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1 vote
Accepted

Buoyant force on a stick making an angle theta with the vessel

Divide the underwater world into two parts - the water and the stick. Suppose the water disappeared, leaving the stick. The force on the stick would be the weight of the stick. Suppose you replaced ...
• 40.5k

Calculating vehicle and tire acceleration with tire slipping

I believe I've come up with the solution. What helped was separating out the wheels from the rest of the vehicle rather than treating them all as one in the FBD. Specifically, the tires are exerting ...
• 103

Forces accelerating a tire

Just consider the forces on the wheel - ignore the forces exerted by the wheel on the ground. The four forces on the wheel are: (a) its weight - your downwards red arrow (b) the normal force from the ...
• 56.1k
1 vote
Accepted

Forces accelerating a tire

I suggest a simple model to cover the no slipping and the slipping situation. Why don't the green and blue arrows simply cancel out, resulting in no acceleration/motion? Because the forces act on ...
• 97.8k

Why do objects with greater length feel heavier - and how to calculate perceived weight?

I expect a long hose is harder to drag because most of the length is pressing on the concrete. There is a lot of friction. You could pick up a shorter object, eliminating the friction. @Paulina mostly ...
• 40.5k
Accepted

Why do objects with greater length feel heavier - and how to calculate perceived weight?

There is indeed an accurate way to calculate the amount of what you call "effort". In physics, this concept is known as work $W$, and is the energy transferred to an object by letting a ...
• 1,809
1 vote

Does the direction of the torque acting on a car tire change depending on which direction the tire is rotating?

car tires will fly off perpendicular to the direction of a moving car I'm not sure this is true. I've seen cases where they move in about the same direction the car was. because of the torque ...
• 29.9k
1 vote

In a magnetic field, does the force act on the midpoint of the current carrying wire?

The key concept and word here is equipollent. Two systems of forces are "equipollent" if they have the same total force and same moments about any point. The magentic force taken to act at ...
• 54.4k
Accepted

In a magnetic field, does the force act on the midpoint of the current carrying wire?

Believe it may just be a convenient approximation since the force is actually distributed along the entire length of the wire, which would be harder to represent in an FBD. When they say forces F1 and ...
• 324
1 vote

Why isn't the moment always included in a free-body diagram?

The moment is not always included in a free-body diagram because its presence depends on the type of support or connection involved. If a support restricts rotation (such as a fixed support), then a ...
• 324