That's the object's 'velocity'.
Velocity
When an object is moving in a particular direction, air resistance will be acting on the object in the opposite direction to the direction of travel.
Based on Newton's first Law of Motion, any (net, if two or more forces are at work) force acting on a moving object, and that, when resolved, having a component orthogonal to the direction of travel, will change the direction of the object. Simplistically, that is any force that acts on the object at an angle to the direction of motion. Resolution of a vector (of which force is a member) involves breaking down the vector along the three orthogonal axes (x, y, and z in the Cartesian system). For the sake of convenience, one of three axes should be along the direction of travel. =================================
Air resistance is affected by surface area and Shape
[object Object]
Velocity
When an object is moving in a particular direction, air resistance will be acting on the object in the opposite direction to the direction of travel.
Speed and direction together are an object's velocity.
It will travel in the direction of the velocity. I guess learning physics pays off....
Yes. A moving object travels in a straight line at constant speed until a net force acts on it. However, the direction will only change if the force is in a different direction then the motion.
That depends, in what direction it is moving initially, and at what speed. Inertia is the tendency to MAINTAIN a velocity.
Based on Newton's first Law of Motion, any (net, if two or more forces are at work) force acting on a moving object, and that, when resolved, having a component orthogonal to the direction of travel, will change the direction of the object. Simplistically, that is any force that acts on the object at an angle to the direction of motion. Resolution of a vector (of which force is a member) involves breaking down the vector along the three orthogonal axes (x, y, and z in the Cartesian system). For the sake of convenience, one of three axes should be along the direction of travel. =================================
Air resistance is affected by surface area and Shape
[object Object]
No. An object is accelerating if it is changing speed or direction of travel. Since the person in question is running at a constant speed in a straight line, they are not accelerating.
You might be referring to velocity. It is a vector physical quantity and both speed AND direction are required to define it. One can also consider velocity as the rate at which an object changes position.
The Doppler part only detects motion towards and/or away from the radar antenna. To find a direction of travel (on any radar) you must watch the object (such as a storm) over time and watch it move. To find motion by doppler the radar must detect the frequency difference of the return signal - there will be a (very) small increase if the object is moving closer (and lower if moving away).