An example of acceleration in the direction of motion is a smooth spherical stone dropped from the roof of a building on a windless day. All the motion is straight down, toward the center of the earth, and so is the acceleration.
Throwing an object straight up in the air is an example of a motion in which acceleration is in the direction of motion. After the object is released, the acceleration due to gravity acts downward, which is in the same direction as the motion of the object as it goes up and then comes back down.
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An example of acceleration in the direction of motion is when a car speeds up while driving on a highway. As the driver presses on the accelerator pedal, the car's velocity increases in the same direction as its motion, resulting in acceleration in the direction of travel.
When acceleration is opposite to (against) the direction of motion, the magnitude of the velocity decreases, meaning that the object slows down. An example is the application of the brakes to slow or stop a car. During the time that the pressure remains on the brake pedal, the car's acceleration is negative ... meaning opposite to the direction of motion ... and the car's speed is decreasing.
An example of acceleration in the direction of motion is a smooth spherical stone dropped from the roof of a building on a windless day. All the motion is straight down, toward the center of the earth, and so is the acceleration.
Freely falling body is a good example
Scalar motion refers to motion that doesn't have a specific direction but only magnitude, such as speed. It is characterized by how fast an object is moving without consideration for the direction. For example, a car traveling at 60 miles per hour is an example of scalar motion because it only tells us the speed at which the car is moving but not the direction.
against motion For example, if I push a box to the left, kinetic friction is going to the left.
Inertia of direction is the resistance of an object to changes in its direction of motion. This concept is related to the tendency of an object to maintain its current direction unless acted upon by an external force.
When acceleration is opposite to (against) the direction of motion, the magnitude of the velocity decreases, meaning that the object slows down. An example is the application of the brakes to slow or stop a car. During the time that the pressure remains on the brake pedal, the car's acceleration is negative ... meaning opposite to the direction of motion ... and the car's speed is decreasing.
Work is zero when the force is perpendicular to the direction of motion, as it is, for example, in a circular gravitational orbit.
deceleration in a linear motion (braking during driving or an object thrown up while you are standing on on earth) --> the acceleration is pointing at an opposite direction than the motion. ============================