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Physics
Physics Unit 1
Motion
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Cards (27)
What is the definition of distance between two points?
How
far
they
are
apart
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How does displacement differ from distance?
Displacement specifies
direction
as well
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What is speed defined as?
The rate at which
distance
changes
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What is the difference between speed and velocity?
Velocity is
displacement
change rate
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What is the formula for average speed?
Average speed =
total distance
/
total time
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What is the formula for average velocity?
Average velocity =
total displacement
/
total time
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What is Jo's final displacement after walking around the pitch?
200 m
to the right
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What does the rate of change of speed measure?
Final speed
minus
initial speed
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What is the unit for rate of change of speed?
m/s²
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What does a constant rate of change of speed imply?
Average speed
can be calculated
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What is the formula for average speed when acceleration is constant?
Average speed = (
initial speed
+ final speed) / 2
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What happens to average velocity if starting and finishing positions are the same?
Total
displacement
will be zero
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What is acceleration defined as?
Rate of change of
velocity
with
time
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What does a positive acceleration indicate?
Velocity
is increasing
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What does a negative acceleration indicate?
Velocity
is decreasing or
retardation
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What is the method for investigating average speed on a ramp?
Set up a ramp with
height
measured.
Draw pencil lines
1.0m
apart on the ramp.
Allow a trolley to roll down and time its motion.
Record results for different heights.
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What is a scalar quantity?
A quantity with
magnitude
but no direction
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What is a vector quantity?
A quantity with both
magnitude
and
direction
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Why is the sum of masses always additive but forces are not?
Masses are
scalar
, forces are
vector quantities
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What do you need to interpret distance-time and velocity-time graphs?
Gradient of distance-time graph =
speed
Gradient of speed-time graph = rate of change of speed
Area under speed-time graph = distance moved
Gradient of
displacement
-time graph = velocity
Gradient of velocity-time graph =
acceleration
Area under velocity-time graph = displacement
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How do you calculate distance from a speed-time graph?
Area
between graph and time axis
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How do you calculate acceleration from a velocity-time graph?
Gradient
of the velocity-time graph
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How do you find displacement from a velocity-time graph?
Area between graph and
time axis
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What is the average speed of Jim during the first 15 seconds?
4 m/s
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What is Jim's average speed for the entire 25 seconds?
2.4 m/s
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What is the final displacement of the soldier after his march?
Calculate based on his
movements
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What are the key concepts of motion graphs?
Gradient of distance-time graph
=
speed
Gradient of speed-time graph =
acceleration
Area under speed-time graph
= distance
Gradient of
velocity-time graph
= acceleration
Area under velocity-time graph =
displacement
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