Physics

Kinematics

012

An object moving in a circular path at constant speed will have a non-zero average speed and zero average velocity since velocity is a vector parameter,

Yes. it is possible to have average speed (even average velocity as vector, <v> ) to be zero. But the velocity in a given time is not zero. A famous example is electron in magnetic field. It has velocity but orbiting (classically), however it's average position is the same (quantum mechanically), so the electron stays there and do not go anywhere (no current).

It is not possible because the average velocity is equal to the displacement in a given time interval, ie: V = (displacement) / (time interval) As the zero displacement average speed will also be zero.

Yes - for example, if an object moves in a circle.

Yes, if it returns to its starting place, the average velocity for the cycle will be zero. The average SPEED, however, will not be zero.

Since speed is a scalar quantity, the only way the average speed can be zero is if the instantaneous speed is at all times zero, making it not a moving body, so no on the average speed. The average velocity, on the other hand, can easily be zero. The simplest example is you running in a circle.

No because velocity defined as speed in a given direction so if speed is 0 then velocity must also be 0

No, it can't. Average VELOCITY can be zero, though.

For example, an object goes in a circle, at a speed of 50 km/hour. The average speed is 50 km/hour; the average velocity is zero.

Sounds like a trick question. The answer is no. Speed is a scalar with magnitude only and velocity is a vector with magnitude (speed) and direction. So If traveling with velocity in a straight line it has speed..

No. If the speed is always zero, then the average of its speed at any two points in time is also zero.

Yes it is possible. If a body goes round a circular path then distance covered by one full rotation will be 2 pi r But the total displacement is 0. Hence the average speed exists but average velocity does not exist.

Yes this is possible, when the velocity is constant. When velocity is constant there is no change in velocity, if there is no change in velocity then is no acceraltion. e.g. : a car traveling at a constant speed of 40m/s

Average velocity is zero if the displacement is zero. Average velocity = Displacement/Time = 0/Time = 0.

Speed is the magnitude of distance travelled per unit time, whereas velocity depends on the magnitude of distance travelled as well as the direction of motion. Speed is a scalar quantity, velocity is a vector. Speed cannot be negative, velocity can be negative. Average speed of an object after travelling a certain distance is always non-zero, but for velocity the average velocity can be zero (this follows from the previous idea).

Yes, since velocity is speed and direction its average can be zero. For example say a plane flies from point A to point B at 300 mph and turns around to go from B to A at 300 mph; its average velocity is 0 since it is in the same spot as it started ( the velocity vectors cancel) but its average speed is 300 mph.

No. Acceleration is the change of velocity. If velocity is constant, at any speed, acceleration is zero.

Speed is distance by time and velocity is displacement by time. If an object is moving with speed distance can never be zero but displacement can. So we say velocity can be zero.

It's not. If you speed is constant (but not zero), then your velocity won't be zero, either.You may be confusing this with the following: If your VELOCITY (not your speed) is constant, then your ACCELERATION is zero. Acceleration refers to how quickly velocity changes, so if velocity doesn't change at all, acceleration is zero.

Velocity can only be positive. Even when you are going backwards, your speed is still above zero. There is no way to get to a number below zero when you are talking about velocity. ====================================== Sorry. Speed (the magnitude of velocity) can't be negative, but velocity can. If it couldn't, then two velocities could never add up to zero, which is always possible with vectors.

Their average speed is the harmonic mean of 30 and 45 while their average velocity is zero.

Zero relative velocity to another object, sure no problem. Zero absolute velocity, not possible as there is no absolute reference to compare to.

The average velocity in a particular direction = distance travelled in that direction / time taken. Velocity is a vector so the direction is important. If I go from A to B and then return to A my average velocity will be zero. My speed, on the other hand, will not be zero.

When an object is not moving. (Velocity is speed)

If the average velocity of an object is zero is the average speed zero? no Velocity is a vector. Drive 50 mph east for 2 hours and then turn around and drive 50 mph west for 2 hours. 50 mph east is + 50, and 50 mph west is -50. Average velocity = (+50 + - 50) ÷ 2 = 0 Speed is not a vector, it has no + or - sign. 50mph east is the same as 50 mph west. Average speed = 50 mph Displacement = distance from beginning point to final point Average velocity = displacement ÷ time = 0 miles ÷ 4 hr = 0mph Distance = length of path traveled ÷ time Average Speed = distance ÷ time = 200mi ÷ 4 hrs = 50mph

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