(a) A friend of yours pushes a crate along the floor at constant speed. They are
ID: 2076164 • Letter: #
Question
(a) A friend of yours pushes a crate along the floor at constant speed. They are puzzled because they thought that the force of their push should be equal to the change of momentum of the crate. Where did they go wrong? (b) Why does conservation of momentum imply that every force has an equal and opposite reaction force? (e) A 75 kg baseball player slides 8 feet in 1.25 seconds, coming to rest at first base. (cl) Identify and list all the significant forces acting on the baseball player. (c2) Draw a free body diagram depicting the forces acting on the baseball player. Make sure to label the forces clearly. (c3) Find the equations of motion that link the forces acting on the player to the acceleration of the player. (c4) Find the coefficient of friction during the slide. Make sure to identity whether it is static or kinetic friction. (x1) What is the mass of the bucket as a function time? (x2) How much free as a function of time, must you apply as a function of time if you are lifting the bucket at a steady velocity of 4 m/s? (x3) How mach force as a function of time, would you have to apply if you want the bucket to accelerate upward at a rate of 4 m/s^2? Assume that the bucket starts at rest.Explanation / Answer
a) This is because the force used to push the crate balances the frictional force. Therefore, there is no change in speed and consequently momentum. Friction is a non-conservative force.
b)An equal and opposite force implies an equal change in momentum along opposite directions, This conserves the net momentum.
c)i)Gravitational force,Normal Force and Frictional force
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