Dynamics

Dynamics A force is a push or a pull. (Vector Quantity) Newton’s first law of motion states that an object at rest will REMAIN AT REST and an object in motion will continue in motion at CONSTANT SPEED in a straight line in the absence of a resultant force acting on it(Balanced force). Balanced force = Body in equilibrium = No resultant force -Balanced force doesn’t mean that there is no force acting on it but the forces are balanced. Unbalanced force = Body is not in equilibrium = Resultant force A resultant force causes an object at rest to move. A resultant force cause an object that is moving to stop, to move faster, to move slower and to change direction. Newton’s second law of motion states that the resultant force acting upon an object is equal to the product of the mass (KG) and the acceleration of the object (m/ s^2); the direction of the force is the same as that of the object’s acceleration. Force (N) = Mass (KG) x Acceleration (M/s^2) =mxa Constant Velocity = No acceleration = No resultant force Newton’s third law of motion states that for every action there is an equal and opposite reaction. A free-body diagram shows the forces that act on a single body. Friction is a force that opposes motion between two surfaces in contact. Friction does not depend on the area of contact of the surfaces but depends on the nature of the contact surfaces and the weight of the body.