A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. The coefficient of kinetic fric
1 answer:
Answer:
C. 180 N
Explanation:
= mass of the blocking sled = 60 kg
= Coefficient of kinetic friction = 0.30
= kinetic frictional force acting on the sled
kinetic frictional force acting on the sled is given as
=Force applied
For the sled to move at constant speed, the applied force must be same as the frictional force
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Answer:
Having a bigger angle above the horizontal
Explanation:
Applying the energy conservation theorem:
The kinetic energy is reduced because of the work done by the friction force.
The friction force is given by:
so the friction force depends on the Normal force, because the slide has an angle the normal force is given by:
So when the angle of the slide is bigger, the friction force decreases, for example:
for 45 degrees:
for 75 degrees:
as you can see if the angle is bigger above the horizontal, the friction force is reduced and so the work done by that force. We didn't have to change the height of the slide, so the potential gravitational energy remains the same.