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Physics
1. Forces and Motion
Movement and Position
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Created by
Elena Adali
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Cards (14)
What is the equation for average speed?
Average speed =
distance travelled
/
time taken
Define velocity
Speed
in a given
direction
A
vector
quantity
How do you find the velocity on a distance-time graph?
Calculate the
gradient
How do you read a distance time graph?
Straight line = moving at constant speed away from starting point
Steeper straight line = moving at faster constant speed away from starting point
Downwards curving line = decelerating
Horizontal line = stationary
Upward curving line = accelerating
Straight line towards x axis = constant speed back towards starting point
Y axis represents Distance (m)
X axis represents Time (s)
How is the gradient of a straight line calculated?
Change in
y-axis
Change in
x-axis
Describe how to investigate the average speed of an object
Measure
distance travelled
- e.g. with a
ruler
Use a suitable, sensible
distance
Measure
time taken
- e.g. with a
stopwatch
Start and
stop timing
at a set point
Repeat experiment and calculate
mean time
Speed
=
distance
/
time
How could the accuracy of this be improved?
Investigate the average speed of an object.
Could be improved with
A more
accurate
timing method
e.g. using
light gates
What is the equation for acceleration?
Acceleration =
change
in
velocity
/
time taken
a = (v - u) / t
- a = acceleration
- v = final velocity
- u = initial velocity
- t = time
How do you read a Velocity-time graph?
A)
velocity (m/s)
B)
1. Accelerating
C)
2. Accelerating at faster rate
D)
3. Travelling at constant velocity (no acceleration)
E)
4. Decelerating
F)
Area under graph = distance traveled
G)
Time (s)
7
Describe the motion of the object shown by the velocity - time graph above
From
0-10s
, object
accelerates slowly
From
10-20s
, object
accelerates faster
From
20-40s
, object
travels
at
constant velocity
(Note: It does not stop)
From
40-50s
, object
decelerates
until it
stops
How do you find acceleration on a velocity-time graph?
Calculate
gradient
How do you find the distance travelled in a velocity-time graph?
Calculate
area
under the graph
What is the relationship between
final speed (v), initial speed (u), acceleration (a) and distance (s)
v²
=
u²
+
2as
What is the SUVAT equation?
Equation of
motion.
Use v² =
u²
+
2as