Force Mass and Momentum

what is friction

friction is a force that opposes motion. it tends to slow or stop one surface sliding against another.

what is a force

A force causes the velocity of an object to change (causes the object to speed up, slow down or change direction).

what is the si unit of force

the si unit of force is the newton (N)

what is the relationship between acceleration of a body and the force acting on it

the acceleration of a body is directly proportional to the force causing it. that is for a given body: a ∝ F

what is Mass

the mass(m) of a body is a measure of the amount of matter in that body, or a measure of how difficult it is to accelerate that body.

what is the Si unit of Mass(m)

the Si unit of mass is the kilogram(kg). the kilogram is one of the seven Si base (or fundamental) units.

what is the value of a Newton

1 Newton(N) is the force that gives a mass of 1 kilogram an acceleration of 1 m s^-2

what is the force formula

F = ma (force = mass x acceleration)

what is a center of mass

The center of mass of a body is the point through which the line of action of a force must pass if the body is to accelerate without rotating.

what is the def of weight

The weight of an object is the force of the earths gravity acting on it

W = mg

what is the def of center of gravity

the center of gravity of a body is the point through which the entire weight of the body acts

in LC physics the center of gravity = center of mass

what is the formula for momentum

momentum = mass x velocity ; p = mv

what is newtons first law of motion

newtons first law of motion states that every body will remain at rest or a constant velocity unless an external force acts on it.

what is newtons second law of motion

newtons second law of motion states that when a force acts on a body, the rate of change of the body’s momentum is directly proportional to the force and takes place in direction of the force.

what is newtons third law of motion

newtons third law of motion states that action and reaction are equal and opposite.

what is the principle of conservation of momentum

the principle of conservation of momentum states that in any interaction between two or more bodies, the total momentum of the bodies before the interaction is equal to the total momentum of the bodies after the interaction,

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂