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Difference between negative and positive acceration?
Positive acceleration ==> speeding up Negative acceleration ==> slowing down
What is the acceleration if someone walks at 5 kilometers an hour for 2 hours?
If the person has not been speeding up or slowing down, his acceleration is 0 km/s/s.
What is the acceleration of a car that moves at a steady velocity of 100 kmh for 100 seconds Explain your answer and state why this question is an exercise in careful reading as well as in physics?
Acceleration = 0 because the car is moving at a STEADY velocity. It is neither speeding up, nor slowing down.
If speed is zero then is acceleration zero?
There are only 3 ways to accelerate: speeding up, slowing down, and changing direction. since 0mph allows you to do none of those three things, it can't be accelerating.
What must cause acceleration when a car is moving a constant speed and why?
Acceleration is scientifically defined as a change in velocity, not an increase in speed. Thus slowing down, speeding up, or changing direction are all forms of accelerating. If one is moving at a constant speed, then the only way to accelerate would be to change direction.
