1.act against the direction of motion and gets larger as an object moves faster

2. an object acted upon by a net force will accelerate in the direction of that force.
3.the speed an object reaches when the force of gravity is balanced by the force of air resistance

what is friction?

terminal velocity?

friction-force that acts to oppose sliding between two surfaces that are touching

1. The quantity described in the first statement is the force of friction. Friction is a force that opposes the motion of an object and its magnitude depends on the coefficient of friction and the normal force. To calculate the force of friction, you can use the equation: force of friction = coefficient of friction x normal force.

2. The second statement describes Newton's second law of motion. According to this law, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. The equation to calculate acceleration is: acceleration = net force / mass.

3. The third statement describes the state of equilibrium between the force of gravity and the force of air resistance. When an object falls through the air, gravity pulls it downward while air resistance pushes upward. At a certain speed, the force of air resistance becomes equal to the force of gravity, resulting in a state of balanced forces. This speed is called the terminal velocity. To calculate the terminal velocity, you need to consider the object's mass, the gravitational force, and the drag coefficient of the object. The equation to calculate terminal velocity is: terminal velocity = (2 x mass x gravitational force) / (density of fluid x cross-sectional area x drag coefficient).