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How can you tell if an object is speeding up or slowing down from a position time graph?
If the V-T line has a positive slope, the object is undergoing acceleration in positive direction.
- If v is in positive quadrant, object is speeding up.
- If v is in negative quadrant, object is slowing down.
What causes falling objects to speed up as they fall?
When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
How can you determine graphically whether an object is speeding up?
Speed-time graphs
- The steeper the slope of the line the greater the acceleration.
- If the line slopes upward from left to right, this means the object is speeding up. Its acceleration will be positive.
- If the line slopes downward from left to right on the graph, this means that the object is slowing down.
What kind of acceleration occurs when an object speeds up?
When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration. In Example B, the object is moving in the negative direction (i.e., has a negative velocity) and is slowing down.
How do you find the speed of an object before it hits the ground?
Calculate the final free fall speed (just before hitting the ground) with the formula v = v₀ + gt = 0 + 9.80665 * 8 = 78.45 m/s . Find the free fall distance using the equation s = (1/2)gt² = 0.5 * 9.80665 * 8² = 313.8 m .
How do you describe a speed-time graph?
The area under a speed-time graph represents the distance travelled. A horizontal line on a speed-time graph represents a constant speed. A sloping line on a speed-time graph represents an acceleration. The sloping line shows that the speed of the object is changing.
How do you describe a velocity time graph?
A velocity-time graph shows the changing velocity of the sprinter or of any other moving person or object. In a velocity-time graph, acceleration is represented by the slope of the graph line. If the line slopes downward, like the line between 7 and 10 seconds, velocity is decreasing and acceleration is negative.