Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest and an object in motion will continue in motion with a constant velocity unless acted upon by an external force.
Newton's second law of motion states that the force applied to an object is directly proportional to its mass and acceleration, and inversely proportional to its mass. This can be expressed as the equation F=ma, where F is force, m is mass, and a is acceleration.
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will also exert an equal and opposite force on the first object.
Mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity acting on an object. In terms of Newton's laws of motion, mass is used in the equation F=ma to calculate the force required to accelerate an object, while weight is the force that an object experiences due to gravity.
Friction is a force that opposes motion and is caused by the interaction between two surfaces. According to Newton's laws of motion, friction acts in the opposite direction of an object's motion, and can either slow down or stop the object's motion entirely.