# mcat math kinetics and dynamics

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } force pushing or pulling on objects the forces can exist between those not touching gravity attractive force that is felt by all forms of matter all objects exert gravitational forces on each other two types of force gravityfriction friction force type of force that opposes the movement of objectsit may cause an object to go slow or stationary 2 types of friction statickinetic static friction between a stationary object and the surface upon which it reststhe coefficient is dependent on 2 materials normal force component of the force between two objects in contact that is perp to the plane of contact between the object and surface upon which it rests kinetic friction exists between a sliding object and the surface over which the object slidesanytime two objects slide across each other, kinetic friction will be present 2 differences between static and kinetic friction equations KF has an equal sign meaning it will have a constant value given any combo of KF and NFtwo equations have a diff coefficient, Us is bigger than Uk, so SF will be greater and will stick before they move mass measure of the body's inertia (amount of matter in an object) Newton's 3 Laws a body at rest or in motion at a constant velocity will continue until a force acts upon it (law of inertia)no acceleration will occur when the sum of the forces results in the cancellation of those forces linear motion objects velocity and accel are along the line of motion air resistance opposes the motion of the object, so an object falling will experience drag force as the velocity increases the drag force will=the mag to the weight of the object and will fall with constant velocity (terminal velocity) uniform circular motion instant velocity vector is always tangent to the circular path, meaning, the object tends to break out of its pathway and move in a linear direction but is kept from doing this due to centripetal force. once CF is no longer acting on the object, the object will exit the pathway and assume a tangible path from the circle force and acceleration are vectors and accel is always the same direction as the net force dynamics study of forces and torque translational equilibrium (first condition of equilibrium) exists when only the vector sum of all of the forces acting on an object is zero if no accel, there is no net force, but just because the force is 0 does not mean the velocity is rotational motion forces are applied against an object i such a way as to cause the object to rotate around a fixed pivot point (fulcrum)is generated by torque not force itself moment of force appliced force at some distance from the fulcrum that generates torque rotational equilibrium (second condition of equilibrium) vector of sum of all torques acting on an object is 0 the mcat takes rotational equil to mean the object is not rotating at all KE objects that have mass move with some speed faster they move, the more KE they haveit is relation to speed not velocity, so PE energy associated with a given objects position in space or other qualities of the system gravitational potential energy depends on the objects in space with respect to some level known as ground the first law of thermodynamics energy is neither created not destroyed total mechanical energy accounts for potential and kinetic only unless friction force is present, the energy can be given off in heat and dissapate from a systemif no nonconservative forces are present, thats when KE and PE are constant conservative forces those that are path independent and that do not dissipate energy work energy theorem expression of the relationship between work an Eand can be applied to changes in other forms of E simple machines provide a mechanical advantagewheel/axle,pulley,wedge,and screw in mechanical advantage displacement is pathway independent, the actual distance traveled from initial to final doesnt matter if one assumes all forces are conservative. so less force over a great distance to accomplish same change, accomplishes the same amount of work mechanical advantages of an inclined plane reduction of necessary force at the cost of increased distance to achieve a given value of work or energy transference pulleys allow heavy objects to be lifted without much force theoretically pulley is massless and frictionless under theoretical conditions, the work put into a system comes out of the system considering simple machines, load and effort are both forces to consider to determine output force and input force .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Authorpremedkid ID315249 Card Setmcat math kinetics and dynamics Descriptionmcat kinetic and dynamics math Updated2016-02-05T00:26:02Z Show Answers