51 terms

speed

rate of change of position, which can be calculated by diving the distance traveled by the time it take tot travel that distance

Speed = Distance divided by time

Speed = Distance divided by time

average speed

Average speed is found by dividing the total distance traveled by the time taken

instantaneous speed

the speed of an object at one instant of time

velocity

the speed of the object and direction of its motion

accleration

rate of change of velocity; can cause an object to speed up, slow down, or turn, and can be calculated by the change in velocity divided by the time it takes for the change to occurs

mass

is the amount of matter in the object. In SI units the unit for mass is the kilogram

inertia

tendency of an object to resist a change in its motion

momentum

is a measure of how hard it is to stop the object

momentum = mass times velocity or p=mv

momentum = mass times velocity or p=mv

law of conservation of momentum

the total momentum of objects that collide with each other is the same before and after the collision

What is true about all matter in the universe?

it is constantly in motion

Define when something is in motion

is is changing in position

What do you need to determine whether something has changed position

a point of reference

what is distance

how far you or an object has moved

Define displacement

it is the direction and difference in position between your starting point and your ending

What is speed

Speed is the distance traveled divided by the time taken to travel the distance

Formula for speed is

Speed = distance/time

What is the speed of 100 meters in 10 seconds

10 meters/second

What is average speed?

divide total distance traveled by time taken

What do you know about object in motion and its speed?

an object in motion can change speeds many times as object speeds up or slows down

Instantaneous speed

the speed of an object at one instant of time

What is one way that you can view two objects traveling at different speeds

by plotting data on a graph

Velocity

defined as the speed of an object and direction of its motion

What is acceleration

change in velocity divided by the time it takes for the change to occur

What is true about velocity and acceleration

they both have a direction

If an object speeds up in which direction is the acceleration

the acceleration is in the direction that the object is moving

What happens if the direction of the acceleration is at an angle to the direction of motion?

the direction of motion will turn toward the direction of acceleration

If an object slows down in which direction is the acceleration

the acceleration is in the opposite direction that the object is moving

What can you say about an object whose speed is increasing

the object is accelerating

When the speed is decreasing what can you say about the direction of acceleration

the direction of acceleration is opposite to the direction of motion

Acceleration is

(Final speed minus initial speed) divided by time

What is the formula for acceleration

(Sf-Si)/t

If the acceleration formula is positive what do you know about the object

the object is speeding up in the direction of the motion

If the acceleration formula is negative what do you know about the object

the object is speeding up in the opposite direction of motion

If you graph an acceleration line, what do the x axis and what is the y axis represetn

x axis is time; y axis is speed

if the acceleration line has a positive slope what do you know

the object is speeding up

if the acceleration line has a negative slope what do you know

the object is slowing down

How do you know if an object has changed position?

an object has changed position if it moves relative to a reference point

What two different things does a horizontal line represent on a speed-time graph

an acceleration of zero OR constant speed

when is an object in motion

if it is changing position

Define distance

distance measures the length of the path that an object follows during its motion

What is displacement?

displacement is the change in position between the starting point and the ending point AND the direction from the start to end points

what is speed?

Speed equals distance divided by time

what can a distance-time graph be used to show?

it can be used to show motion

if one has a graph with multiple lines on a distance time graph, what do you know about the line of the fastest moving object

confirm with dad

it has the largest slope which means it is the steepest

it has the largest slope which means it is the steepest

what is acceleration

acceleration is a measure of how quickly velocity changes AND it includes direction

when is an object accelerating

when the object speeds up, slows down or turns

When an object speeds up or slows down how can you calculate its acceleration

a = (Speed final minus speed initial) divided by time

what is momentum a measure of

it is a measure of how hard it is to stop the object

What is momentum's formula

Momentum equals mass times velocity

What happens in a collision

momentum is transferred from one object to another

what is the law of conservation?

the total amount of momentum of a group of objects does not change UNLESS outside forces act on the objects