Study Mode
Motion Review
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• Draw a graph for a person who walks up a hill at a constant speed, across the top, and down the other side.
See Graph on Board
• When does an object's velocity change?
speed up, slow down, change direction
• • Describe the motion of the object using the graph.
accelerating quickly, constant speed, slow acceleration, slow deceleration
• How do you calculate distance?
Add up all of the lengths to get a total distance.
• What is positive acceleration?
speeding up
• How quickly an object is moving at a certain time is its...
instantaneous speed
• What does negative slope represent on a distance vs time graph?
going back to start
• • Describe the acceleration of the object using each section of the graph
positive, zero, positive, negative
• • Explain the motion of the object in the graph.
slow constant speed away from start, stopped, slow constant speed away from start, fast constant speed home
• What does a horizontal line above the x axis represent on a speed vs time graph represent?
constant speed
• • Calculate the speed of the object during the third section of movement
S=? D=30m T=3s S=D/T S=30m/3s S=10m/s
• What does a diagonal, straight line represent on a distance vs time graph?
constant speed
• How can you tell an object has moved?
The object's position changes compared to a reference frame.
• What is displacement?
An object's ending position compared to its starting point.
• What is the unit for speed?
m/s
• What does negative slope represent on a speed vs time graph?
slowing down
• Explain why a car turning a corner at a constant speed of 20 m/s is not traveling at a constant velocity.
Because the direction of the car is changing, velocity is not constant (vector).
• What does a horizontal line on the x axis on a speed vs time graph represent?
motionless
• Explain why rate and speed are considered the same thing.
Both divide distance by time.
• Explain the difference between speed and acceleration.
Speed only considers the distance and object moves in a given time, which acceleration includes how quickly the speed is changing in a given time with direction
• What is the unit for distance?
m (km)
• What does a curved line represent on a distance vs time graph?
non-constant speed (acceleration)
• What is the unit for rate?
m/s
• Define distance.
Total length of an object's path.
• What does a horizontal line on a distance vs time graph represent?
motionless
• What is negative acceleration?
slowing down
• Define scalar.
A quantity that includes only magnitude (size).
• Which term(s) is(are) scalar: distance, displacement, speed, rate, velocity, acceleration
distance, speed, rate
• What does a straight, diagonal line represent on a speed vs time graph?
constant acceleration
• Define vector.
A quantity that includes both magnitude (size) and direction.
• How do you calculate average speed?
total distance divided by total time
• What does "delta v" represent?
change in velocity (final velocity minus initial velocity)
• What is the unit for acceleration?
m/s/s
• What is the unit for velocity?
m/s + direction