Motion Flashcards
Explain the difference between vector and scalar quantities
a scalar quantity only has a magnitude and a vector quantity has a magnitude and direction
what is acceleration? what is it the rate of? and what type of quantity is it?
-amount that velocity changes per unit time.
-the rate of change of velocity.
-vector quantity
what is the acceleration in freefall due to the Earth’s gravity?
10m/s^2
-what does a horizontal line on a velocity-time graph show?
-shows that the object is at constant velocity
what is the gradient of a line equal to on a velocity-time graph?
-equal to the acceleration of the object.
if a line on a velocity-time graph is on the x axis, what does this indicate?
-that the object is stationary
what is the difference between constant velocity and constant acceleration?
-constant velocity is when an object’s velocity is the same
-constant acceleration is when an object’s velocity is constantly increasing
what is displacement? and what type of quantity is it?
-the change in position of an object
-vector
how can the distance travelled be calculated?
-from the area under a velocity-time graph.
word and symbol equation for formula that links velocity, acceleration and distance
final velocity^2(m/s) - initial velocity^2(m/s) = 2 x acceleration(m/s^2) x distance (m)
v^2-u^2 = 2 x a x X
what happens when an object moves in circle at constant speed?
its direction constantly changes
what does a change in direction cause? and why?
-a change in direction causes a change in velocity
-because velocity is a vector quantity – it has an associated direction as well as a magnitude.
what does a change in velocity result in?
additional: give an example.
-a change in velocity results in acceleration
-an object moving in a circle is accelerating even though its speed may be constant.
under what circumstances will an object accelerate?
if a resultant force acts on it
in the circle circumstance, what is the resultant force and what does it do?
-centripetal force that acts towards the middle of the circle.
-makes the object gravitated towards the centre (of the circle)
