Explanation: Acceleration is defined as the rate of change of velocity. Velocity is a vector, which means it contains a magnitude (a numerical value) and a direction. So the velocity can be changed either by changing the speed or by changing the direction of motion (or both).
Q. When a ball player throws a ball straight up by how much does the speed?
As gravity acts down to earth and the ball is going up, speed´s ball will be decreasing by gravity ( 9.8 m/sec²) That means the speed of the ball will be decreasing 9.8 m/sec, each second.
Q. What is the rate of change of velocity?
The rate of change of velocity is ACCELERATION. Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
Q. Can acceleration be perpendicular to velocity True or false?
Answer: Velocity can be perpendicular to acceleration.
Q. What is a change in velocity called?
The rate of change of velocity is called acceleration and the kind of motion is known as accelerated motion. Acceleration is also a vector quantity, so it includes both magnitude and direction. Velocity is the rate at which displacement changes with time.
Q. Does acceleration increase with speed?
When the velocity of an object changes it is said to be accelerating. Acceleration is the rate of change of velocity with time. Acceleration occurs anytime an object’s speed increases or decreases, or it changes direction. Much like velocity, there are two kinds of acceleration: average and instantaneous.
Q. Is force directly proportional to acceleration?
As we increase the force on an object the acceleration increases proportionally. Since the mass does not change as the acceleration increases, we can say that force is equal to acceleration. Force is directly proportional to acceleration (force ~ acceleration) As force increases acceleration increases.
Q. Can a body moving at constant speed have acceleration?
If a body is moving with constant speed in a circle, then yes, that body has acceleration.
Q. Can a body have zero velocity but still have acceleration?
Yes, an object can have zero velocity and still be accelerating simultaneously. Then the object will start to move in the backward direction.
Q. Can a body move on curved path without acceleration justify?
No, a body cannot move on a curved path without acceleration because while moving on a curved path, the velocity of the body changes with time.
Q. Can a particle with constant speed be accelerating what if it has constant velocity explain?
A particle with constant speed can be accelerating, if its direction is changing. However, a particle with constant velocity cannot be accelerating — its acceleration must be zero.
Q. Why can a car accelerate while traveling at constant speed but not at constant velocity?
An object’s acceleration is the rate its velocity (speed and direction) changes. Therefore, an object can accelerate even if its speed is constant – if its direction changes. If an object’s velocity is constant, however, its acceleration will be zero. Since it travels in a straight line, its direction does not change.
Q. Why does acceleration point towards the center of a circle?
This means that whatever direction the position vector points, the acceleration vector points the opposite way. Since the position vector always points out and away from the center of rotation, the acceleration vector always points in and towards the center. In other words, the acceleration is centripetal.
Q. What keeps things in circular motion?
Specifically, you have centripetal acceleration — the acceleration needed to keep the object moving in circular motion. The centripetal acceleration always points inward along the radius toward the center of the circle. At any point, the velocity of the object is perpendicular to the radius of the circle.
Q. Why does the ball move in a circle around the person without falling down?
When the ball is spinning, there is a force acting on it which pushes it away from the centre of rotation. The only way it can get further away from that point is by moving upwards (because the string stops it from moving outwards without moving upwards).
