Answer:
It is called force of friction
Explanation:
The force of friction is a force that acts between two objects whose surfaces are in contact with each other.
Consider the typical case of an object sliding along a certain surface. There are two types of frictions:
- Static friction: this is the force of friction that acts when the object is not in motion yet. If you push the object forward with a force F, the object will not move immediately, but it will "oppose" to this motion with a force of static friction exactly equal to the push applied:
However, this force of static friction has a maximum value, which is given by
where
is the coefficient of static friction
N is the normal reaction exerted by the surface on the object
So, when becomes greater than , the static friction is no longer able to balance the push applied, and the object will start sliding forward.
- Kinetic friction: this is the force of friction that acts when the object is already in motion. Its magnitude is given by
where
is the coefficient of kinetic friction, and its value is generally smaller than . The direction of this force is also opposite to the direction of motion of the object.
Explanation:
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Answer: Gravitational force
Explanation:
The sun is known as a star in the centre of the solar system. It is the most important source of energy for life on earth. It is also known as a yellow dwarf star with gravity that holds the solar system together in its orbit. Our seasons, ocean current, weather, climate and radiation belts are motivated by the interaction between the sun and earth. The sun is made up of 91% hydrogen and 8.1% helium by atoms, 70.6%hydrogen and 27.4% helium by mass.
The sun and other stars masses are held by Gravitational force attraction that accounts for the great heat and light they generate.
Gravitational force is the force by which planets or other body draws objects toward its center. The gravitational force of the sun keep the earth in orbit around which enables the great heat and light generated by the sun. This also applies to other stars.
Answer:
599 N/m
Explanation:
Let k (N/m) be the spring constant. According to the law of energy conservation, the total mechanical energy (kinetic and elastic) any any point along the spring must be the same:
Answer:
The speed of the piñata immediately after being cracked by the stick is .
Explanation:
Using the conservation of linear momentum:
(1)
Here:
m(s) is the mass of the stick
m(p) is the mass of the piñata
v(is) is the initial velocity of the stick
v(fp) is the final velocity of the piñata
So, we just need to solve the equation (1) to v(fp).
I hope it helps you!