motion class 9 Flashcards
(26 cards)
What is motion?
Motion is the change in position of an object with respect to time.
True or False: An object is in motion if its position changes with respect to a stationary observer.
True
What is the formula for calculating speed?
Speed = Distance / Time
Fill in the blank: The SI unit of speed is __________.
meters per second (m/s)
What do we call the rate of change of velocity?
Acceleration
True or False: Velocity is a scalar quantity.
False
What is the difference between speed and velocity?
Speed is a scalar quantity, while velocity is a vector quantity that includes direction.
Define distance.
Distance is the total path length traveled by an object, regardless of direction.
Define displacement.
Displacement is the shortest distance from the initial to the final position of an object, along with the direction.
What is uniform motion?
Uniform motion occurs when an object covers equal distances in equal intervals of time.
What is non-uniform motion?
Non-uniform motion occurs when an object covers unequal distances in equal intervals of time.
Fill in the blank: The acceleration due to gravity on Earth is approximately __________.
9.8 m/s²
What is the graphical representation of motion called?
Distance-time graph
True or False: A horizontal line on a distance-time graph indicates that the object is at rest.
True
What does a steeper slope on a distance-time graph indicate?
A steeper slope indicates a higher speed.
What is a velocity-time graph?
A velocity-time graph shows how velocity changes with time.
What does the area under a velocity-time graph represent?
The area under a velocity-time graph represents the distance traveled.
What is the formula for acceleration?
Acceleration = (Final velocity - Initial velocity) / Time
Fill in the blank: In free fall, the only force acting on an object is __________.
gravity
What is the effect of air resistance on falling objects?
Air resistance opposes the motion of falling objects and can reduce their acceleration.
True or False: A body can be in motion with respect to one observer and at rest with respect to another.
True
What is the term for the change in position of an object in a given time?
Displacement
What is instantaneous speed?
Instantaneous speed is the speed of an object at a specific moment in time.
What is the difference between scalar and vector quantities?
Scalar quantities have only magnitude, while vector quantities have both magnitude and direction.
