Motion in a Straight Line: Uniform Motion and Acceleration

Questions and Answers

Increasing velocity

Decreasing acceleration

Changing direction

Constant velocity (correct)

The rate of change of time with respect to velocity

The rate of change of distance with respect to time

The rate of change of velocity with respect to distance

The rate of change of velocity with respect to time (correct)

A straight line (correct)

A curved line

A horizontal line

A sloping line

Increasing velocity Signup and view all the answers

Retardation Signup and view all the answers

A sloping line Signup and view all the answers

Force in the direction of motion Signup and view all the answers

Decrease in velocity Signup and view all the answers

Study Notes

Definition: Motion of an object in a straight line with a constant velocity (speed and direction).
Characteristics:
- Constant speed
- Constant direction
- No acceleration
- Distance-time graph is a straight line
- Velocity-time graph is a horizontal line
Examples:
- A car moving on a straight road with a constant speed
- A ball rolling on a flat surface with no friction

Definition: The rate of change of velocity with respect to time.
Characteristics:
- Increase in velocity
- Change in direction
- Force is applied in the direction of motion
- Distance-time graph is a curved line
- Velocity-time graph is a sloping line
Types of acceleration:
- Positive acceleration: increase in velocity (e.g., a car accelerating from rest)
- Negative acceleration: decrease in velocity (e.g., a car slowing down)

Definition: The rate of change of velocity in the opposite direction of motion, resulting in a decrease in velocity.
Characteristics:
- Decrease in velocity
- Force is applied in the opposite direction of motion
- Distance-time graph is a curved line
- Velocity-time graph is a sloping line with a negative slope
Examples:
- A car slowing down to stop
- A ball rolling on a rough surface, experiencing frictional force

Motion with constant velocity (speed and direction) in a straight line
Characteristics of uniform motion:
- Constant speed, no increase or decrease
- Constant direction, no change in path
- No acceleration, no change in velocity
- Distance-time graph is a straight line, indicating equal distances covered in equal time intervals
- Velocity-time graph is a horizontal line, indicating constant velocity
Examples of uniform motion:
- A car moving on a straight road with a constant speed, no acceleration or deceleration
- A ball rolling on a flat surface with no friction, maintaining constant velocity

Rate of change of velocity with respect to time, resulting in an increase in velocity
Characteristics of acceleration:
- Increase in velocity, resulting in faster motion
- Change in direction, possible with acceleration
- Force is applied in the direction of motion, causing acceleration
- Distance-time graph is a curved line, indicating unequal distances covered in equal time intervals
- Velocity-time graph is a sloping line, indicating increasing velocity
Types of acceleration:
- Positive acceleration: increase in velocity, e.g., a car accelerating from rest
- Negative acceleration: decrease in velocity, but not retardation, e.g., a car slowing down, but still moving forward

Rate of change of velocity in the opposite direction of motion, resulting in a decrease in velocity
Characteristics of retardation:
- Decrease in velocity, resulting in slower motion
- Force is applied in the opposite direction of motion, causing retardation
- Distance-time graph is a curved line, indicating unequal distances covered in equal time intervals
- Velocity-time graph is a sloping line with a negative slope, indicating decreasing velocity
Examples of retardation:
- A car slowing down to stop, experiencing a decrease in velocity
- A ball rolling on a rough surface, experiencing frictional force, resulting in a decrease in velocity