velocity problem (physics buff needed)?

Question

Can velocity ever be zero while acceleration is not zero?
2. Can velocity be constant while speed varies?
3. Can velocity reverse direction while accleration is constant?
4. Can speed increase while acceleration decreases?

If you could help me in answering these questions it would be of great help to me
thanks

and please elaborate on your answers
thanks again

holy ****, I go to the same hs as you used to, hhs! thats crazy!

Answer 1

1) Yes...Just as you are reversing velocity is zero but you are accelerating.
2) No...The inverse is possible...Think orbit.
3) Yes...Throw a ball directly up in the air.
4) Yes... Even though acceleration is decreasing, if it is still positive thus an increase in velocity/speed.

Answer 2

1) Velocity can be zero when something is accelerating, for example, if you throw a ball straight up in the air. At the top of the balls path it will have a velocity of 0 but will still be accelerating.
2) The difference between velocity and speed is that velocity includes a direction so the no.
3) Yes, as the example above with the ball, but you would have to accelerate the ball at the same speed as gravity for it to work as you asked.
4) No

Answer 3

(1) Rate of change of velocity is acceleration. Therefore when velocity is zero, acceleration is also zero. Even when an object is thrown straight up, at the highest point, velocity goes to zero and acceleration changes from -9.8m/sec2 to 9.8m/sec 2 but goes through 0 acceleration for an instantaneous time.

(2), the difference between velocity and speed is that, velocity is a vector quantity whereas speed is a scalar. When velocity changes, the speed will change.

(3) Velocity cannot reverse direction without changing the acceleration. This is because, acceleration is rate of change of velocity.

(4) Speed cannot decrease while acceleration decreases, since rate of change of velocity is acceleration and rate of change of displacement is velocity, acceleration is the second derivative of displacement with time.

Answer 4

When I was in High School, Physics was my favorite subject, and not just because we got to go to Cedar Point (a theme park in Ohio) for our Final. It's good stuff. Let me see if I can help.

Velocity can not be defined without speed because velocity is really just somethings speed in a given direction so by saying that a car is driving 70 mph we are given speed, but saying a car is driving 70 mph due north, we've just given its velocity

Velocity can easily be zero while acceleration is not zero. If someone is jumping back and forth between two points they are increasing speed forward and backward but keep returning to the same point and therefore have no velocity.

Velocity can not be constant while speed varies because as I stated earlier velocity is simply an objects speed in a given direction, the velocity would change with the speed.

If an object is moving at an acceleration on 9.8 mph in one direction and starts to turn without changing its acceleration than it has changed velocity without changing acceleration.

The speed of a given object will continue to accelerate until the acceleration rate has reached zero. So, if an object is accelerating at 10 mph, it will increase speed at the lesser rates until it reaches zero acceleration.


Hope this helped and keep at the physics, its good stuff!!

Answer 5

1. If velocity is zero then there is no acceleration so you can never have a value of acceleration when there is zero velocity.

2. Speed is the magnitude of velocity so speed can only be a positive value while velocity can be negative or positive, but they will never have different scalar values. (eg. velocity might be -3m/s and speed will be 3m/s and never anything different).

3 and 4. If velocity and acceleration have different signs, that means the object is slowing down. If they have the same sign, then the object is speeding up.

Answer 6

look up the kinematic equations. There are 4 of them that handle extraordinarily much each and all the pronblems you're in all risk to get. Then p.c.. the single that includes the documents you comprehend and what you may locate. you are able to could algebraically exchange the equation to isolate the element you want. generally "down" is seen unfavorable and "up" is seen beneficial. notwithstanding it would not quite remember - you are able to desire to call the speed UP unfavorable and then the acceleration by way of gravity may be beneficial, even while the ball is coming down (stepping into the different direction to which it began). you basically could be consistent approximately direction.