Equal Kinetic Energy for Different Masses?

AI Thread Summary
A golf ball and a football can possess the same kinetic energy despite differing masses due to the relationship defined by the kinetic energy formula, Ek = 1/2mv². This equation shows that kinetic energy is dependent on both mass and the square of velocity. Therefore, if the lighter golf ball moves at a higher speed than the heavier football, they can achieve equal kinetic energy. The discussion emphasizes understanding how variations in speed can compensate for differences in mass. This concept is fundamental in physics and illustrates the principles of energy dynamics.
kylepetten
Messages
25
Reaction score
0

Homework Statement



Explain how a golf ball and a football can have the same kinetic energy even if their masses are different.



Homework Equations



None.


The Attempt at a Solution



A golf ball and a football can have the same kinetic energy even if their masses are different because kinetic energy is a quadratic function of speed.

This is a new topic and I missed a class or two on it so it may be a super easy question but I just wanted to see what you guys and gals think! Thanks!
 
Physics news on Phys.org
kylepetten said:

The Attempt at a Solution



A golf ball and a football can have the same kinetic energy even if their masses are different because kinetic energy is a quadratic function of speed.


Well in essence yes, since Ek=1/2mv2, they can have the same Ek if they move with different speeds.
 
rock.freak667 said:
Well in essence yes, since Ek=1/2mv2, they can have the same Ek if they move with different speeds.

Thanks for the help!
 
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...
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
Back
Top