Whenever a velocity changes, we say that an acceleration is taking place. This includes the cases that the object is speeding up, slowing down, or changing the direction of its motion.

Main pages in this section	Estimated time required
Soup Delivery	30 minutes
Rolling Down Hill, Again!	30 minutes
Science content: More about acceleration	30 minutes
Discussion of the second unit on Acceleration	30 minutes

Materials needed for this section

• Force scale*
• board with hook *
• track section *
• steel ball *
• measuring tape *
• stop watch *
• arrow markers *
• circular bubble level *

Supplementary material:

Why study acceleration?
Next section:Force and motion