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Science
Physics
Science Gavin Alveti
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Gravity
Terms in this set (71)
Newton's First Law
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
reference point
non-moving point from which motion is measured
motion
An object's change in position relative to a reference point.
needed to determine the position of an object
reference point
describes how far an object has moved
distance
SI unit for length or distance
meter
shorter distances are measured in
centimeters
when you want to convert inches to centimeters multiply by
2.54
when you want to convert centimeters to inches multiply by
.39
the distance and direction of an object's change in position from a reference point
displacement
rate of motion and distance traveled per unit time
speed
SI unit of time
second (s)
instantaneous speed
the speed of an object at one instant of time
average speed
total distance divided by total time
to determine direction you need to know the
velocity
velocity
Speed in a given direction
can change even when the speed is constant
velocity
equation for speed
speed = distance/time
equation for time
distance/speed
equation for distance
speed x time
Acceleration
rate of change of velocity
Acceleration occurs when
An object changes its speed, direction, or both.
slope=
speed
steeper slope=
faster speed
straight line=
no motion
flat line=
constant speed
single point=
instantaneous speed
speed=
distance/time
acceleration is indicated on a graph by what
curved line
changing slope =
changing velocity
rate of motion and distance traveled per unit
speed
speed at a given instant
instantaneous speed
average speed=
total distance/total time
the rate of change of velocity
acceleration
an object slowing down is
accelerating
acceleration has direction just like
velocity
if the acceleration is in the same direction as the velocity, the speed increases and the acceleration is
positive
If the speed decreases, the acceleration is in the opposite direction from the velocity, and the acceleration is
negative
equation for acceleration
a=vf-vi/t
positive acceleration=
speeding up
negative acceleration=
slowing down
a roller coaster starts down a hill at 10 m/s. Three seconds later, its speed is 31 m/s. What is the roller coaster's acceleration?
7m/s^2
How long will it take a car traveling 30 m/s to come to a stop if its acceleration is -3 m/s2?
10s
what is gravity
9.8 m/s^2
what is a force
A push or a pull
Equation for force
F=ma
what is mass measured in
kg or grams
what is acceleration measured in
m/s^2
Does force always change velocity?
no
unbalanced forces that are not opposite and equal
net force
When two or more forces act on an object at the same time, the forces combine to form the
net forces
the tendency of an object to resist any change in its motion
inertia
The greater the mass of an object is, the greater its
inertia
inertia
increases as mass increases
true or false a net force causes motion
false a net force causes a CHANGE in motion
friction
A force that opposes motion between two surfaces that are in contact
Three types of friction
static, sliding, rolling
friction is greater
between rough surfaces
formula for kinetic energy
KE=1/2mv^2
formula for potential energy
weight x height
formula for work
work = force x distance
formula for power
work/time
the frictional force that prevents two surfaces from sliding past each other.
static friction
the force that opposes the motion of two surfaces sliding past each other.
sliding friction
the frictional force between a rolling object and the surface it rolls on.
rolling friction
force that air exerts on a moving object to oppose its motion
air resistance
air resistance depends on
speed, surface area, shape, and density of fluid
maximum velocity reached by a falling object
terminal velocity
What force would be required to accelerate a 40 kg mass by 4 m/s2?
160N
A 4.0 kg shotput is thrown with 30 N of force. What is its acceleration?
7.5m/s^2
Mrs. J. weighs 557 N. What is her mass?
56.8kg
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