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On the macroscopic level, it can explain the heat, work, and power associated with the human body. Physics is involved in medical diagnostics, such as x-rays, magnetic resonance imaging (MRI), and ultrasonic blood flow measurements. Medical therapy sometimes directly involves physics; for example, cancer radiotherapy uses ionizing radiation.
Rotational Motion. We are going to consider the motion of a rigid body about a fixed axis of rotation. The angle of rotation is measured in radians: (rads) . s. (dimensionless) r. s . Notice that for a given angle , the ratio s/r is independent of the size of the circle.
Figure 4.4 The force exerted by a stretched spring can be used as a standard unit of force. (a) This spring has a length x when undistorted. (b) When stretched a distance Δx , the spring exerts a restoring force, Frestore , which is reproducible. (c) A spring scale is one device that uses a spring to measure force.
Motion may be divided into three basic types — translational, rotational, and oscillatory. The sections on mechanics in this book are basically arranged in that order. The fourth type of motion — random — is dealt with in another book I wrote. Motion that results in a change of location is said to be translational.
9.3: Impulse and Collisions (Part 1) When a force is applied on an object for some amount of time, the object experiences an impulse. This impulse is equal to the object’s change of momentum. Newton’s second law in terms of momentum states that the net force applied to a system equals the rate of change of the momentum that the force causes.
Examples for Rectilinear Motion. Following are the rectilinear motion examples: The use of elevators in public places is an example of rectilinear motion. Gravitational forces acting on objects resulting in free fall is an example of rectilinear motion. Kids sliding down from a slide is a rectilinear motion. The motion of planes in the sky is a ...
Law of inertia, also known as Newton’s first law of motion, states that. An object will continue to be in the state of rest or in a state of motion unless an external force acts on it. We have read about the Aristotle fallacy, as per which an external force is always required to keep a body in motion. This was proved wrong when the concept of ...
