What is the direction of acceleration due to gravity class 9?
The direction of acceleration due to gravity is always towards earth, irrespective of the direction of motion of a body.
What is the meaning of negative velocity?
A positive velocity simply means that the object is moving in the positive direction, as defined by the coordinate system, while a negative velocity means the object is traveling in the other direction.
Can an object have zero velocity and nonzero acceleration?
Yes. Anytime the velocity is constant, the acceleration is zero. For example, a car traveling at a constant 90 km/h in a straight line has nonzero velocity and zero acceleration. Its acceleration will change in magnitude and direction as the elevator starts and stops.
When a car’s velocity is positive and acceleration is negative?
Explanation: The car’s rate of change of position is decreasing. The car is moving but its rate of position increase is coming down. The car will eventually come to a brief stop and begin traveling backward.
Can an object’s velocity change direction when its acceleration is constant?
Yes, an object’s velocity can change direction when its acceleration is constant. Velocity is the rate of change of displacement with respect to…
Can a force change only the direction of velocity of an object keeping its magnitude constant?
Yes, a force can change only the direction of velocity and magnitude can be still constant if the force applied on body is greater than that possessed by the body.
Can an object have an eastward velocity while experiencing a westward acceleration?
Yes, it possible, in this case – ve acceleration known as retardation. Answer: An object can have an Eastward velocity while experiencing a Westward acceleration. The car will slowly stop as there will be a decelerration or in other words, an acceleration Westward.
How can the velocity of an object be changed?
Velocity of an object can be uniform or variable. It can be changed by changing the object’s speed, direction of motion or both. When an object is moving along a straight line at a variable speed, the magnitude of an object with its rate of motion is described in terms of average velocity.
Can an object have increasing speed and decreasing acceleration?
Acceleration occurs anytime an object’s speed increases or decreases, or it changes direction.
What is the velocity of a object?
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object’s speed and direction of motion (e.g. 60 km/h to the north).
Is a measure of how quickly the velocity of an object changes?
In a similar way, you can measure how an object’s velocity changes with time. The rate at which velocity changes with time is called Acceleration is a measure of how quickly the velocity is changing. If velocity does not change, there is no acceleration.
What change the velocity of a body?
The velocity of body changes with time. The velocity of an object can change if: Its speed changes. Both speed and direction change.
Who changed the velocity of a body?
Answer: The body is in motion with constant acceleration. Thus, the speed of the body moving in a straight line increases or decreases by the same amount at equal intervals of time. The velocity of an object can change if: Its speed changes.
What force is required to keep a body in uniform motion?
centripetal force
Under what conditions does a change in velocity takes place?
Explanation: An object can change velocity in a number of ways: it can slow down, it can speed up, or it can change direction. A change in speed, or a change in direction, or a change in both speed and direction means that the object has a change in velocity.
Is any change in the speed or direction of an object’s motion?
Acceleration is any change in the speed or the direction of an object’s motion. So, acceleration is any change of velocity.
Is speed a change in velocity?
A change in speed is a change in velocity – so, a change in speed is an example of acceleration! Acceleration may be positive or negative. Negative acceleration is sometimes called deceleration. When a force acts on an object; it may change the object’s acceleration (speed, direction, or both).