Read the scenario.
A cyclist is riding his bike at a constant speed of 5 m/s, and experiences a frictional force between the bike and sidewalk of 100 N. The cyclist then changes his speed to 10 m/s.
What effect does this increase in speed have on the frictional force between the bike and sidewalk?
The increase in speed from 5 m/s to 10 m/s does not directly affect the frictional force between the bike and sidewalk. Frictional force depends on the normal force and the coefficient of friction between the surfaces in contact. In this scenario, the normal force and the coefficient of friction between the bike and sidewalk remain constant, so the frictional force will also remain constant at 100 N.
Read the scenario.
A cyclist is riding his bike at a constant speed of 5 m/s, and experiences a frictional force between the bike and sidewalk of 100 N. The cyclist then changes his speed to 10 m/s.
What effect does this increase in speed have on the frictional force between the bike and sidewalk?
The frictional force increases, but does not double because although friction increases with increasing speed, it does not increase as fast.
The frictional force between the bike and sidewalk stays the same because speed does not affect frictional force.
The second statement is correct - the frictional force between the bike and sidewalk stays the same because speed does not affect frictional force.
The effect of the increase in speed on the frictional force between the bike and sidewalk can be determined by examining the factors that influence friction. In this case, the frictional force can be estimated using the equation:
Frictional force = coefficient of friction × normal force
Since the normal force remains constant (assuming the weight of the cyclist and the bike do not change), we can focus on the coefficient of friction. The coefficient of friction is a constant value that depends on the nature of the surfaces in contact.
Based on the given scenario, the coefficient of friction is not provided. Without this information, we cannot determine the exact effect of the increase in speed on the frictional force. The coefficient of friction may remain constant or change, depending on various factors such as the condition of the bike tires and the sidewalk surface.