Momentum-an egg dropped on the ground vs. grass

In summary, the question asks why an egg dropped on the road breaks while an egg dropped on grass does not break. The correct answer is that the time interval for stopping is greater for the egg on grass, as the grass slows it down before it hits the ground. This is because change in momentum is force, and force is mg for both situations. Eliminating options a and b, the correct answer is c - the time interval for stopping is greater. It should be noted that the question is poorly phrased and it is unclear which result is being asked to be explained.
  • #1
girl52
7
0

Homework Statement



an egg dropped on the road breaks, while the egg that is dropped on grass doesn't break...why?

a. the change in momentum is greater
b. change in momentum is less
c. the time interval for stopping is greater
d. time interval for stopping is less

Homework Equations



there are no equations...

The Attempt at a Solution



im guessing, the time interval for stopping is greater cause the grass slows it down before it hits the ground?
 
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  • #2
change in momentum is force, and force is mg for both situation. i think ur right.
 
  • #3
change in momentum - impulse. do you have the answer to this question ?
 
  • #4
phever said:
change in momentum - impulse. do you have the answer to this question ?

no...it's a take home test worth a lot of points so i want to be 100% sure i got it right
 
  • #5
welcome to pf!

hi girl52! welcome to pf! :wink:
girl52 said:
im guessing …

nooo, don't guess :rolleyes:

eliminate a and b so that you can be sure

why can't it be a or b ? :smile:
 
  • #6
girl52 said:

Homework Statement



an egg dropped on the road breaks, while the egg that is dropped on grass doesn't break...why?

a. the change in momentum is greater
b. change in momentum is less
c. the time interval for stopping is greater
d. time interval for stopping is less

What a terribly phrased question; Which particular egg are they expecting the answer to apply to? In other words, are they asking why the road egg broke, or why the grass egg didn't?
 
  • #7
I think that they want to know why the other egg didn't brake mostly because it is more intuitive that the egg will brake than that it won't.
 
  • #8
madah12 said:
I think that they want to know why the other egg didn't brake mostly because it is more intuitive that the egg will brake than that it won't.

The point is, it should be absolutely clear which result is to be explained. This is physics, not psychics. Would *you* want to risk several points on a marker's interpretation of the question?
 

Related to Momentum-an egg dropped on the ground vs. grass

1. What is momentum?

Momentum is the measure of an object's mass and velocity. It is a quantity that describes how difficult it is to stop an object in motion.

2. How does an egg dropped on the ground vs. grass demonstrate momentum?

When an egg is dropped on the ground, the hard surface causes a sudden stop in its motion, resulting in a high force and change in momentum. On the other hand, when an egg is dropped on grass, the impact is spread out over a larger area and the change in momentum is less, making it less likely to break.

3. Why does an egg dropped on grass have a lower change in momentum compared to dropping it on the ground?

This is because grass is a softer surface with more give, meaning that the impact of the egg is spread out over a larger area and therefore, the force and change in momentum are reduced.

4. Can the mass of the egg affect its momentum when dropped on grass or the ground?

Yes, the mass of the egg will affect its momentum as it is a factor in the equation for momentum (p=mv). The greater the mass, the greater the momentum the egg will have when dropped on both grass and the ground.

5. How does the velocity of the egg affect its momentum when dropped on grass or the ground?

The velocity of the egg also plays a role in the momentum it has when dropped on both grass and the ground. The greater the velocity, the greater the momentum of the egg will be when it impacts the surface.

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