How Does Friction Impact Acceleration and Constant Speed in Motion?

AI Thread Summary
When a force of 10N is applied to a block that requires the same force to overcome static friction, the block will not move until the force exceeds the static friction threshold. Once in motion, if the applied force remains at 10N, it will equal the dynamic friction force opposing the motion. Consequently, the block will travel at a constant speed rather than accelerate, as the net force acting on it is zero. This demonstrates the relationship between friction, applied force, and motion in terms of acceleration and constant speed. Understanding these dynamics is crucial for analyzing motion in physics.
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If the force I need to apply to a block before it starts moving is 10N, and the same force of 10N is continually applied thereafter, will the block accelerate or travel at constant speed (taking into consideration the presence of static and dynamic forces of friction) and why?
 
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TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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