Uniformly accelerated motion is motion with a constant, uniform change in velocity. This often, but does not always, include a change in speed. For instance, an object falling in a vacuum under the influence of gravity has nearly uniform acceleration with a change in speed, while a planet orbiting a star in a circular orbit has uniform acceleration with no change in speed.Know More
Any acceleration of an object necessarily implies a net force in the direction of acceleration. In an environment with negligible friction, a constant force of uniform magnitude produces constant and uniform acceleration. In the case of gravitational acceleration mentioned above, the constant force is gravity, which accelerates an object toward the gravitational center of another mass. This is true even if the initial direction of motion is opposite to the gravitational force, like a ball thrown straight up, because deceleration in one direction is equivalent to acceleration in the opposite direction.
In the case of an orbiting object such as a planet, the force of gravity accelerates the body not in the direction of motion, nor in the opposite direction, but at a right angle to it. This is similar to the centripetal forces that hold together the materials of a spinning wheel.Learn more about Motion & Mechanics
A change in velocity is called acceleration. It can be positive or negative, though negative acceleration, or a decrease in velocity, is often referred to as deceleration.Full Answer >
Yes, an object can be moving at the same time that it is also slowing down. During this period, its acceleration is in the opposite direction of its velocity.Full Answer >
The equation for velocity is displacement divided by time. The equations for speed and velocity are similar, but velocity must always have direction, whereas speed does not.Full Answer >
The terminal velocity of a skydiver in freefall is approximately 50 to 60 miles per second or roughly 125 to 135 mph. While the term has been popularized by skydiving enthusiasts, however, the concept of terminal velocity is applicable to the study of physics in general.Full Answer >