Interpreting Motion Graphs

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Presentation transcript:

Interpreting Motion Graphs

Motion A change in position measured by distance and time.

Speed The rate at which an object moves.

Velocity The speed and direction of a moving object.

Acceleration The rate, speed, or direction changes.

Reference Point A place or object used for comparison to determine if something is in motion. So…a fly is sitting on the shoulder of a man sitting in a car. The car is traveling at 60 mph. Is the fly in motion?

Key Points A straight line shows constant speed. A curved line shows average speed. A horizontal line shows no motion on a distance- time graph, and constant, steady speed on a speed-time graph. Time is on the x-axis, distance (OR SPEED) is on the y-axis. The steeper the graph, the faster the motion.

Time is always on the x-axis. Distance is always on the y-axis. Distance-Time Graphs Time is always on the x-axis. Distance is always on the y-axis.

Time is always on the x-axis. Speed is always on the y-axis. Speed-Time Graphs Time is always on the x-axis. Speed is always on the y-axis. Speed

Distance-Time: NO MOTION Time is increasing, but distance does NOT change. It is NOT MOVING…NO MOTION…AT REST.

Speed-Time: CONSTANT SPEED Time is increasing, but speed does NOT change. It is moving at a constant speed. **Like cruise control** Speed

Distance-Time: CONSTANT SPEED Time and distance are INCREASING at a constant rate. This graph shows CONSTANT SPEED.

Speed-Time: CONSTANT SPEED Time and speed are INCREASING at a constant rate. This graph shows CONSTANT SPEED. Speed

Distance-Time: CONSTANT SPEED This graph shows a change in direction (meaning the object is headed back to the starting point). This graph also shows CONSTANT SPEED.

Speed-Time: CONSTANT SPEED This graph shows time is INCREASING while speed is DECREASING at a constant rate. This graph also shows CONSTANT SPEED. Speed

Distance-Time: FASTER SPEED A steeper line shows greater distance traveled in a given time. The STEEPER THE LINE, the HIGHER THE SPEED.

Speed-Time: FASTER SPEED A steeper line shows speed increasing in shorter amount of time. The STEEPER THE LINE, the HIGHER THE SPEED. Speed

Distance-Time: ACCELERATION In a given time, the distance the object moves is getting larger, it is ACCELERATING. The curve upward shows an INCREASE in SPEED.

Speed-Time: ACCELERATION In a given time, the speed at which the object is travelling is increasing, it is ACCELERATING. The curve upward shows an INCREASE in SPEED. Then, the speed increases rapidly Initially, the object is traveling at a slower speed Speed

Distance-Time: DECELERATION This graph is the same as above, but the curve downward shows DECELERATION or a DECREASE IN SPEED.

Speed-Time: DECELERATION In a given time, the speed at which the object is travelling is decreasing, it is DECELERATING. The curve downward shows a DECREASE IN SPEED. The speed rapidly declines and the object slows down Speed Initially, the object is traveling at a very fast speed.

Putting it all together

Putting it all together Speed increasing speed at a constant rate constant speed decreasing speed at a constant rate