Motion
What is an object in motion?
An object is in motion when it’s distance from another object is changing.
When can you calculate velocity?
When you know the distance an object travels in a certain amount of time.
What is acceleration?
The rate at which velocity changes.
True or false
An object can not be accelerating if it has a constant speed?
False
Reference Point
What is the formula used to calculate speed??
Speed = distance/time
What does acceleration involve?
A change in either direction or speed.
How many meters are in a kilometer?
1,000 meters
Why do scientists use SI units?
To describe the distance an object moves.
What is the formula speed=distance/time used to measure?
Average speed
How do you calculate acceleration?
Final velocity - initial velocity divided by time.
How can you calculate the slope of a line?
Slope = rise/run
What is the basic SI unit?
A meter
What is velocity?
Speed in a given direction
**you have to know both speed and direction.
True or false
A train is slowing down, is it accelerating?
True
What graphs are used to analyze the motion of an accelerating object?
Speed vs. time graph and distance vs. time graph
Speed measurements are given in units of?
Distance/time
What do sloped lines and horizontal lines mean on a graph?
Sloped= depends on the speed of the object.
Horizontal = not moving at all.
A car is traveling 35m/s speeds up to 50 m/s over a period of 15 seconds. What is the car’s average acceleration?
1m/s2
A car travels 80 kilometers in the first two hours and 20 kilometers the next two hours. What is the car’s average speed?
25 kilo/hr