What causes a moving object to continue moving at the same velocity unless an unbalanced force acts on it?
Inertia causes a moving object to stay in motion at the same velocity (speed and direction) unless a force acts on it to change its speed or direction. It also causes an object at rest to stay at rest. When the car hit the wall (unbalanced force), the car stopped moving, but the man kept moving because of inertia.
What do you mean by state of motion?
The state of motion of an object is defined by its velocity – the speed with a direction. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force.
What 3 things can a force change?
A force can do one of four things to an object:
- Make it speed up – accelerate.
- Make it slow down – decelerate.
- Change its direction.
- Change its shape.
What is the force at constant velocity?
If a body is moving with constant velocity, acceleration is zero. So net force acting on it will be also zero. But the body has energy due to its constant motion.
What is the relationship between velocity and acceleration?
Acceleration is the rate of change of velocity. (when velocity changes -> acceleration exists) If an object is changing its velocity, i.e. changing its speed or changing its direction, then it is said to be accelerating. Acceleration = Velocity / Time (Acceleration)2018年6月12日
Can acceleration change if velocity is constant?
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
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.
Does constant speed mean constant velocity?
To have a constant velocity, an object must have a constant speed in a constant direction. Constant direction constrains the object to motion to a straight path. Newton’s second law (F=ma ) suggests that when a force is applied to an object, the object would experience acceleration.
What is the difference between constant speed and constant velocity?
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is constant, its velocity is changing. Velocity, being a vector, has a constant magnitude but a changing direction.
What is the difference between constant velocity and constant acceleration?
Traveling with a constant velocity means you’re going at the same speed in the same direction continuously. If you have a constant velocity, this means you have zero acceleration. If you travel with a constant acceleration, your velocity is always changing, but it’s changing by a consistent amount each second
What does it mean if acceleration is constant?
Constant acceleration means that the acceleration does not change. Some would say that if the acceleration is zero then the acceleration does not change and so one can say that the acceleration is constant
What are two factors that affect acceleration?
The acceleration of an object depends on the mass of the object and the amount of the force applied to it.