A hockey stick strikes a puck and exerts a net horizontal force that varies with time
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A hockey stick strikes a puck and exerts a net horizontal force that varies with time. The force is directed along +x and obeys the following description:
• From t=0 to t=0.020 s the force increases linearly from 0 N to 120 N.
• From t=0.020 s to t=0.040 s the force decreases linearly back to 0 N.
For t>0.040 s, the net horizontal force is zero. The puck has mass 0.15 kg and is initially at rest.
(a) Calculate the total impulse delivered to the puck during the 0.040 s interaction.
(b) Determine the speed of the puck immediately after t=0.040 s.
(c) A coach wants the puck to leave the stick with the same speed found in part (b) but prefers to apply a constant force instead of a time-varying one. Determine the magnitude of the constant force that must be applied over the same 0.040 s interval to achieve this goal.