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Choose two forces and compare and contrast these forces. You must provide two ways that they are alike and two ways that they are different. You may make a list, write in paragraph form, or make a chart.

Centripetal force and Centrifugal force.

» similarities

• Both these forces act on a body moving in circular path ( circular motion )

• Both these forces can occur in a simple harmonic motion. ( S.H.M )

» differences

• Centripetal force acts towards the centre of circular path while centrifugal force acts away from the centre.

• Centripetal force is inversely proportional to radius of circular path while Centrifugal force is directly proportional to radius of the circular path.

Explanation:

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.