Figure shows an initially stationary block of mass m on a floor. A force of magnitude 0. As mentioned below, its 0. You will notice as you work through the question these terms will cancel out, as the question is independent of mass.
Although, i would complain that it is horribly unclear. Assuming that the force is. First, we'll use Newton's laws in both the x and y direction. Let's do the y-direction first. The block isn't be lifted up, so we know the sum of the forces in the y-direction must be zero. What are the forces?
I'll give you a clue, there are 3 of them. Why do we care about the y-direction equation? Well, we can use it to solve for the normal force on the block, which is needed to find the force of friction. Second, write out Newton's second law for the second direction. This time we don't know what "a", so we will have some forces equal to an unknown acceleration times the mass. Again, I'll give you a tip: Third, we need to find out if the block is going to move in both cases. Two ways of doing this.
The first and more elegant solution is to solve for which value of the coefficient of static friction will just stop the block from moving, then see if either of the values given are greater than that value. If you do, you know the block doesn't move. Now, once you've figured out under which circumstances the block will move, plug in the value of kinetic friction given.
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We ban all bots. Hi there Reddit, I'm doing online homework for my college physics class and I don't know where I lost my textbook. Could someone help me figure out which formulas are to be used here? Here is the prompt:. Unfortunately, when the crate reaches a point The crate immediately accelerates toward the ground, dragging the hapless crewman across the ice and toward the edge of the cliff. If we assume the ice is perfectly slick that is, no friction between the crewman and the ice once he slips and falls down , 1 at what speed will the crate hit the ground?
Assume also that the rope is long enough to allow the crate to hit the ground before the crewman slides over the side of the cliff. Assume no air friction. Please don't do my homework for me, I am allowed infinite attempts on this program. All I need to know is which formulas I should use. I must have forgotten what that stands for. The rest seems to be pretty straightforward. My experience tells me schools repeat the hell out of this mixture of concepts, so perfect them.
To be perfectly honest, no. I double checked my calculations about 6 times because I expected the velocity of the crate 5. I couldn't tell you why those formulas work.
I'm good with numbers and formulas, but I'm not great with concepts. I'm not sure if that's what you were asking.
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Also useful for KS3. carnified friction homework help thanks to everything piledriving saick.
Friction Example Problem – Physics Homework Help 3 This entry was posted on July 24, by Todd Helmenstine Friction is the resistance force generated between two bodies as they move across each other.
Friction Physics Homework Help. You can get professional assignment help at our site friendlyfigre.tk Any deadline, any level! The force of friction between two bodies depends on the magnitude of the perpendicular forces of the surfaces in contact. This perpendicular force is known as the normal force .
Friction is a force that acts between two objects that are in contact with one another. It slows or stops movement between the two surfaces that are touching. Friction is the force that develops at the surfaces of contact of two bodies and impedes (opposes) their relative motion. e.g. air on an aircraft or water in a pipe. It is not a fundamental force, as it is derived from electromagnetic forces between atoms and electrons, and so cannot be calculated from first principles,.