9 Questions
What is a characteristic of uniform motion?
Velocity remains constant
Which type of motion is characterized by a curved line on a distance-time graph?
Non-uniform motion
What does the slope of a speed-time graph represent?
Acceleration of the object
What is the unit of acceleration?
Meter per second squared (m/s²)
An object is moving with a constant speed but changing direction. What type of motion is this?
Non-uniform motion
A car accelerates from rest to a speed of 20 m/s in 4 seconds. What is its acceleration?
5 m/s²
What is the definition of acceleration?
Rate of change of velocity
A ball is thrown upwards. What type of motion does it undergo?
Non-uniform motion
What does a horizontal line on a speed-time graph indicate?
Uniform motion
Study Notes
Motion
Uniform Motion
- Defined as motion with a constant speed in a straight line
- Velocity (speed and direction) remains constant
- Distance-travelled is proportional to time
- Examples: a car moving at a constant speed on a straight road, a ball rolling on a horizontal surface
Non-uniform Motion
- Defined as motion with a changing speed or direction
- Velocity (speed and direction) changes over time
- Distance-travelled is not proportional to time
- Examples: a car accelerating or decelerating, a ball thrown upwards
Distance-time Graph
- A graph that shows the relationship between distance travelled and time
- Slope of the graph represents the speed of the object
- A straight line on the graph indicates uniform motion
- A curved line on the graph indicates non-uniform motion
Speed-time Graph
- A graph that shows the relationship between speed and time
- Slope of the graph represents the acceleration of the object
- A horizontal line on the graph indicates uniform motion (constant speed)
- A curved or sloping line on the graph indicates non-uniform motion (changing speed)
Acceleration
- Defined as the rate of change of velocity
- Measured in units of meters per second squared (m/s²)
- Can be positive (accelerating) or negative (decelerating)
- Calculated using the formula: acceleration = change in velocity / time
- Examples: a car accelerating from rest, a ball falling under gravity
Motion
Uniform Motion
- Motion with a constant speed in a straight line, resulting in a constant velocity
- Distance-travelled is directly proportional to time, with no change in direction
- Examples include a car moving at a constant speed on a straight road, and a ball rolling on a horizontal surface
Non-uniform Motion
- Motion with a changing speed or direction, resulting in a changing velocity
- Distance-travelled is not directly proportional to time, with possible changes in direction
- Examples include a car accelerating or decelerating, and a ball thrown upwards
Graphs
Distance-time Graph
- A graph that shows the relationship between distance travelled and time
- The slope of the graph represents the speed of the object
- A straight line on the graph indicates uniform motion, while a curved line indicates non-uniform motion
Speed-time Graph
- A graph that shows the relationship between speed and time
- The slope of the graph represents the acceleration of the object
- A horizontal line on the graph indicates uniform motion (constant speed), while a curved or sloping line indicates non-uniform motion (changing speed)
Acceleration
- The rate of change of velocity, measured in meters per second squared (m/s²)
- Can be positive (accelerating) or negative (decelerating)
- Calculated using the formula: acceleration = change in velocity / time
- Examples include a car accelerating from rest, and a ball falling under gravity
Understand the concept of uniform and non-uniform motion, including definitions, characteristics, and examples of each type of motion.
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