What is acceleration?
The rate of change of velocity with respect to time. It is a vector quantity, meaning it has both magnitude and direction. The SI unit is metres per second squared (ms−2).
What is accelerated motion?
Any motion where the velocity of an object is changing. This can mean a change in speed, a change in direction, or both.
What is deceleration?
An acceleration that is in the opposite direction of the velocity, causing a decrease in speed.
What is average acceleration?
The total change in velocity divided by the time taken for that change.
What is uniformly accelerated motion?
Motion in which the velocity changes by an equal amount in equal time intervals.
What is speed?
The rate of change of distance with respect to time. It is a scalar quantity, only having magnitude. The SI unit is metres per second (ms−1).
What is velocity?
The rate of change of displacement with respect to time. It is a vector quantity, with both magnitude and direction. The SI unit is metres per second (ms−1).
What is initial velocity (u)?
The velocity of an object at the beginning of a time interval.
What is final velocity (v)?
The velocity of an object at the end of a time interval.
What is constant velocity?
An object moving in a straight line at a constant speed. Its acceleration is zero.
What is displacement?
The distance and direction of an object from a starting point. It is a vector quantity. The SI unit is the metre (m).
What is a straight line in motion?
A path of motion that does not change direction.
What is skid-to-stop distance?
The distance a vehicle travels from the moment the brakes are applied until it comes to a complete stop.
What are skid marks?
Marks left on a road by a tire that is skidding, indicating the path and distance of the skid.
What is a vector quantity?
A physical quantity that has both magnitude and direction.
What are perpendicular components?
The two parts of a vector that are at a 90-degree angle to each other, often used to analyze motion in two dimensions.
What is projectile motion?
The motion of an object thrown or projected into the air, subject to the force of gravity alone. The path of a projectile is a parabola.
What is gravity?
The force of attraction between all masses. On Earth, this results in objects being pulled towards the planet’s center.
What is the acceleration of free fall (g)?
The acceleration experienced by an object due to gravity in the absence of air resistance. Near the Earth’s surface, its value is approximately 9.81 ms−2.
What is an SI unit?
The internationally agreed-upon standard unit of measurement for a physical quantity.
What are the equations of motion?
A set of four equations that describe the motion of an object under uniform acceleration.
What is kinematics?
The branch of mechanics that deals with the study of motion without considering the forces that cause the motion.
What is force?
A push or pull upon an object resulting from its interaction with another object.
What is weight?
The force of gravity acting on an object, calculated as mass times the acceleration of free fall (W = mg).
