Acceleration?

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Acceleration?

i always get confused with accelerations!!!! what is acceleration and what is its formula and i need help in creating a problem using the formulas and solving it!

It is junior high!

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matherapist	Best Answer In real life, you are driving a car that is going 30mph (or 44'per second). The acceleration is 0 if you maintain this speed. suppose you want to accelerate to 66' per second (45mph), so you give it some gas and reach 45mph after 11 seconds. your acceleration is (66-44)/11 or 2 feet per second^2. Acceleration is in units of distance per second^2 . Now you see an accident up ahead and you need to stop in 4 seconds. your acceleration is (0-66)/4 = -16.5' per second^2. note the minus sign indicates decceleration. A=(final vel - starting velocity)/time Posted 251 day ago ( 0 ) ( 0 ) Report Abuse

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Answers (4)

asad.taj

acceleration = velocity_{1_{-velocity_{2_{/time. It may be positive or negative.

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matherapist

In real life, you are driving a car that is going 30mph (or 44'per second). The acceleration is 0 if you maintain this speed. suppose you want to accelerate to 66' per second (45mph), so you give it some gas and reach 45mph after 11 seconds. your acceleration is (66-44)/11 or 2 feet per second^2. Acceleration is in units of distance per second^2 .
Now you see an accident up ahead and you need to stop in 4 seconds. your acceleration is (0-66)/4
= -16.5' per second^2. note the minus sign indicates decceleration.

A=(final vel - starting velocity)/time

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math_fanatic

Acceleration is the change in velocity over time. The most basic formula for acceleration can be derived from Newton's second law of motion F = MA where F is force, M is mass, and A is acceleration. Using basic algebra, A=F/M (the acceleration of an object is the force acting on it divided by its mass).

It's hard to give you a sample problem without knowing what level of physics you are doing. The physics you do in junior high is simpler than the physics you do in high school and college which can involve trigonometry and calculus.

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Doctor Bob

The first part of this entry seems to suit your question. The last part appears to be for a sophisticated course.

Columbia Encyclopedia entry: acceleration
Acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In order to produce an acceleration, a force must be applied to the body. The magnitude of the force F must be directly proportional to both the mass of the body m and the desired acceleration a, according to Newton's second law of motion, F=ma. The exact nature of the acceleration produced depends on the relative directions of the original velocity and the force. A force acting in the same direction as the velocity changes only the speed of the body. An appropriate force acting always at right angles to the velocity changes the direction of the velocity but not the speed. An example of such an accelerating force is the gravitational force exerted by a planet on a satellite moving in a circular orbit. A force may also act in the opposite direction from the original velocity. In this case the speed of the body is decreased. Such an acceleration is often referred to as a deceleration. If the acceleration is constant, as for a body falling near the earth, the following formulas may be used to compute the acceleration a of a body from knowledge of the elapsed time t, the distance s through which the body moves in that time, the initial velocity vi, and the final velocity vf:a=(vf2-vi2)/2sa=2(s-vit)/t2a=(vf-vi)/t

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