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?
Responses
The frictional force doubles because when speed increases frictional force also increases.
The frictional force doubles because when speed increases frictional force also increases. - no response given
The frictional force becomes half of what it was because when speed increases, frictional force decreases.
The frictional force becomes half of what it was because when speed increases, frictional force decreases. - no response given
The frictional force between the bike and sidewalk stays the same because speed does not affect frictional force.
The frictional force between the bike and sidewalk stays the same because speed does not affect frictional force. - no response given
The frictional force increases, but does not double because although friction increases with increasing speed, it does not increase as fast.
The frictional force increases, but does not double because although friction increases with increasing speed, it does not increase as fast. - no response given
i got it wrong
I'm sorry to hear that. Remember that frictional force depends not only on speed but also on other factors such as the type of materials in contact and the weight of the object. In this scenario, the increased speed of the cyclist will result in an increased frictional force between the bike and sidewalk, but it will not necessarily double. Instead, it will depend on the specific conditions of the situation.
The correct answer is:
The frictional force increases, but does not double because although friction increases with increasing speed, it does not increase as fast.