PHYSICS

• Translational motion is the motion in which all points of a moving body move uniformly in the same line or direction.
• Translational motion can be two types: Rectilinear motion, which is the motion when the body is moving in a straight line, and Curvilinear motion, which is the motion when the body is in a curved path.
• Rotary motion, also known as circular motion and rotational motion, is the motion that involves movement in a circle about a fixed point, which is called the axis of rotation.
• Periodic motion refers to any movement of an object that is repeated in a given length of time.
• The time period of the motion is the period of time it takes to get back to where it started.
• A frame of reference or reference point is an arbitrary set of axes from which the position and motion of an object are described. point that we can consider to be the origin of a coordinate system
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  Distance vs. Displacement

  is the length of a path followed by a particle (scalar quantity)is defined as the particle’s change in position in some time interval (vector quantity)

  • denoted as the change in position as ∆𝑥 (delta x – read as change of x)
• • Speed is a scalar quantity which means it has no direction.It denotes how fast an object is moving.If the speed of the particle is high it means the particle is moving fast and if it is low, it means the particle is moving slow.
• • Velocity is a vector quantity which means it has both magnitude and direction.It denotes the rate at which the object is moving or changing position.The direction of the velocity is same as the direction of the moving object.Even if the object is slowing down, and the magnitude of velocity is decreasing, its direction would still be same as the direction in which the object is moving
• The average speed of a body in a certain time interval is the distance covered by the body in that time interval divided by time.
• the average velocity of a particle during a time interval can’t tell us how fast, or in what direction, the particle was moving at any given time during the interval.

  To do this we need to know the instantaneous velocity, or the velocity at a specific instant of time or specific point along the path.
• Just as velocity describes the rate of change of position with time, acceleration describes the rate of change of velocity with time.
• Acceleration is a vector, so we must choose the appropriate sign for it in our chosen coordinate system.
• The simplest kind of accelerated motion is straight-line motion with constant acceleration.
• The motion of an object can be represented by a position-time graph. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time.
• A position-time graph shows how far an object has traveled from its starting position at any given time since it started moving.