# Physics

posted by .

I got a few questions that I need to be checked please?

Why does a brick weigh 1 kilogram. Explain.

-Would it be cause there are not other forces acting on it that's why it weighs 1 kilogram?

Why do lurch foward when a bus slows down? What law is this?

-Is it because the bus is still in motion and you are at rest causing you to lurch foward. It is Newtons first law: the law of intertia

• Physics -

yes and yes

• Physics -

For the first one, look up weight and the gravitational force of the earth.
For #2, inertia is ok but the reasoning is wrong. The bus is moving a some speed and the passengers in the seats are moving at the same speed (perhaps I should be saying velocity). When the bus slows down to, say, half that speed, the passengers still are going at the original speed so they try to move forward. That's why the lurch is forward. That's why a head on collision is so deadly. The two cards stop within the blink of an eye BUT the two drivers of the two vehicles keep moving--often through the windshield.

## Similar Questions

1. ### Physics

Please check my answers: Why does a brick weigh 1 kilogram. Explain. -Is it because the matter in the brick is the gravitational pull between the brick and the earth?
2. ### Variation

I have few questions that I need checked please and could you help me with the last question?
3. ### Science-Space Exploration

Could someone please have a few moments to go through my other previous posts on Exploring Space, thanks. I need them to be checked over, and any other information would be appreciated, thanks again:-)

A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true?
5. ### Physics - Multiple choice

An object is moving in a circle at a constant speed. From this you can be certain that a) there are at least two forces acting on the object, which balance each other. b) there are at least two forces acting on the object, which do …
6. ### Mathematics

If a brick weighs exactly as much as a 9-pound rock plus falf of another brick, what does a brick and a half weigh?
7. ### Mathematics

If a brick weighs exactly as much as a 9-pound rock plus falf of another brick, what does a brick and a half weigh?