###### Asked by Carl Buster

# If you were standing in a bus moving at a constant velocity would you have to lean and a special way to compensate for the bus motion?

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## Related Questions

###### Asked in Science

### What is the formula for acceleration?

a=dv/dt.
By definition, acceleration is the rate of change of velocity.
In mathematical notation, it is given as the formula stated
above.
Two special cases:
1. When acceleration is constant:
The rate of change is a constant. Therefore, it can be
calculated by:
a=(vf - vi) / t
where a is acceleration
vf is final velocity
vi is initial velocity
and t is time taken
2. When velocity is constant:
Velocity is not changing. The rate of change of velocity is
zero. Acceleration has to be zero.
* * * * *
Note that velocity and acceleration are both VECTORS. Therefore,
an object going round in a circle, at CONSTANT speed, has velocity
and acceleration that are changing all the time - because the
direction of motion is changing.

###### Asked in Albert Einstein

### What is Albert Einstein's special theory of relativity?

The special theory of relativity was proposed in 1905 by Albert
Einstein and states that:
1. The speed of light is a constant, and
2. All of the laws of physics are applicable within any given
inertial reference frame.
Special relativity deals with relative motion at a constant
velocity, as opposed to General relativity. An inertial reference
frame is formed by a group of objects traveling together at a
constant velocity.
For example: If you were in a car moving at a constant 60mph
with no bumps in the road to disrupt you, you could throw a ball,
perform experiments, and do virtually anything as though you
weren't moving at all.
Because of the speed of light being constant for all inertial
reference frames, however, special relativity also implies that the
faster an object moves, the slower time becomes for that
object. Because of this, the theory of relativity is essential for
determining speeds, distances and time at very high velocities.

###### Asked in Physics, Chemistry, Miley Cyrus

### If a crate is stationary on an incline does it mean that it is in the state of equilibrium?

If a crate placed on an inclined plane is moving at constant
velocity or not moving at all -- which is really a special case of
constant velocity where the velocity is zero -- then the sum of the
forces acting upon it is zero. We can say that it is in a state of
equilibrium, where all forces acting upon it are in perfect balance
and cancel themselves out. A free-body diagram is often used to
represent a body and the forces acting upon it and helps us
visualize the relationship of the vector forces. See this link:
http://en.wikipedia.org/wiki/Free-body_diagram#Example

###### Asked in Physics

### What the velocity uint?

###### Asked in Physics

### What is velocity quantity?

The average speed of an object is defined as the distance
traveled divided by the time elapsed. Velocity is a vector
quantity, and average velocity can be defined as the displacement
divided by the time. For the special case of straight line motion
in the x direction, the average velocity takes the form:

###### Asked in Physics

### What is relativistic velocity?

###### Asked in Science, Physics

### Motion with constant velocity is a special case of motion with constant acceleration?

Motion with constant velocity is motion without acceleration.
That is, there is no force being applied to the object in motion.
One could argue that the acceleration is constant in that case, but
the constant value is zero.
Now, general relativity tells us that gravity and acceleration
are indistinguishable from each other for a point mass being
affected by either (meaning that if you're accelerating, you cannot
tell just by the effect of the force whether it's due to an actual
force, F=ma, or another massive object causing gravitational
attraction). So in some ways, one could argue that the force of
gravity is identical to constant acceleration. The difference is
that gravity is caused by the presence of mass which "warps"
space-time, so the acceleration felt is actually caused not by a
force acting directly on the object, but the object is moving at a
"constant velocity" in the equivalent flat (non-warped) space-time,
and due to the presence of another mass causing a gravitational
attraction, acceleration is felt.
Think of it as standing on the center of a mattress. Your weight
causes the middle of the mattress to push down, and if you had
something like a basketball sitting in the corner of the mattress,
it would begin rolling toward you. In that example, the mattress is
space-time, the basketball the body in motion, and you the mass
causing gravitational attraction.
In that sense, since the object would be moving at a constant
velocity in a flat space-time (like the ball sitting still on the
mattress), warping space-time does not apply a true force to the
ball, the causes it to appear to accelerate nonetheless. This
appearance is due not to a force acting directly on the ball, but
acting on the space-time in which it inhabits.

###### Asked in Physics

### If a baseball has zero velocity at some instant is the acceleration of the baseball necessarily zero at that instant explain and give examples?

oh my...
The acceleration is the first derivative of the speed /
velocity.
Mathematically the first derivative of a constant function is
null. By the way, the acceleration is null regardless of the actual
speed, provided this speed is not changing (null is a only special
case of a constant).
The notion of derivative is linked to the notion of values at
limits, so when we say the speed is constant, actually we want to
say the difference in speed in this very infinitesimal period of
time we are interested in was zip, and the derivative of zip is
null.
Examples? Well there is no example on earth where you accelerate
while not moving.

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