Physics
terms and questions from physic class notes. Chapter 11 sections 1 & 2. section one is on distance and displacement. section two is on speed and velocity.
Terms
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- constant acceleration
- is a steady change in velocity.
- how are speed and velocity different?
- velocity is a description of both speed and direction of motion. speed is the ratio of the distance and object moves to the amount of time it takes for the object to move.
- the slope of a line on a distance-time graph is?
- speed
- distance
- is the length of the path between two points.
- how do velocities add?
- two or more velocities add by vector addition.
- free fall
- is the movement of an object toward earth solely because of gravity.
- objects faalling near earth's surface accelerate downward at a rate of?
- 9.8 m/s/s or m/s squared
- how do you add displacements?
- add displacements using vector addition.
- relative motion
- is movement in relation to a frame of reference.
- true or false? the bigger the vector the bigger the displacement.
- true
- what is the SI unit of speed?
- it is meters per second. (m/s)
- how are changes in velocity described?
- the rate at which velocity changes is called acceleration.
- constant acceleration
- is represented on a speed-time graph by a straight line. the slope of the line is the acceleration.
- how can you find the speed from a distance-time graph?
- the steeper the slope the higher the constant speed.
- the slope of a speed-time graph is?
- acceleration
- how are instantaneous speed and average speed different?
- average speed is the total distance divided by the time it takes to travel a distance. instantaneous speed is the rate an object is moving at a given moment in time.
- deceleration
- is an acceleration that slows an objects speed.
- instantaneous speed
- v, is the rate at which an object is moving at a given moment in time.
- displacement
- is the direction from the starting point and the length of a straight line from the starting point to the ending point.
- resultant vector
- which is the vector sum of two or more vectors.
- vector
- is a quantity that has magnitude and direction.
- what is necessary to describe motion accurately and completely?
- a frame of reference.
- a frame of reference
- is a system of objects that are not moving with respect to one another.
- average speed
- is the total distance traveled, d, divided by the time, t, it takes to travel that distance.
- acceleration
- the rate at which velocity changes. and or how an object speeds up from o to what ever it could be to 50 for example
- how can you calculate acceleration?
- you can calculate acceleration for straight-line motion by dividing the change in velocity by the total time.
- velocity
- is a description of both speed and direction of motion. (velocity is a vector.)
- how does a speed-time graph indicate acceleration?
- by constant speed
- how are distance and displacement different?
- distance is the length from one point to another. displacement is the direction and the length from a starting point to an ending point.
- speed
- is the ratio of the distance an object moves to the amount of time it takes for the object to move.
- non-linear graph
- a curve connects the data points that are plotted.