1D motion

• Kinematics describes motion in terms of displacement, velocity, and acceleration.
• Dynamics describes motion in terms of force and motion.
• The study of motion is divided into kinematics and dynamics.
• Motion represents a continual change in an object’s position.
• Translation is the term used in physics for motion in a straight line.
• Translation is commonly described by three quantities: displacement, velocity, and acceleration.
• Position, velocity, and acceleration directed to the right of the origin are considered positive, while those that are directed to the left of the origin are considered negative.
• The object’s position is its location with respect to a chosen reference point.
• Displacement is defined as the change in position during some time interval.
• Displacement refers to the straight-line distance between an object’s initial and final positions with direction toward the final position.
• Displacement can be positive or negative.
• Displacement is measured in SI units as meters (m).
• Displacement is a vector quantity (both magnitude and direction).
• Distance refers to the total length of path taken by an object in moving from its initial to final positions.
• Distance is a scalar quantity (described by magnitude only).
• Acceleration is the rate of change of velocity and its SI units are m/s².
• Uniform accelerated motion occurs when an object speeds up or slows down at the same rate throughout the duration of its motion.
• “+” acceleration means you will speed up.
• The most common type of uniform accelerated motion is gravity, which pulls all masses toward the Earth at a constant acceleration of -9.8 m/s².
• When an object’s velocity and acceleration are in the same direction, the object is speeding up.
• Acceleration is a vector and will have a magnitude and a direction.
• “-” acceleration means you will slow down.
• The kinematic equations may be used to solve any problem involving one-dimensional motion with a uniform accelerated motion or constant acceleration.
• When an object’s velocity and acceleration are in the opposite direction, the object is slowing down.
• If the starting point is different from the ending point, there was displacement.
• If it is the same, then there is no displacement.
• Speed is distance traveled by a body in a given time, represented by the formula s = 𝒅𝒕, and is a scalar quantity with the SI Unit being meter per second (m/s).
• Velocity is the time rate of change of position, represented by the formula 𝒙𝒕 = 𝒙𝐟 − 𝒙𝐢𝒕𝐟 − 𝒕𝐢, and is a vector quantity with the SI Unit being meter per second (m/s).
• Instantaneous velocity is the velocity at a specific instant of time.
• Average velocity is the displacement of an object (Δx) divided by the total time elapsed (Δt).
• Average speed is the total distance traveled divided by the total time elapsed.
• Instantaneous speed is the speed at a particular moment in time.