Physics, 19.08.2019 13:30 yailin9562

Is it possible for an object that has a constant negative acceleration to change the direction in which it is moving.

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It is possible.

Consider an object that is moving forward. If it gets a constant negative acceleration, then its speed will decrease. When it becomes negative, the object will move backwards : it will have changed its direction.

Answer from: swaggaming941

Of course ! If you call "up" the "positive" direction, then that's exactly
what happens every time you toss a stone or a ball up into the air.

The stone or the ball starts out with upward (positive) velocity. But the
acceleration of gravity is downward (negative). The effect on the ball is
that its positive velocity becomes smaller and smaller, eventually reaches
zero, and then becomes negative when the ball or the stone starts moving
downward.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

friction

explanation:

they us to move forward and backwards

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