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  • 0 posts edited
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  • 11 votes cast
Dec
3
comment In terms of forces and kinematics, why does a projectile, thrown forwards, bounce forwards?
This video is also helpful youtube.com/watch?v=yS-n_1Zdtv4, you can see how the ball changes rotation everytime it bounces.
Dec
3
comment In terms of forces and kinematics, why does a projectile, thrown forwards, bounce forwards?
Yes, it starts slightly rolling forward. Depending on the lenght of the contact. You can slightly see it in the video, but you can observe it yourself. If you throw non-rotating ball on the ground, with some forward velocity, it will bounce with rotation.
Dec
3
answered In terms of forces and kinematics, why does a projectile, thrown forwards, bounce forwards?
Dec
2
answered How does heat damage the body?
Dec
2
comment Lift provided to an aeroplane
The Wikipedia article en.wikipedia.org/wiki/Lift_(force) is very detailed and provides very accessible explanation. It also has very good section on various misconceptions. From my experience, only minority of people who were explaining lift to me in the past got it right.
Dec
1
awarded  Commentator
Dec
1
comment Can a wheeled vehicle remain stationary on a water surface?
I am afraid you question contains a lot of loopholes that offer several easy solutions and cannot be closed without ruining the question. For instance, you cannot really stay above water, at least some part of the vehicle has to be a bit sumberged, to be in contact. How much submersion do you allow? Why? Do you allow some fins or rotors attached to the wheels? Or what about if finned wheels spin so fast that the vehicle will essentialy almost fly above water thanks to redirected air? I think the answer is obviously yes. It is possible for stationary vehicle to remain on the surface.
Dec
1
answered Does it make sense for physics to predict the unphysical?
Dec
1
answered Explain the notion of light/electromagnetic waves/photons to a non-physicist
Dec
1
answered Momentum Equation VS Momentum of Momentum Equation
Nov
30
comment Why we use liquid crystals in LCDs?
It does not. Have you seen the video?
Nov
30
answered Why we use liquid crystals in LCDs?
Nov
30
answered Managing nuclear waste
Nov
30
comment Conservation of mechanical energy isn't giving me the right answer?
Mechanical energy is not conserved when there is a friction so you cannot use this method. You can verify it in simpler case: Suppose you pushed the package on a flat surface - its potential energy does not change, yet the package will lose kinetic energy as it will stop due to friction. Mechanical energy is not conserved - some/all of it will escape the system as heat.
Nov
27
comment To find the speed of a travelling pulse from given equation
I understand. I have hidden the question for a while, but now OP obviously solved the thing, i undeleted it to show an alternative solution.
Nov
27
answered To find the speed of a travelling pulse from given equation
Nov
26
comment Why is the gravity in a mine shaft independent of depth if the local density is 2/3 of the average density?
Can you cite a source? Assuming homogenous earth, gravitational acceleration decreases linearly with depth, with zero at the center of earth. I don't know what you call a "local density", but any density disturbances close to the shaft should not have a significant effect.
Nov
25
awarded  Yearling
Nov
25
revised Best angle to pull an object
added 202 characters in body
Nov
25
answered Best angle to pull an object