Speed measures how fast an object is moving, whereas acceleration is how much the speed of an object changes during a specified period of time. If an object is speeding up, it has a positive acceleration, whereas an object slowing down has a negative acceleration.
Know MoreTo calculate the speed of an object, the distance traveled is divided by the time taken to travel that distance. If an object is gaining or losing speed, it is said to be accelerating.
Speed, unlike acceleration, cannot be negative. This is because speed is a scalar quantity, which means it does not include the direction an object is moving. Acceleration is a vector quantity, which means it shows how fast an object is changing speed and the direction in which the speed is changing.
Acceleration is calculated by finding the change in speed over a period of time, and then dividing this change by the time taken. If an object has a constant acceleration, it is speeding up by the same amount over a set period of time.
For example, if a car that is stationary speeds up to 10 mph in five seconds, the change in speed is 10 mph. The acceleration is found by dividing this number by five seconds, giving a value of 2 mph squared.
Learn more about Motion & MechanicsWhen the acceleration of an object is zero and the velocity is positive, the object continues to move at a steady velocity in the same direction. The object cannot be changing direction because direction change results in non-zero acceleration.
Full Answer >G-force is an attractive force caused by the acceleration due to gravity on one object by another object. Positive g-force increases the apparent weight of a body while negative g-force decreases the apparent weight of a body.
Full Answer >When an object reaches its terminal velocity, it can no longer accelerate, so its acceleration becomes zero, and it falls at a constant speed. As an object falls freely through the air, it has two forces acting upon it: gravity and drag.
Full Answer >The speed of an object is equal to the distance traveled divided by the time taken to travel that distance. The faster an object is moving, the further it moves in the same amount of time.
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