Frame of Reference
If two objects are moving toward each other at different speeds the relative speed is found by add or subtracting the speeds?
adding.
On a distance time graph, a horizontal line means. . .
the object is at rest.
The term for acceleration towards the center of the earth
gravity
Has mass a takes up space. Remains constant in space and on the earth's atmosphere.
matter
The tendency for an object at rest to remain at rest and an object in motion to remain in motion.
Inertia
If two objects are moving in the same direction at different speeds, the relative speed can be found by adding or subtracting the different speeds?
subtracting
In a speed time graph a positive slope means? A negative slope?
moving forward, moving backward.
On a velocity and time graph, what does a straight line represent?
constant speed.
Change in distance per unit time with direction
Velocity
True or False: Two objects of different masses will hit the ground at the same time and with the same Force
False, Same time but different force.
A pilot and co-pilot are not moving relative to each other if both are sitting in the plane? True or False
True
If an object is dropped from 20 meters and hits the ground after 5 seconds, what was its speed?
4 m/s
A car changes speed from 2 m/s to 10 m/s. What else do we need to calculate acceleration
change in time
Change in speed per unit time
Acceleration
True or False Gravity affects mass and weight.
False, gravity will affect weight but not mass
A hare approaches a non moving tortoise at 2 m/s South. At what relative speed is the tortoise moving to the hare?
2 m/s North
An object moves from 4 meters to 10 meters in 2 seconds. What was its speed?
2 m/s
In a speed time graph, a positive slope means. . .
the object is accelerating.
How one determines the motion of an object, is relative to position and time and changes with perspective.
point of reference.
For every action. . . .
there is an equal and opposite reaction.
If two objects are passing each other would you add the speeds or subtract the speeds to find the speed relative to each other?
add
Speed is a ________ measurement, while velocity is a ___________ measurement.
scalar, vector
An object at rest falls backwards at a rate of 6m/s in 3 seconds. What was its acceleration?
2 m/s2
an objects final position from its initial position
displacement
Force is the product of ?
mass and acceleration