Physical Chemistry?

[Chester]

1. Explain why free-fall acceleration can be regarded as a constant for objects falling within a few hundred miles of Earth’s surface.

2. Calculate the mass in kg of an object that weighs 1,225 N on Earth.

3. Identify which of Newton’s three laws of motion specifically applies in each of the following situations:

a.You feel a force against the sole of your foot as you take a step forward.

b.A meteor moving in a straight path changes direction when it flies by Earth.

c. A full grocery cart that is pushed starts moving and increases speed, but the same push increases its speed even more when the cart is empty.

d.A skateboard moves faster in the same direction it is pushed.

4. Apply Newton’s third law of motion to explain how two billiard balls, moving toward each other at the same speed, collide and move away from each other at the same speed as before.

5. Apply the concept of momentum to compare the mass and velocity of a slow-moving train and of a high-speed bullet.

[reverendlovejoy75]

Greetings,

1. IDK? Newtons's third law?

2.Convert Newtons to kg: 1kg ~ 1.25N

a. Every reaction has an equal and opposite reaction. (third law of motion)
b. An object will remain at rest or in constant velocity unless acted upon by another force, i.e. gravity. (first law of motion)
c.F=ma (second law of motion)
d. An object will remain at rest or in at a constant velocity unless acted upon by another force. (first law of motion)

4. For every action there is a reaction so the conservation of energy says that the two billard balls will maintain there speeds before and after collision because of Newtons' third law.

5. p=mass times velocity. Momentum of train and bullet could be the same since train has more mass than bullet but is moving at slower speed.