1:
Answer:
Speed is a measure of distance traveled by an object in a certain duration of time. It helps in determining the change of position of an object with respect to time. Speed is a scalar quantity because when object is covering a distance, it does not has to be in a particular direction, so speed itself do not has a specific direction which makes it scalar.
The system International unit to measure the speed of an object is meter per second or m/sec.
If we have to calculate the speed of an object, we simply divide the distance that a body has traveled by the time in which it traveled through that distance. For instance: An object covered the distance of two mile in 1 hours, this means that the distance will be 2 miles/ hour.
The equation for speed is = speed= Distance/ Time
v = d/t
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2:
Answer:
Yes acceleration will be zero.
Acceleration is the measure of rate of change of an object's velocity in a certain duration of time. As per Newton's second law of motion, the acceleration in actual results due to all net forces acting on a body.
The equation of acceleration is= a= change in velocity/ change in time
a=dv/dt. V is constant. The derivative of a constant is equal to zero. So, a=0.
Velocity is a vector. A vector has direction and magnitude.
The magnitude of the vector velocity is speed.
So, let's say that the vector is:
v = vx (i) + vy (j)
You can rewrite it as:
v = | v | (cos (angle) i + sin (angle) j)
v: is the velocity vector (it has direction in which are the vertical and horizontal components)
| v |: is the speed (magnitude of the vector).
Acceleration is defined as the derivative of the velocity vector
a = dv / dt
So, as you can see
Velocity is a vector. So, it has direction.
But, because the module of that vector | v | (speed) is constant, so when deriving component to component we have to:
a = dv / dt = d (| v | (cos (angle) i + sin (angle) j)) / dt
a = dv / dt = | v | (d (cos (angle) i) / (dt) + d (sine (angle) j)) / dt)
a = dv / dt = 0 (it is a function that does not depend on time because speed |v| is constant.)
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3:
Answer:
If we have to calculate the speed of an object, we simply divide the distance that a body has traveled by the time in which it traveled through that distance. For instance: An object covered the distance of two mile in 1 hours, this means that the distance will be 2 miles/ hour.
The equation for speed is = speed= Distance/ Time
v = d/t
The system International unit to measure the speed of an object is meter per second or m/sec.
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4:
Answer:
This is an example of speed and not velocity.
As we discussed above, speed is a measure of distance traveled by an object in a certain duration of time. It helps in determining the change of position of an object with respect to time.
When a car moves it changes directions unless it is given that it has to travel straight from one specific point to another. In the question, the family is traveling from South to Florida but it is not mentioned it is travelling through road or by air or in what direction. Ofcourse the journey would not be in a certain direction, there will be changes in the direction during travel. So this is speed not velocity. Because in velocity we are given specific points of direction.
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5:
Answer:
Acceleration is the measure of rate of change of an object's velocity in a certain duration of time. As per Newton's second law of motion, the acceleration in actual results due to all net forces acting on a body.
The equation of acceleration is:
a= change in velocity/ change in time.
a= final velocity- initial velocity/ time
Therefore, if we need to measure the acceleration, we will use second law of motion by Newton and we will simply minus the value of its final velocity from its initial velocity and divide the resultant value with time.
The system international unit of acceleration is meter per second square.
Hope it help!