Forces & Motion Review. Describe Acceleration A change in velocity – which may be: –A change in speed Starting Stopping Speeding up Slowing down –A change.

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Presentation transcript:

Forces & Motion Review

Describe Acceleration A change in velocity – which may be: –A change in speed Starting Stopping Speeding up Slowing down –A change in direction Acceleration is caused by unbalanced forces More

Describe Acceleration Deceleration is also called negative acceleration - it means an object is slowing down When acceleration is calculated, it may be a negative number Units = m/s 2

Describe Speed A way to describe motion –Average speed - Rate of motion calculated by dividing the distance traveled by the amount of time it takes to travel that distance –Constant speed - Speed that does not change –Instantaneous speed - Speed of an object at any given time

What is the formula for calculating speed? Speed is calculated by dividing distance by time –

Calculate This Speed A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast was the football player running?

Calculate this Speed: A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast was the football player running? Speed = Distance ÷ Time Speed = 100 m ÷ 20 s Speed = 5m/s Remember to include the UNITS!!

Distinguish Between Speed and Velocity Speed describes distance and time Velocity describes distance, time, and direction

Explain Balanced Forces When all the forces acting on an object balance each other Balanced forces do not cause a change in motion

Interpret The Graph Below:

The graph shows an object which is not moving (at rest). The distance stays the same as time goes by because it is not moving.

Interpret The Graph Below:

The graph shows that the objects distance increases as time passes. The object is moving and so it has velocity. The straight line shows it is a constant (not changing).

Interpret The Graph Below:

Just like the previous graph, this graph shows an object moving with constant velocity

Interpret The Graph Below:

The curve in the graph shows that the objects velocity is changing as time passes. This is acceleration.

Interpret The Graph Below:

In the first part of the graph the object is moving with constant velocity. In the second part of the graph the object is at rest (not moving). In the third part the object is again moving with constant velocity.

Click here for more review: ence/sciber00/8th/forces/sciber/int ro.htm