Any considerable amount of force is needed to change the speed of an object, if it is moving with constant speed in one direction. If the force applied is in the same direction in which an object is moving, speed of the object will increase. If force is in opposite direction of the motion, speed of object will decrease. If force is always perpendicular to the direction of motion of an object, it will move in a circle.
Further explanation:
Newton’s first law states that an object will remain in its initial state of the motion until and unless an external force is applied on the object. It means, object will remain in motion if it was in motion and it will remain at rest if it was initially at rest until and unless an external force is applied on the object.
Given:
An object is moving at a constant speed in one direction.
Concept:
Acceleration is defined as the rate of change of velocity with respect to time. Acceleration will be zero if change in the velocity with time is zero.
We know that velocity is a vector quantity because it has magnitude as well as the direction.
In the question object is moving in one direction, therefore direction is not changing with time, and also the magnitude of the velocity of an object is constant. So the acceleration of the object is zero.
Acceleration is caused due to the force. If all the forces on the object are in equilibrium, the net force on the object will be zero and acceleration of object will also be zero.
Now if we want to change the speed or direction of the object, it is needed to exert an external force on the object. If a net force is exerted on the object, it will be subjected to an acceleration which causes change in speed or change of direction of the object.
Thus, any considerable amount of external force is needed to change the speed or direction of the object.
Learn More:
1. A 30kg block being pulled across a carpeted floor https://brainly.com/question/7031524
2. Net force acting on a 200kg refrigerator https://brainly.com/question/7031524
3. Max and Maya are riding on a merry-go-round https://brainly.com/question/8444623
Answer Details:
Grade: High School
Subject: Physics
Chapter: Laws of motion
Keywords:
Object, moving, constant, speed, one, direction, needed, change, speed, direction, considerable, force, acceleration, zero acceleration.
