A body having a negative acceleration is said to be decelerating. Hence the negative acceleration of the body can be called the deceleration of the body. The instantaneous deceleration of the body can be expressed as a=−dvdt ———- (1).

An object which moves in the negative direction has a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).

So friction is a force that work opposite the direction you rub an object against another object. If the friction is negative then the direction will be the same as you rub an object against another object.

Speed is the magnitude of velocity. Velocity comes with direction, it indicates a speed at a direction. If velocity becomes negative, it is that speed in the opposite direction.

A negative acceleration means that the change in the velocity points in the negative direction. For example, the velocity could be in the positive direction and the object slowing down or the velocity could be in the negative direction and the object speeding up.

“Negative” acceleration typically happens in two cases. One of them is from slowing down, and one of them is based on frames of references. This “negative” acceleration is actually called deceleration. It means that over time, you are slowing down instead of speeding up- your velocity is continously decreasing.

(d) Maximum negative value of acceleration will occur when rate of change of velocity in decreasing sense (slope of the velocity-time curve) is maximum negative. From the figure we see that this occurs at t=8 s To find the value of this acceleration, draw a tangent to the curve at t=8 .

so if the velocity does not change with time the acceleration is necessarily zero. Since in your example the velocity is constant during the interval that means dv/dt=0 and therefore that a=0 during the interval.

For the most part velocity is not zero if an object is accelerating. Since acceleration is the change in velocity over time, there has to be a change in velocity for something to accelerate. If the velocity is constant however, the acceleration is zero (because the velocity isn’t changing over time).

Yes, an object that was set in motion in the past by some force, but that is no longer being acted on by a net force, is moving but with zero acceleration, i.e. it is moving at constant velocity. For example, a puck sliding along a horizontal plane of ice after being hit with a hockey stick.

Explanation: If the bone does not move, then we know that the resultant acceleration on it is zero. That means that the net force must also equal zero. In other words, the sum of the two forces acting on the bone must be zero.

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. So even if the body is moving with constant velocity, it can impart its momentum to other body.

Constant velocity means that the object in motion is moving in a straight line at a constant speed. This tells us in which direction the object moves.