Solving Sliding Object Down Ramp: Horizontal Forces Only?

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SUMMARY

The discussion centers on the calculation of net force (Fnet) for an object sliding down a ramp, emphasizing the importance of considering only horizontal forces. The participant initially believed that all forces should be summed, but clarification revealed that only horizontal components affect acceleration in this context. The distinction between positive forces, such as those acting downward, and negative forces, like friction, is crucial for accurate calculations of motion along the ramp.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with vector components of forces
  • Basic knowledge of friction and its effects on motion
  • Ability to calculate net force and acceleration
NEXT STEPS
  • Study the concept of vector decomposition in physics
  • Learn about the role of friction in motion analysis
  • Explore Newton's second law of motion in detail
  • Practice problems involving inclined planes and net force calculations
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone interested in understanding the dynamics of objects on inclined surfaces.

ItsNoah
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I went to ask my teacher for extra help and we were doing a problem about an object sliding down a ramp. When I calculated the Fnet I added all the forces together acting on the box but she said that you only take into account the horizontal forces. Any clarification would be much appreciated!
 
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The reason I ask this is because I thought when adding Fnet up you add up all the forces. ALSO: i was trying to calculate acceleration so is this why you only add up the horizontal forces?
 
If the box is sliding down the ramp, then the positive forces would be the ones that are making it move, meaning the ones acting downward. The negative forces would be the ones acting opposite of motion, like friction. so when you sum the forces, make sure you have friction and any force applied upward as negatives, and then the force of the plane and any forces applied downward as positives.
 

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