Physic (unit 2)
Terms in this set (26)
A physical measurement used to describe a set of physical conditions.
A quantity that has magnitude (amount) only.
A quantity that has magnitude (amount) and direction.
The study of motion without regard to what causes the motion.
How far an object has moved without regard to direction (A scalar quantity.)
The amount of change in position of an object in a particular direction. (A vector
The rate of distance moved. Basically this is velocity without direction (A scalar quantity.)
The rate of change of position or the rate of displacement. (A vector quantity.)
Velocity over some period of time. Also, the single instantaneous velocity an
object would need to go for the entire time and distance.
Velocity at an instant in time (infinitely short period of time.)
Instantaneous velocity at the beginning of a time period.
Instantaneous velocity at the end of a time period.
The rate of change of velocity. (A vector quantity.)
What is the difference between a scalar and vector quantity?
Both have a magnitude (amount) but a vector quantity also has a direction. Scalar quantities do not have direction.
Give examples of scalar and vector quantities.
Scalar - time, temperature, distance, speed.
Vector - displacement, velocity, acceleration, force.
What does it mean to say that motion is relative?
The motion of an object must be measured against (relative to) a different object. You cannot put the ruler on the object you are measuring.
What object do we usually measure the motion of an object relative to?
Usually (for most of our ordinary, everyday experiences) the surface of the Earth. If you are measuring the movement of the Earth you cannot do this. You must measure relative to something like the Sun.
Distinguish between instantaneous and average velocity
Instantaneous velocity is how fast an object is moving at an instant (infinitely small period) of time. The average is over some longer period of time.
What does slope on a position (displacement) vs. time graph represent?
What does slope on a velocity vs. time graph represent?
Distinguish between velocity and acceleration
Velocity is how fast you are moving in a certain
direction and acceleration is the rate at which the velocity is changing.
Of the quantities displacement, velocity, and acceleration; which can be negative?
All can be
What is the rule for whether an object is speeding up or slowing down during acceleration based on the signs of initial velocity and acceleration?
If initial velocity and acceleration have the same sign, the object will speed up. If initial velocity and acceleration have different signs, the object will slow down.
Can an object have a negative acceleration and still be speeding up?
If yes, give an example. If an object is initially heading in the negative direction, a negative acceleration is needed to make it go faster.
What are the three ways an object can accelerate?
Speed-up, Slow-down or change Direction
What are the three parts of a car that are used to cause acceleration?
Accelerator (gas petal,) break,