Definitions
The objects or processes, enclosed in imaginary boundaries, that scientists study are called _____________________
Systems
According to ancient Greek philosophers, why does smoke rise from a campfire?
Smoke “desires” to ascend to the heavens
Given the following the numbers use the contained units to tell if the number is
describing distance, speed, acceleration, or velocity.
150 km
53 m/s²
Distance
Acceleration
What is a vector?
Quantity represented by arrows with both direction and magnitude
This term compares the change in the value of the quantity to a certain span of time:
Rate
A __________________ is defined as the value of a system’s position along an axis.
Coordinate
. The scientific word for an unbroken expanse or series, such as time, is a(n) ___________.
Continuum
Is acceleration vector or scalar?
Can be both
What is a vector quantity?
Displacement
When is displacement?
When the final and initial position are the same.
In kinematics, _______________ refers to the points of reference used to anchor observations
Landmarks
Motion occurs when a system’s _________ changes during an interval of _____________.
Position, time
If an object shows down, is it accelerating?
Yes; in a negative direction
Displacement divided by a time interval equals
Velocity
A certain digital camera in “movie mode” can take 20 pictures per second. If a photographer presses the shutter button when his watch indicates 32s and 35s, what is the time interval and how many photos did he take?
3 seconds, 60pictures
This refers to the reference lines along which dimensional units are measured:
Axis
What are the three parts that mechanics can be broken down into?
- Kinematics
- Dynamics
- Statics
A child is riding a carousel at a state fair and his mother watches from a bench nearby. A couple on a motorcycle speeds up going past both of them. Which of the people show(s) an accelerated reference frame?
Couple
When are displacement and distance equal?
When an object travels in a straight line in one direction
To analyze the pushes and pulls on the framework of radio telescopes, one would use:
- Dynamics
- Statics
- Kinematics
Statics
Kinetics is used to measure:
Speed, acceleration, velocity
Which of the following is not accelerating?
A ball swinging on a string.
A car slows as it approaches a red stoplight.
A jet plane taking off from an aircraft carrier.
A runner jogging at 2.5 m/s.
A runner jogging at 2.5 m/s.
What is acceleration and how do you solve it?
Rate of change in speed or velocity during a given time interval; Change in speed or velocity/time interval
Two cars are driving toward each other at the same speed on a straight road. If they both turn around and drive at the same speed as before, but in the opposite direction, how will their velocities change?
Displacement decreases, velocity decreases
Mechanics can be split into 3 categories: list and define them:
Kinematics: how things move
Dynamics: what causes things to move
Statics: how stationary things react to push/pull