(serway 9th ed., 9-3) at one instant, a 17.5-kg sled is moving over a horizontal surface of snow at 3.50 m/s. after 8.75 sec has elapsed, the sled stops. use a momentum approach to find the average friction force acting on the sled while it was moving. (ans. 7.00 n)

F = 7 N

Explanation:

given,                                

mass of sled = 17.5 Kg                                    

speed of snow on horizontal surface = 3.5 m/s

time taken to stop = 8.75 s

initial momentum              

  = m U                              

 = 17.5 x 3.5 = 61.25 Kg.m/s

final momentum                        

final velocity = 0 m/s            

final momentum = 0                    

impulse = change in momentum

impulse = force x time    

equating both the formula of impluse    

F x t = 61.25 - 0

F x 8.75 = 61.25            

F = 7 N                                                

Force acting on the moving sled is equal to F = 7 N

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

a.   mass number from atomic number