29

Physics Force & Laws Of Motion Level: High School

A box of mass 8.3 kg placed on a smooth horizontal table is acted on by two horizontal forces . The first of magnitude 0.3 Newton's acts due East , and the second of magnitude 0.3 Newton's acts due North . Find the velocity of the box after 14.9 seconds .

26

Physics Force & Laws Of Motion Level: High School

A stone of m = 0.8 kg is projected across a sheet of ice with an initial speed of 2.40m s^-1 . The coefficient of sliding friction between the stone and the ice is 0.0250 . How far will the stone travel before it come to rest ? Take g = 9.81m s^-2 .

24

Physics Force & Laws Of Motion Level: High School

Blocks A and B are moving towards each other along the X axis. A has a mass of 4.00 kg and a velocity of 30.0 m/s ( in the positive X direction), While B has a mass of 2.00 kg and a velocity of -25.0 m/s (in the negative direction). A) Assume they sugffer an elastic head-on collision and move off along the X axis. What will be the velocity of A and B , respectively , after the collision ? B) Using the information from a) and using impulse-momentum theorem, calculate the force acting on block A due to block B if the collision took a time of 0.256s C) If these same two blocks were to have a perfectly inelastic head-on collision, what would the velocity of the combined block system be and what would be the loss in KE?

23

Physics Force & Laws Of Motion Level: High School

A girl and her bicycle have a total mass of 40.0 kg. At the top of a hill her speed is 5.00 m/s the hill is 10.0 m high vertically and 100.0 m along the incline use work energy methods A) Take friction to be acting . If her speed was 10.0 m/s as she arrives at the bottom of the hill , how much mechanical energy is lost to friction? Note girl doesn't pedal . B) From your answer to part A calculate the force of the frictional resistance of the air , etc , that is removing useful mechanical energy from the system as the girl rolls down the hill . C) Now if the girl and her bike coast along level ground , how far will she coast if the coefficient of the Kinetic Friction is 0.300 ?

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