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The speed you read on a speedometer is… A. Instantaneous speed B. Constant speed C. Average speed D. Velocity
A. Instantaneous speed
On a distance/time line graph, what will the line do when a person returns to their starting position?
The line will take a downwards slope
3 m/s north is an example of a(n)… A. speed B. time C. velocity D. acceleration
C. Velocity Velocity has directions (North, South, East, West)
When the lines (A and C) are moving in a straight line upward in a distance vs. time graph, but C looks steeper, that means..
A is slower than C
A car moves around a wide turn, going 45 mi/hr the whole time. The car has a constant A. speed B. direction C. velocity D. acceleration
A. Speed It’s not Velocity because Velocity is a vector that includes both speed and direction, so a change in direction means the velocity is not constant. Because the velocity is changing, the car is undergoing acceleration, even though its speed is constant.
Motion is a change in… A. Time B. Velocity C. Speed D. Position
D. Position
An indicator that orients you when describing motion is called the A. time B. reference point C. speed D. point of motion
B. Reference point When describing an object’s motion, we compare its position to this reference point.
An indicator that orients you when describing motion is called the A. time B. reference point C. speed D. point of motion
B. Reference point When describing an object’s motion, we compare its position to this reference point.
What does the slope of a distance vs. time graph
Speed
A horizontal (flat) line on a velocity vs. time graph shows ____ acceleration
Zero acceleration because it is velocity
Describe the motion of a distance vs. time graph that goes up in a straight slant
Constant speed; The speed is constant
Describe the motion of a distance vs. time graph that goes up in a curved slant
Accelerating
What is the variable on the Y-Axis on this graph V | E | L | O| C | I | T | Y |___ ___ ___ ___ T I M E
Velocity Think of (x,y)
In this velocity vs. time graph, the person at point C is doing what? C is going down in a slanted straight line
Slowing down (Negative Acceleration)
At what point is the rate of change of VELOCITY the greatest? A is in a slant going upwards but almost in a fully upwards straight line B is flat C is moving downwards in a straight slant, slightly less steep than A / __ __ \ A. / B. C. \
A
What does the slope of this graph tell you? It’s a distance vs. time graph. The line goes up in a curve
Speed
On a speed vs. time graph, which line segment shows a constant velocity and no acceleration? A. / B. __ C. / D. \
B
On a speed vs. time graph, which line segment shows positive acceleration? A. / B. __ C. / D. \
A or C; both
What is true about a car with constant velocity? A. it has a positive acceleration B. it has a negative acceleration C. it has zero acceleration D. it has a changing direction
C. It has zero acceleration
The velocity of an object must include both a ___________ and a _________
Speed and direction Ex. 40 km / hr north
On a distance vs. time graph, describe the motion of point B B. ____ flat line
Stopped or no motion
• A car slowing down as it is approaching a red traffic light has a ________acceleration • When the light turns green, the car’s acceleration is ______
1.Negative • Positive
Change in an object’s position
Motion
What are the 3 specific ways an object can accelerate?
• Speed up • Slow down • Change direction