Chapter 1 Motion

What is the formula used to calculate acceleration?

(Final Velocity - Initial Velocity) divided by time

A cyclist's speed changes from 0m/s to 15m/s in 10 secs. What is the avg acceleration of the cyclist?

1.5m/s

How is acceleration calculated?

Acceleration = (Final speed - Initial speed) / Time. You have to calculate the change in speed per unit of time.

What is an object in motion?

An object is in motion if it changes position relative to a reference point.

What graphs can be used to analyze the motion of an accelerating object?

Both speed-versus-time graphs and distance-versus-time graphs can be used to analyze the acceleration of an object.

Where is time located on a graph?

Bottom

How does the theory of plate tectonics explain the movement of Earth's landmasses?

Earth's landmasses have changed position over time because they're apart of plates that are slowly moving.

Theory of plate tectonics

Earth's plated move slowly in various directions. (some push: toward, apart, or slide past each other.)

What kind of motion does acceleration refer to?

It refers to increasing speed, decreasing speed, or changing direction.

What do you know about motion of an object that has an avg. speed of 1 m/s?

The object has traveled an avg of 1m each second over a period of time, although its speed may have varied or the object may have even stopped during that time.

How can you graph motion?

You can show the motion of an object on a line graph in which you plot distance versus time.

Why is it important to know if your reference pt is moving?

You'll find it difficult to determine which direction you are moving or even moving at all.

meter

a measure that is a little longer than a yard.

referance point

a place or object used for comparison to determine if something is in motion.

What theory explains the movement of Earth's plates?

Theory of plate techtonics

motion

its distance from another object.

What types of graphs is best used to analyze acceleration of an object?

Use a speed-versus-time graph.

velocity

speed in a given direction.

International System of Units

system of measurments that scientists all over the world use.

speed

the distance the object travels per unit of time.

instantaneous speed

the rate at which an object is moving at a given instant time.

acceleration

the rate at which velocity changes.

slope

the steepness of a line on a graph.

average speed

the total distance travled by the total time.

Plate

Over a dozen pieces of Earth's rocky, outer layer.

How do you know if an object is moving?

If it changes its position relative to a stationary stationary point.

How do you know an objects speed and velocity?

If you know the distance the object travels in a certain amount of time, and at what rate it is traveling, you can calculate the speed and velocity of the object.

2. How fast does Earth's plates move?

Some plates move at a rate of several centimeters each year. Others move only a few millimeters per year.

Difference between speed and volocity?

Speed describes the rate at which something moves. Velocity is speed in a given direction.

What are three ways an object can accelerate?

Speeding up, Slowing down, or changing direction.