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Answered 2011-02-04 02:30:39

No on acceleration and yes on velocity

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When velocity may change?

Velocity can only change if the object experiences an acceleration. Acceleration can only change if either the Force on the object increases, or the Mass of the object decreases.

Only one force acts on an object Can the object have zero acceleration and zero velocity?

It is not possible for acceleration to have zero acceleration because the force acting on the object is gravity and g=9.8m/s squared. Gravity is the acceleration It can however have a zero velocity

Three things that can be acceleration?

Only one thing can be acceleration; the changing velocity of any given object. That's what acceleration is. Acceleration is caused by a net force on the object.

Is forces always result in motion?

No. Only a NET FORCE can result in an acceleration, and thus change the velocity of an object.

What can cause the velocity of an object to change?

Acceleration is a change in the speed of an object (contrary to popular belief - acceleration ban be an increase or decrease in speed). Velocity of an object only changes when acted on by an external force like a push, friction or other force. Objects in motion stay in motion until acted on by an external force

What is the acceleration of gravity?

That means that an object that is ONLY subject to the force of gravity, and to no other force, will accelerate downwards - its velocity will change over time.

How is friction a force?

Due to friction velocity of a body gets reduced, reduction in velocity causes change in velocity. This change in velocity leads to production of acceleration.(Because only acceleration can produce change in velocity either its direction or its magnitiude). And only a force can cause the acceleration hence friction is a force.

A force that acts on an object does what only when the object moves?

A force will produce acceleration when the object moves. force in the line of motion will increase the acceleration and the force opposite to the line of motion will decrease the acceleration.

Is the acceleration due to gravity always pointing vertically downward even for an object whose velocity is vertically upward?

Acceleration only depends on the direction of the applied force and is independent of the velocity of the object, so gravity is always pointing down.

How can you find velocity from only force and mass?

You would need to use the equation f=ma In this equation, f means force, m means mass, and a means acceleration. So dividing the force by the mass will give you a figure for acceleration. If you know how long the object has been accelerating for, or how far, and what the initial velocity was (or whether it started off still) then you can work out the velocity from this acceleration.

How do you find velocity with no acceleration or time?

Velocity can only be identified by acceleration or time, even though we can also find it using force

How can the forces on a moving object be balanced?

Forces on a moving object are balanced only when the object is moving at a constant velocity. Remember, acceleration is a force and a constant velocity is equivalent to zero acceleration. Think of a ping pong ball that you drop from a few meters above the ground: After a short acceleration the ball reaches "terminal velocity" when the air resistance balances the gravitational acceleration. After this, the forces on the ball are balanced (although it is moving, the velocity - speed & direction - of the ball is not changing)

Why is the body moving with a uniform velocity is zero?

The body is not zero, but the sum of all forces on it is. -- "Uniform velocity" means no acceleration. -- Acceleration is force/mass . -- If acceleration is zero, that's an indication that force must be zero.

Is acceleration only when an object speeds up?

No. Acceleration is simply the change in velocity, or the change in speed, whichever way want to think about it. If the object is slowing down, it has a negative acceleration. If it is speeding up, it has a positive acceleration. If it is at a constant speed/velocity, it has zero acceleration.

Which are considered vectors?

I only know three: Velocity,Acceleration, and Force

Any time the speed of an object increases the object undergoes?

For an object's speed to change (increase or decrease), the object must be accelerating. If there is an acceleration, there is a non-zero net force acting on the object.note: Velocity and speed are different. An object's velocity can change without the speed changing. Example of this is centripetal acceleration. The object's velocity changes directions, thus the velocity changes. The magnitude (or speed), however, stays the same (if only a radial acceleration is present).

What is the velocity of an object if the net force on the object is zero?

You can't tell. The only thing you can say is that as long as the net force onan object is zero, the velocity is constant. We don't know what that velocityis, but it doesn't matter. Whatever it is, it remains constant. Contrary to oureveryday experience on Earth, no force is required to keep something moving.By the way, that also means that the object's acceleration is zero when thenet force on it is zero.

Before the 17th century what ideas did people have concerning motion velocity and acceleration?

There were many different ideas, but they all went something like this: Most people thought that the natural state of an object was at rest, and that force needed to be applied in order to keep an object moving at constant velocity. Of course, we now know that no force is needed for constant velocity, only acceleration.

What is the velocity of an object accelerating at 3 meter per second per second with a force of 12N?

We can only give the mass of the object. Newton's second law of motion will show that Force = mass x acceleration. therefore 12 Newtons = 4 kilogrammes x 3 m/s2 To calculate final velocity you will need to specify the time, the acceleration (and the initial velocity).

What happens to the velocity when an object is accelerated?

A moving object being accelerated will show a change in its velocity (it may move faster, or slower, or experience a change in direction). A stationary object will respond to acceleration only if there is no other force acting to prevent its response. For example: gravity is a constant force of acceleration, but objects cannot move toward the center of the earth if they are being blocked by another object.

What do you call it when an objects velocity changes?

A change in an objects velocity is called acceleration. Velocity is defined as an objects speed of travel AND its direction of travel. Acceleration can change only an objects speed, only its direction or both. If there is no acceleration acting on the object, then the velocity remains constant.

Is it true or false that acceleration can only occur when the speed of an object changes?

No. Acceleration is change of velocity. It occurs when an object changes speed and/or direction.

Can two directions of velocity of an object change when acceleration is constant?

An object can have only one velocity at any point in time. That velocity can have components in two (or more) directions.If acceleration is constant (but non-zero), then the velocity in any direction other than perpendicular to the direction of the acceleration must change.

How do you apply newtons first and second laws to explain why an object moving in a circular path at a constant speed is undergoing acceleration and has a force exerted on it?

-- "Velocity" is defined as the description of the direction an object is moving and its speed in that direction.If either or both of those items is changing, then the velocity is changing. Any change in velocity is definedas "acceleration".-- An object with no force acting on it moves in a straight line. The only way to cause it to deviate fromstraight-line motion is with force. An object that's not moving in a straight line must be experiencing aforce. If it were not, then it could only move in a straight line.

Why would on object that weighs 294 newtons on earth weigh only 50 newtons on the moon?

Because mass and force are related to the acceleration* of the body on which the object rests. Earth's acceleration at or near the surface is 9.807 meters per second squared. The moon's acceleration is about only 1.62 meters per second squared, thus the difference in mass and force. * Acceleration is the rate at which the velocity of an object changes over time.

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