F-FBD-1 A baseball is thrown from right field to home plate (HP), traveling from right to left in the diagram.

A group of physics students watching the game create the following free-body diagrams for the baseball at the top of its path (point T). Note that the forces are not drawn to scale.

If they decide to ignore air friction, which is the correct free-body diagram for the baseball at point T?

F-FBD-2 A box with wheels attached to bottom is on top of a horizontal scale. Attached to one side is a horizontal rope with a spring scale to measure force (assume the scale and ropes are mass-less). On the other side of the box is a rope that has no force being applied to it.

Sketch a FBD of the box

F-FBD-3 A 10-kg-box with wheels attached to bottom is on top of a horizontal scale. Attached to one side is a horizontal rope with a spring scale to measure force (assume the scale and ropes are mass-less). On the other side of the box is a rope that now has a horizontal force equal to 150 N pulling on it.

Sketch a FBD of the box, attempting to scale each vector relative to each other.

F-FBD-4 A 10-kg-box with wheels attached to bottom is on top of a horizontal scale. Attached to one side is a horizontal rope with a spring scale to measure force (assume the scale and ropes are mass-less). On the other side of the box is a rope that now has a force equal to 150 N pulling on it in a direction 30 degrees up from the horizontal.

Sketch a FBD of the box, attempting to scale each vector relative to each other.

What is the force the spring scale measures?

What is the force the bottom scale measures?