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Newton's Laws: Forces and Motion A force is a push or a pull. A force is a vector : it has a magnitude and a direction. Forces add like vectors, not like scalars. Example: Two forces, labeled F 1 and F 2, are both acting on the same object. The forces have the same magnitude F F F 12 oand are 90 apart in direction: F F F F F
He accidentally runs over an innocent moose crossing the road, so he slows to a stop to check on the poor moose. He pauses for a while until he determines the moose is squashed flat and deader than a doornail. Fleeing the scene of the crime, Schmedrick takes off again in the same direction, speeding up quickly.
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Motion Diagrams Help visualize motion. Provide a tool for finding acceleration vectors. Dots show positions at equal time Velocity vectors go dot to dot. The acceleration vector points in the direction or AT'. These are the average velocity and the average acceleration vectors.
1= 60:0 N, and T. 2= 79:8 N. Lecture 7: Newton’s Laws and Their Applications 6. Accelerated Motion F = ma A extremely common example of the accelerated motion type of problem is given in Ex. 4.3 (page 123). A sled of mass mis placed on a frictionless hill (inclined plane) which is at an angle with the horizontal.
coefficient or rolling friction μ. , defined as the ratio of the force needed for constant speed to the normal force exerted by the surface over which the rolling motion takes place, is significantly lower than the coefficient of kinetic friction μ. Typical values for μ range from 10−3 to 10−2.
Kinetic Energy: The energy an object has due to its motion. It is the amount o f energy that would be transferred from the object when it decelerates to rest. Power: The work done or energy transferred by a system divided by the time taken for that to be done. Work Done: The energy transferred when a force moves an object over a distance.
1. One of the most important examples of periodic motion is simple harmonic motion (SHM), in which some physical quantity varies sinusoidally. Suppose a function of time has the form of a sine wave function, y(t) = Asin(2πt / T ) (23.1.1) where A > 0 is the amplitude (maximum value).
