Motion - Riverside Prep PAC Middle School

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Transcript Motion - Riverside Prep PAC Middle School

Mrs. Larm
 Motion
is when its distance from another
stationary object is changing
 Using
a reference point
 Describing

distance
Measurement are in ____________________.
 Formula
is ______________________
 Constant
 Average

speed: same speed
speed: changing speeds
total distance / total time
 Velocity

is speed and direction
Examples
 Graphs
(x,y)
 Slope:
y₂ - y₁/ x₂ - x₁
 Slope




intercept form: y = mx + b
m= slope
b = y intercept
x = linear line
x ² = U shaped curved line (parabola)
 Why
do you need a reference point to know
if an object is moving?
 What is the difference between an object’s
speed and an object’s velocity?
 The bamboo plant grows 15 cm in 4 hours. At
what average speed does the plant grow
Times (s)
Baby Sarah distance
(m)
Baby Scott distance
(m)
0
0
0
1
0.5
0.4
2
1
0.8
3
1.5
1.2
4
2
1.6
What is each baby’s speed?
 Distance
= speed x time
 Acceleration:
increasing speed, decreasing
speed, or changing direction
 Calculating



acceleration:
Acceleration= final velocity – initial velocity/ time
Time is squared m/s²
An eagle accelerated from 15m/s to 22m/s in 4 seconds.
What is the eagles average acceleration?
 Linear

means
Example
 Nonlinear

Example
means
 Unbalanced

acting forces are unequal and will cause the
object to move.
 Balanced

force:
forces:
All forces are equal and the object will not
change its motion or nonmotion
 That
an object at rest will remain at rest and
an object that is moving at a constant
velocity will continue moving unless acted
upon by an unbalanced force.
 Inertia: is the tendency of an object to resist
change in motion.
 Mass: is the amount of matter in an object.
 The
net force on an object is equal to the
product of its acceleration and its mass
 Force( newtons) = mass x acceleration
 Acceleration
= force / mass
 States
that if one object exerts a force on
another object, then the second object
exerts a force of equal magnitude in the
opposite direction on the first object
 Friction
acts in the opposite direction of
motion
 Two factors:


Type of surface
How hard the surfaces are push together (weight)
 Momentum
= mass x velocity
 Two
moving objects: transfer of speed from
the last object to the first object
 One
moving object: transfer of speed from a
moving object to a stopped object which
causes it to move a rate of the moving object
 Two
connected object: share the speed