Exercises 23, 24, 25, 26, and 27 describe a situation. For each, identify all forces acting on the object and draw a free-body diagram of the object. An ice hockey puck glides across frictionless ice.

Video transcript

Hey, everyone in this problem, we are asked to use the scenario described in the problem to identify the forces applied to the object and create a free body diagram. And the scenario we're given is a block of wood drifts on a frictionless wet surface. The answer choices show free body diagram with different forces present in each. In a, we have the weight directed downward, the normal force directed upward and the net force directed to the right in B we have the weight directed downward, the normal force directed upward, kinetic friction directed to the left and the net force directed to the right. In C we have the weight directed downward, the normal force directed upward, The net force directed is zero. And indeed, we have the weight directed downward, kinetic friction directed to the left and the net force directed to the right. So let's go back up to where we have our scenario. And we're gonna draw out this free body diagram. So we're drawing our free body diagram, we have our object at the center. And in this case, it's a block of wood. Now, when we have an object on a surface we always have the normal force pointing straight upwards and let me fix that a little bit on an angle. We have the normal force pointing straight up from the surface perpendicular. So we have our normal force and we also have the force due to gravity, the block of wood has some mass. And so we're gonna have some force due to gravity or the weight of the object acting downwards. Now, what else we're told that this is a frictionless surface. So we don't have any kinetic friction directed to the left or to the right. So these are the only two forces acting on our block. Now, if we have this normal force pointing up this force of gravity pointing down and no forces acting left to right, then our net force F net, this is going to be equal to zero and the sum of the forces is zero. In this case, if we compare that to our answer choices, we see that that corresponds with answer choice C okay. We drew the weight directed downward, the normal force directed upward and the net force is zero. That's it for this one. Thanks everyone for watching. See you in the next video.