a hockey puck is sliding freely across a pound of friction ice. What is the free-body diagram?
To draw the free-body diagram for a hockey puck sliding freely across a level, frictionless ice, we need to consider the forces acting on it.
1. Gravity: The puck experiences a downward force due to gravity. The force of gravity is always directed straight down towards the center of the Earth.
2. Normal force: Since the puck is on a level surface, the ice exerts an equal and opposite force called the normal force. The normal force acts perpendicular to the surface of the ice and counteracts the force of gravity.
3. Friction force: In this scenario, you mentioned that the ice is frictionless. Hence, there is no friction force acting on the puck.
So, the free-body diagram for the hockey puck on the frictionless ice would only consist of two forces:
1. The force of gravity (mg) acting downward.
--> Arrow pointing downward from the center of the puck.
2. The normal force (N) acting upward.
--> Arrow pointing upward from the surface of the ice (perpendicular to the surface).
Remember, since the puck is sliding freely, there is no friction force acting on it.