unit 2 acceleration and free fall

Can an object be accelerated while traveling at a constant speed? Why or why not?

yes it can, because acceleration would be needed in order to maintain a constant rate of speed

can an object be accelerated while traveling at a constant velocity? why or why not?

no it cant, this is because acceleration is defined by the change in velocity

light travels in a straight line at a constant speed of 3×10^8 m/s. what is its acceleration?

The acceleration is 0, there is no change in speed (constant velocity)

in another lab, a group is rolling a marble down the ramps in the gym, studying the change in speed as it rolls. A.) what procedure would they follow?

They will follow a procedure of starting the ball in the same place each time and will measure the amount of time it takes for the marble to travel at different intervals

in another lab, a group is rolling a marble down the ramps in the gym, studying the change in speed as it rolls. B.) What 2 variables of data should they collect?

They should collect the amount of time it takes for the marble to run down the ramp at each interval, as well as recording the change in acceleration

in another lab, a group is rolling a marble down the ramps in the gym, studying the change in speed as it rolls. C.) how could they change the set up to change the speed of the marble?

they could change the set up by changing the incline/decline of the ramp and how often they stop the marble

what do you know or what would you be looking for based on the following phrase. 1.) how far did she travel

variable: distance unit: M

what do you know or what would you be looking for based on the following phrase. 2.) how fast was he going?

variable: speed unit: m/s

what do you know or what would you be looking for based on the following phrase .3.) how long does it take?

variable: time unit: seconds

what do you know or what would you be looking for based on the following phrase. 4.) starting from rest

variable: initial velocity unit: Vi

what do you know or what would you be looking for based on the following phrase. 5.) comes to a stop

variable” final velocity unit: Vf

gravity makes all things fall to earth at what acceleration?

-9.8 m/s²

a massive rock falls to earth at the same pace as a small pebble in a vacuum. Why?

because there is no air resistance on either of them.

a feather and a penny are dropped from the same height at the same time in a vacuum tube. which one hits the bottom first? why?

they will hit the bottom of the vacuum tube at the same time because there is no air resistance

an object drops from a certain height. the vertical velocity….

increases

an object drops from a certain height. the horizontal velocity….

is zero

an object drops from a certain height. the acceleration…

stays the same

if you plotted a rock free falling to earth on a P-T graph, the line would be….

curved

if you plotted a rock free falling to earth on a V-T graph, the line would be….

straight