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Physics
1: Speed, Distance & Time
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Sophia Robinson
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Cards (44)
What is the difference between speed and velocity?
Velocity includes
direction
; speed does
not
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How are speed and velocity measured?
Both are measured in
m/s
,
km/h
, or
mph
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Can an object have constant speed and changing velocity?
Yes, if it changes
direction
while maintaining speed
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What is the formula for average speed?
Average speed =
Distance moved
/
Time taken
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How do you calculate the average speed of a cat that moves 20 m in 35 s?
Average speed =
20
/
35
=
20/35 =
20/35
=
0.57
m/s
0.57 \text{ m/s}
0.57
m/s
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How long does it take for the cat to skulk 75 m at 0.57 m/s?
Time
=
75
/
0.57
=
75/0.57 =
75/0.57
=
132
s
132 \text{ s}
132
s
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What is acceleration?
Acceleration is how quickly
velocity
is changing
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What units are used for acceleration?
Acceleration is measured in
m/s²
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What does a negative acceleration value indicate?
It indicates the
object
is slowing down
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What is the formula for acceleration?
Acceleration =
Change in Velocity
/
Time taken
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How do you calculate acceleration if an object changes from 2 m/s to 6 m/s in 5.6 s?
Acceleration =
(
6
−
2
)
/
5.6
=
(6-2)/5.6 =
(
6
−
2
)
/5.6
=
0.71
m/s²
0.71 \text{ m/s²}
0.71
m/s²
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What is the formula relating final velocity, initial velocity, acceleration, and distance?
v²
=
u²
+
2as
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What is the final speed of a van decelerating from 23 m/s at 2.0 m/s² over 112 m?
Final speed =
9
m/s
9 \text{ m/s}
9
m/s
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What does a distance-time graph show?
It shows how far something has
travelled
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What does the gradient of a distance-time graph represent?
The gradient represents the
speed
of the object
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What do flat sections on a distance-time graph indicate?
Flat sections indicate the object is
stopped
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What does a steeper graph on a distance-time graph indicate?
A steeper graph indicates the
object
is going
faster
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What do curves on a distance-time graph represent?
Curves represent
acceleration
of the object
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How do you calculate average speed from a distance-time graph?
Average speed =
Total distance
/
Total time
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What does a velocity-time graph show?
It shows how an object's
velocity
changes
over
time
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What does the gradient of a velocity-time graph represent?
The gradient represents
acceleration
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What do flat sections on a velocity-time graph indicate?
Flat sections indicate
steady speed
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What do uphill sections on a velocity-time graph represent?
Uphill sections represent
acceleration
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What do downhill sections on a velocity-time graph represent?
Downhill sections represent
deceleration
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What does the area under a velocity-time graph represent?
The area represents the
distance travelled
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What is gravity?
Gravity is the
force
of
attraction
between
masses
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How do you calculate the distance travelled in a time interval from a velocity-time graph?
Distance =
Area
under the graph
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What effect does gravity have on objects on a planet's surface?
It makes all things
accelerate
towards the ground
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What is the acceleration due to gravity on Earth?
About
10 m/s²
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How does weight differ from mass?
Weight is caused by
gravity
; mass is not
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Does an object's mass change on the Moon?
No, mass remains the same
everywhere
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How is mass measured?
Mass is measured in
kilograms
(kg)
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How is weight measured?
Weight is measured in
newtons
(N)
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What is the formula relating weight, mass, and gravitational field strength?
Weight
=
Mass
x
Gravitational
field
strength
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What is the weight of a 5 kg mass on Earth?
Weight =
5
×
10
=
5 \times 10 =
5
×
10
=
50
N
50 \text{ N}
50
N
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What is the weight of a 5 kg mass on the Moon?
Weight =
5
×
1.6
=
5 \times 1.6 =
5
×
1.6
=
8
N
8 \text{ N}
8
N
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What are the key differences between mass and weight?
Mass is the amount of "stuff" in an object
Weight is the force of
gravity
on an object
Mass is constant; weight varies with gravity
Mass is measured in
kg
; weight in
N
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What are the effects of gravity on objects near a planet?
Causes objects to
accelerate
towards the ground
Gives objects weight
Keeps
celestial bodies
in orbit
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What are the characteristics of distance-time graphs?
Gradient
indicates speed
Flat sections indicate stopping
Steeper graphs indicate faster
speeds
Curves indicate
acceleration
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What are the characteristics of velocity-time graphs?
Gradient
indicates
acceleration
Flat sections
indicate
steady speed
Uphill sections
indicate acceleration
Downhill sections
indicate
deceleration
Area under the graph
indicates
distance travelled
View source
See all 44 cards
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