Maharashtra board std 7th science chaoter 7
Motion,force and work

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#motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of #displacement, #distance, #velocity, #acceleration, #speed, and time. The motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without reference to its cause is kinematics; the branch studying forces and their effect on motion is dynamics.

The original form of #Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object.
Maharashtra board std 7th science chaoter 7
Motion,force and work
Concepts related to force include: thrust, which increases the #velocity of an object; drag, which decreases the velocity of an object; and #torque, which produces changes in rotational speed of an object. In an extended body, each part usually applies forces on the adjacent parts; the distribution of such forces through the body is the internal mechanical stress. Such internal mechanical stresses cause no acceleration of that body as the forces balance one another. Pressure, the distribution of many small forces applied over an area of a body, is a simple type of stress that if unbalanced can cause the body to accelerate. Stress usually causes deformation of solid materials, or flow in fluids.

Maharashtra board std 7th science chaoter 7
Motion,force and work
work is the energy transferred to or from an object via the application of force along a displacement. In its simplest form, it is often represented as the product of force and displacement. A force is said to do positive work if (when applied) it has a component in the direction of the displacement of the point of application. A force does negative work if it has a component opposite to the direction of the displacement at the point of application of the force.

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std 7th science chapter 7 Maharashtra board std 7th science chaoter 7 Motion,force and work

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