Chapter 7 gravitation View more presentations from ecphysics...
Tuesday, 20 March 2012
Sunday, 18 March 2012
Gravitation
Newton ‘s law of gravitation states that the force of attraction between particles is directly proportional to their mass and inversely proportional to the square of distance apart.
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Frictional Forces
Friction is the force opposing the motion of one body sliding or rolling over the surface of second object. Several aspects of friction are important at low velocities:
The direction of the force of friction is opposite the direction of motion.
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Equilibrium of a Rigid Body
The Moment of a Force
The moment M (turning effect) of a force about a point O is the product of the magnitude of the force (F) and the perp. distance (x)to the point of application.By convention, anti-clockwise moments are positive.
The Principle of Moments
For a rigid body acted upon by a system...
Equilibrium of Particles
Equilibrium equations for a particle: A particle is in equilibrium if the resultant of ALL forces acting on the particle is equal to zero
Equilibrium equations in component form: In a rectangular coordinate system the equilibrium equations can be represented by three scalar equations:
Triangle...
