Interpreting Motion Graphs Motion A change in position
- Slides: 23
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. • Time is on the x-axis, distance (OR SPEED) is on the y-axis. • The steeper the graph, the faster the motion.
Distance-Time Graphs • Time is always on the x-axis. Distance is always on the y-axis.
Speed-Time Graphs • Time is always on the x-axis. Speed is always on the y-axis.
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.
Distant-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.
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 Speed • This graph shows time is INCREASING while speed is DECREASING at a constant rate. This graph also shows CONSTANT 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.
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 Then, the speed increases rapidly Speed Initially, the object is traveling at a slower speed • 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.
Distance-Time: DECELERATION • This graph is the same as above, but the curve downward shows DECELERATION or a DECREASE IN SPEED.
Speed-Time: DECELERATION Speed The speed rapidly declines and the object slows down Initially, the object is traveling at a very fast speed. • 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.
Putting it all together
Speed Putting it all together increasing speed at a constant rate constant speed decreasing speed at a constant rate
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