which statement about friction is true?
A. Static friction and kinetic friction in a system always act in the same direction as each other and in the same direction as the applied force.
B. Static friction and kinetic friction in a system always act in opposite directions of each other and in the same direction as the applied force.
C. Static friction and kinetic friction in a system always act in opposite directions of each other and in the opposite direction of the applied force
D.Static friction and kinetic friction in a system always act in the same direction as each other and in the opposite direction of the applied force.****
I agree
The correct statement about friction is D. Static friction and kinetic friction in a system always act in the same direction as each other and in the opposite direction of the applied force.
To determine which statement about friction is true, let's analyze each option and understand their components.
Option A states that static friction and kinetic friction always act in the same direction as each other and in the same direction as the applied force. To verify this statement, we need to understand the difference between static and kinetic friction. Static friction is the force that resists motion between two surfaces that are not moving relative to each other, while kinetic friction is the force that opposes the relative motion of two surfaces that are already in motion.
In general, static friction prevents two objects from sliding past each other when a force is applied to them, whereas kinetic friction acts to slow down the motion of objects already in motion. Therefore, static friction and kinetic friction typically act in opposite directions. Additionally, the statement claims that both types of friction act in the same direction as the applied force, which is not always the case.
Option B states that static friction and kinetic friction always act in opposite directions to each other and in the same direction as the applied force. This is generally true. Static friction opposes the applied force to prevent motion, whereas kinetic friction opposes the motion itself. So, they act in opposite directions. Both types of friction work against the applied force, preventing or slowing the object's motion.
Option C states that static friction and kinetic friction always act in opposite directions to each other and in the opposite direction of the applied force. This is not true since kinetic friction acts in the same direction as the applied force, while static friction opposes it.
Lastly, option D states that static friction and kinetic friction always act in the same direction as each other and in the opposite direction of the applied force. This is also not true because static friction and kinetic friction generally act in opposite directions.
Therefore, based on the options provided, the correct statement regarding friction is B. Static friction and kinetic friction in a system always act in opposite directions to each other and in the same direction as the applied force.