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When riding in a car you sense changes in speed and direction through the forces the car applies you. Do you wear seat belts to protect yourselves from speed or from acceleration?
Wiki User
∙ 13y ago
You wear a seat belt to protect against acceleration.
Acceleration is a change in speed over time. When you crash your speed changes over a very small amount of time. From an empirical stand point defining positive acceleration as an increase in speed over time a decrease in speed would be negative acceleration. This large negative acceleration that occurs when you crash causes large forces to be placed on the vehicle you are traveling in due to its mass. If you were to increase the time over which you crash you would have a smaller negative acceleration and thus less force would be enacted upon the vehicle. This is why cars have crumple zones. Newtons First law of motion an object in motion tends to stay in motion until acted upon by an unbalanced force.
When you are in a car traveling at 50mph your body is also traveling at 50mph. When you crash your body would continue to travel at 50moh if it were not restrained by your seat belt. and it would be the sudden negative acceleration of your body into the things around you that would cause injury to your person.
Seat padding protects you from acceleration or at least makes it more comfortable. A car can't accelerate fast enough to cause you harm. Seat belts are for catastrophic decelerations, such as a crash.
Wiki User
∙ 13y ago
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Why at a constant speed if an object changes its direction it is considered to be acceleration?
Acceleration is a direction plus a speed. If either changes then the acceleration changes.
What changes if someones speed or direction changes?
The acceleration changes if speed or direction changes
What is acceleration since it has magnitude and direction?
Acceleration is a vector quantity because it has both magnitude and direction.
Acceleration occurs when an object?
Changes direction.
Is an object going in circles at a constant speed an accelerated motion?
Yes. Acceleration is the change in velocity, and velocity is a vector, which means it has direction. Because an object undergoing uniform circular motion is changing direction, it is changing velocity, and thus, accelerating.
Why at a constant speed if an object changes its direction it is considered to be acceleration?
Acceleration is a direction plus a speed. If either changes then the acceleration changes.
What are acceleration and velocity?
'Velocity' means the rate at which position changes, and the direction in which it changes. 'Acceleration' means the rate at which velocity changes, and the direction in which it changes.
What changes if someones speed or direction changes?
The acceleration changes if speed or direction changes
What is the rate at which speed or direction changes?
Acceleration
When riding in a car we can sense changes in speed or direction through the forces the car applies on us. Do we wear seat belts in cars and airplanes to protect us from speed or from acceleration?
Acceleration
What is the deffinition of acceleration?
The rate at which speed changes, and the direction in which it changes.
What is acceleration since it has magnitude and direction?
Acceleration is a vector quantity because it has both magnitude and direction.
Acceleration occurs when an object?
Changes direction.
Is an object going in circles at a constant speed an accelerated motion?
Yes. Acceleration is the change in velocity, and velocity is a vector, which means it has direction. Because an object undergoing uniform circular motion is changing direction, it is changing velocity, and thus, accelerating.
Why is changing direction a type of accleration?
There are two parts to acceleration: direction and speed. When either of these aspects are changed, then acceleration changes.
What changes speed and direction?
Velocity is defined as a vector quantity representing both speed and direction. Acceleration is defined as the rate at which velocity changes. The acceleration of an object changes when it is acted upon by an unbalanced force.
Compare and contrast speed and acceleration?
-- "Speed" is the rate at which distance changes. -- "Velocity" is speed along with the direction of motion. -- "Acceleration" is the rate at which velocity changes, including the direction of the change.
