Read the following statements carefully and indicate true or false. -The momentu

Question

Read the following statements carefully and indicate true or false.

-The momentum of an isolated system is always conserved no matter what kind of force is acting inside the system.
-If the momentum of a single particle is zero, its kinetic energy may not be zero.
- The linear momentum of an object is proportional to the mass of the object.
- A large force always produces a larger impulse on a body than a smaller force.
- If the kinetic energy of a single particle is zero, its momentum must be zero.
- The kinetic energy is always conserved both in elastic collisions and inelastic collisions.
- If two particles of different masses have equal kinetic energy they also have equal momentum.

A 740.0 N man, carrying a 1.7 kg physics textbook, stands at the center of a frozen pond of radius 10.0 m. He is unable to get to the other side since there is no friction at all between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a speed of 7.0 m/s toward the north shore. How long (in s) does it take him to reach the south shore? Be careful about units.

Explanation / Answer

momentum conserved means there is no external force is acting on the system.so only internal forces are acting.

1)false(momentum zero, kinetic energy is also zero)

2)true(momentum is proportional to mass)

3)true (large force will give more change in momentum than small force)(impulse=change in momentum)

4)true

5)false(only it conserved in    elastic collisions but not in inelastic collisions)

6)false(k.e=p^2/m)

he throws it towards the north shore (ther is no friction between his shoes and pond surface)

for action we get equal reaction so he reach the south shore 10m

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