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speed versus time
The rate at which velocity changes over time. |
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| When a hiker's velocity begins at 2.8m/s uphill and changes to 2.2 m/s uphill you know |
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| that the hiker has had a NEGATIVE ACCELERATION because his speed has decreased |
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| a line sloping upward as time passes on a graph of speed of speed versus time |
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| can cause an object's motion to change by stopping motion |
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| a push or pull acting on an object |
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| the net force of an object equals 0 N |
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| Example of a balanced force |
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| a porch swing hanging from a roof |
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| Balanced forces of an object create a net force of |
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| the combination of all forces acting on an object |
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| a object that appears to stay in place and can be used to detect the motion of another object |
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| An object's change in position relative to a reference point |
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| If velocity of an object is constant (not changing) |
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Definition
| forces acting on object are balanced |
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| change in SPEED, change in DIRECTION, or both |
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| the speed of an object in a certain direction |
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| If a bus is going 10m/hr down the street and turns a corner and continues traveling 10 m/hr in the NEW direction what changed? |
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| Total distance traveled divided by the total time elapsed |
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| A force that acts against motion between two surfaces |
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| A worker pushing on a nonmoving box is an example of |
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Definition
| being opposed by STATIC friction |
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| is opposed by KINECTIC friction |
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| the force that opposes your push when you are UNABLE to move a heavy piece of furniture across the floor |
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| Replaces static friction when an object starts MOVING |
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| A substance that can be put on surfaces to reduce the friction between the surfaces |
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| A ball is rolling down the sidewalk. It falls off the curb and drops into the grass where it stops moving. Why did the ball stop? |
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Definition
| FRICTION was increased when the ball rolled onto the grass - the speed of the ball changed. |
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