• Observe, describe, and compare the motion of objects using speed.

• Describe and calculate acceleration using change in the speed over time.

WARM-UPWARM-UP

Student Objective

• What does a straight steep line pointing up mean on a speed graph?

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http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/forces/changingspeedact.shtml

BBC Bitesize

http://www.pbslearningmedia.org/resource/phy03.sci.phys.mfw.accel/virtual-car-velocity-and-acceleration/

A

B

C

D

Look at the graph below:•Which line shows an object that is moving”? _____•Which line shows a fast, steady speed? ______•Which line shows no movement? ______•Which line shows a slow, but steady speed? _________

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Which line shows a constant speed? _____Which lines show acceleration? ______and _____Which lines shows deceleration? ______

A DB

CSPEED

Interpreting Acceleration Graphs• The steeper the line, the greater the acceleration. • A horizontal line means the object is moving at a steady speed. • A downward sloping line means the object is slowing down or “decelerating”.

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Practice Worksheet

• Interpreting Speed & Acceleration worksheet• Match the Graphhttp://www.physicsclassroom.com/Physics-

Interactives/1-D-Kinematics/Graphs-and-Ramps/Graphs-and-Ramps-Interactive

Science of football…https://www.nbclearn.com/nfl/cuecard/50770