A pulley can do that.
A pulley can do that.
Consider velocity as consisting of a speed, and a direction. If any of the two changes - that is, if either the speed or the direction changes - then the velocity changes.
Acceleration is the rate of change of velocity over time, so velocity must always be changing if the object is accelerating. HOWEVER, you said speed which means only magnitude, not direction. If you stay the same speed, but change direction then you are accelerating. Simple answer: when you are going the same speed in a circle - velocity changes, therefore acceleration changes.
IF it changes to the completely opposite direction ... does a 180 or a "U-turn" ...then the velocity must be zero at that instant. But if the direction only changesby turning a corner or going around a bend, then there's no way to know whatthe velocity is without a lot more information.
Reverse the direction of the component.
A pulley can do that.
A pulley can do that.
Consider velocity as consisting of a speed, and a direction. If any of the two changes - that is, if either the speed or the direction changes - then the velocity changes.
An axel is a simple machine that relies on change in direction to make work easier. Furthermore, a simple machine is a device that makes work easier by increasing force or changing the direction of a force without electricity or other power sources.
No. It is possible to change direction without changing speed. However, it is not possible to change direction without changing velocity.
all physical changes are alike in which all of them changing without changing in chemical makeup of the matter we have
all physical changes are alike in which all of them changing without changing in chemical makeup of the matter we have
No, reflection means that the direction of light is changed.
Matter can undergo physical changes without changing its identity. Physical changes include melting or freezing; evaporating or condensing; changing shape; chopping or grinding into smaller pieces.
Acceleration is the rate of change of velocity over time, so velocity must always be changing if the object is accelerating. HOWEVER, you said speed which means only magnitude, not direction. If you stay the same speed, but change direction then you are accelerating. Simple answer: when you are going the same speed in a circle - velocity changes, therefore acceleration changes.
no. Energy is conserved.
A paddle brush is NOT a simple machine, a simple machine is defined as: a machine or complex tool that eases the load by changing either the magnitude of the direction of a force to match the force to the capability of the machine or the person. So, the force used is from the PERSON not the TOOL without the human force, no work, or power would result.