Chapter 4- Linear Motion
Total distance/ total time is how to calculate (blank).
Average speed
The time passed since the beginning of any motion is called?
Elapsed time
True or False: In real life, air resistance has no affect on the acceleration of a falling object.
False
True or False: Speed is Velocity in a given direction.
False
True or False: Speed is a vector quantity.
False
An object moving under the influence of a gravitational force only is said to be in
Free fall
If air resistance is negligible, a falling object can be considered...
Free fall
Speed= distance/
Time
True or False: Acceleration is a vector quantity.
True
True or False: For each second of free fall, an object falls a greater distance than it did in the previous second.
True
True or False: The speed of a plane can be described as 300 mi/h.
True
True or False: The velocity of a car can be described as 60 km/h to the north.
True
True or False: Velocity is a vector quantity.
True
True or False: When we describe the motion of one object with respect to another, we say that the object is moving relative to another object.
True
The letter used for both speed and velocity in the equation for instantaneous speed
V
The equation for speed and velocity
V= gt
What are the equations used to calculate velocity and distance for a free falling object?
V= gt D= 1/2 gt squared
If a car is traveling around a curve on a highway at a constant, is the car accelerating? Why?
Yes because the direction is changing
What is the instantaneous speed of an object that is at its highest point when it's thrown straight up in the air?
0
At the end of time t, an object in free fall has fallen a distance equal to the equation...
1/2 gt squared
An approximate value of the acceleration of an object in free fall is.
10 m/s squared
If your average speed is 30 kilometers per hour and your trip took 1 hour, what was the total distance covered?
30 kilometers per hour
If you travel 80 kilometers in 2 hours, what was your average speed.
40 kilometers
An accurate value of acceleration of an object in free fall is.
9.8 m/s squared
What is the acceleration of an object when descending in the air?
9.8 m/s squared downward
When an object is thrown straight up into the air, what is its acceleration when it is moving upward?
9.8 m/s squared downward
Change in velocity/ time interval is how (blank) is calculated.
Acceleration
The rate at which the velocity is changing is considered what?
Acceleration
The word for the rate at which velocity changes is.
Acceleration
Explain why a dropped coin reaches the ground before a feather.
Because the air resistance of the feather hits terminal velocity faster meaning that it will fall slower than the coin.
Explain what would happen if a coin and a feather were dropped in a vacuum tube.
Both the objects would keep their acceleration
The equation for distance is
D= 1/2 gt squared
Acceleration is a change in speed, a change in (blank), or both.
Direction
The word for how far an object has fallen is.
Distance
The letter used to represent acceleration due to gravity is.
G
In physics, the term acceleration applies to both (blank) and (blank) in speed.
Increase and decrease
The speed at any instant and the speedometer on a car shows what?
Instantaneous speed
What unit represents acceleration?
Km/s
An object is (blank) if it's position relative to a fixed point is (blank).
Moving, changing
The relationship between distance and time on a graph is (blank) and the curve is (blank).
Quadratic and parabolic
How fast an object is moving is defined as.
Speed
The word for how fast something freely falls from rest after and elapsed time is.
Speed
What does the slope of the line at each point represent?
Speed increases as time passes
If either the (blank) or the ( blank) is changing (or both are), then the velocity is changing.
Speed, direction
A driver is going 20 kilometers per hour down the street. What is the driver's speed relative to?
The street