11.3 Physical Science Reg. Notes

***know how to calculate acceleration for the test***

...

A sports car can accelerate from 0 m/s to 28 m/s in four seconds. What is the acceleration of the car?

7 m/s^2

Objects falling near Earth's surface accelerate downward at a rate of _._ m/s^2.

9.8

________ acceleration is represented on a speed-time graph by a straight line.

Constant

________ ____________ is a steady change in velocity.

Constant acceleration

____________ is an acceleration that slows an object's speed.

Deceleration

____ ____ is the movement of an object toward Earth solely because of gravity.

Free fall

What is instantaneous acceleration?

Instantaneous acceleration is how fast you are going at that instant.

Which of the following is an example of negative acceleration?

Mike pedals up a hill and gradually slows from 20 km/h to 5 km/h.

How are changes in velocity described?

The rate at which velocity changes is called acceleration.

Acceleration formula

change in velocity/total time = (vf-vi)/t

The change in the stone's speed is 9.8 m/s^2, the acceleration is due to _______.

gravity

The acceleration at a specific point on a distance-time graph is the...

instantaneous acceleration

If the velocity decreases, the acceleration is ________.

negative

If the velocity increases, the acceleration is ________.

positive

Sometimes motion is characterized by changes in both _____ and _________ at the same time.

speed, direction

What is acceleration?

the rate at which velocity changes

In science, acceleration applies to any change in an object's ________.

velocity

True/False - If an object experiences a steady velocity change in a straight line, it is undergoing constant acceleration.

True

How can you calculate acceleration?

You calculate acceleration for straight-line motion by dividing the change in velocity by the total time.