SPRING 2005

 

HOMOKINETICS II

ASSIGNMENT # 6

 

 

1.      Two skaters gliding on ice run into each other head-on.  If the two skaters hold onto each other and continue to move as a unit after the collision, what will be the resultant velocity?  Skater A is moving to the right and has a velocity of 5 m/s and a mass of 65 kg.  Skater B is moving to the left and has a velocity of 6 m/s and a mass of 60 kg.

 

 

 

 

 

 

 

 

 

 

2.      A bowler releases a ball with a mass of 7.2 kg at 3.3 m/s.  At what velocity would a 4.5 kg ball have to be released so that it has the same momentum as the more massive ball?

 

 

 

 

 

 

 

 

 

 

 

 

3. One of your students is performing a prone push-up.  The weight that is exerted on the

    elbow joint is 150 N and the coefficient of friction is 0.89.  Determine the force that is

    created at the elbow joint that initiates the movement at that joint.

 

 

 

 

 

 

 

 

4. The following table shows the results obtained when several vaulting horses were

    tested to determine how much horizontal force could be exerted against them before

    they began to slide.

  1. Determine the coefficient of friction for each horse.
  2. For which horse was the highest coefficient of friction recorded?
  3. For which horse was the lowest coefficient of friction recorded?

 

MAKE                                        WEIGHT                       FORCE TO INITIATE

(N)                     SLIDING (N)

 

American                                       1530                                        805

Gym Master                                    1588                                             779

Medart                                            2011                                             716

Mitufa                                             756                                              187

Nissen                                            1190                                             587