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Physics laws of motion
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Cards (44)
What is a scalar quantity?
A quantity with just size (
magnitude
)
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What is a vector quantity?
A quantity with
size
and
direction
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What are examples of scalar quantities?
Mass
Distance
Energy
Time
Power
Speed
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What are examples of vector quantities?
Displacement
Acceleration
Weight
Velocity
Gravitational field strength
Momentum
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How do vectors represent direction and magnitude?
Using
arrows
to show direction and length
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What does Newton's first law state about resultant force?
If resultant force is 0, motion remains
constant
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What happens to a stationary object with no resultant force?
It
remains
stationary
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What does resultant force indicate when not in equilibrium?
Object is
accelerating
, decelerating, or changing direction
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What are the two types of forces?
Contact forces
Non-contact forces
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What is an example of a contact force?
Friction
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What is an example of a non-contact force?
Magnetic force
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What does Newton's third law state about interacting objects?
They exert
equal and opposite forces
on each other
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What are the characteristics of a third law pair of forces?
Equal size
,
opposite direction
,
different objects
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What is speed defined as?
How far something travels in a
given
time
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What is velocity defined as?
Speed
in a given direction
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What is the average walking speed?
5 m/s
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What is the average running speed?
3 m/s
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What is the average cycling speed?
6
m/s
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What is acceleration defined as?
The rate of change of
velocity
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How is change in velocity calculated?
Final velocity
-
starting velocity
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What is Newton's second law formula?
F
=
ma
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What does the center of mass represent?
The point where
gravity
appears to act
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What happens to an irregular object when it hangs?
It falls directly
below
the pivot
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What happens to a regular object regarding lines of symmetry?
It
falls
along
its
lines
of
symmetry
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What does the gradient represent in a velocity-time graph?
Velocity or
speed
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What is inertia?
The tendency of an
object
to resist
changes
in motion
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What is the relationship between mass and weight?
Mass is
not
equal
to weight
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What is weight defined as?
The
force
acting on an object due to
gravity
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What does gravitational field strength depend on?
The
location
of the object in the universe
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What is the unit of weight?
Newtons (N)
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What is the unit of mass?
Kilograms
(kg)
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How is weight calculated?
Weight =
mass
x
gravitational field strength
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What is the unit of gravitational field strength?
Newtons
per
kilogram
(N/kg)
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What are the parts of the practical experiment described?
Part 1:
I =
Force
(changing mass on holder)
D =
Acceleration
(
light gate
and
data logger
)
C =
Mass
(moving masses from trolley to holder)
Part 2:
I = Mass of trolley (added more masses)
D = Acceleration (light gate + data logger)
C = Force (keep the mass on the holder)
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What is the relationship between acceleration and mass of the trolley?
Acceleration is directly
proportional
to mass
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What is the relationship between force and acceleration?
Force is directly
proportional
to acceleration
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What is the relationship between force and mass?
Force is directly
proportional
to mass
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What is the relationship between mass and acceleration?
Mass is
inversely proportional
to acceleration
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What is the formula for calculating acceleration?
a
=
a =
a
=
Δ
V
t
\frac{\Delta V}{t}
t
Δ
V
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What is the formula for calculating force?
F
=
F =
F
=
m
a
ma
ma
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