using geometry, or just by counting squares.
The object’s displacement
What does the height of an acceleration-time graph tell us?
The object’s acceleration at that point.
If this is negative, it is decelerating!
The area under an acceleration-time signifies…?
The object’s change in velocity
If total area = 0, it’s moving at a constant velocity.
What ICT can be used to draw distance-time/velocity-time graphs?
An ultrasound position detector
This is a type of data-logger which automatically records an object’s distance from a sensor every few seconds.
Attatch to a computer to get a real-time graph being drawn.
What does Free Fall mean?
The motion of an object downwards, undergoing acceleration of g.
True or False: All objects in Free Fall accelerate at the same rate.
True
What is a when an object is moving downwards?
a can be replaced with g=9.81.ms^-2
Since g is always downwards, its often written as -9.81ms^-2
True or False: Horizontal motion is constant.
True! Since it’s not affected by forces, a=0 (horizontally)
yes, there are probably a few exceptions.
