Interactions and Forces
        When does a force stop pushing on an object?      
      Can you describe the scenario that made this graph?
Look at the segments of speeding up.
Scientists Ideas
    If the Net Force on the cart is zero
there is no 'speeding up'
or 'slowing down'

the cart will
remain at rest
or, if moving
remain in constant motion

Free-Body Diagram of Circular Motion


The car accelerates at a constant

10 mph

per second

Adding up Forces and determining Speed