SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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For a falling object.
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When acceleration is constant.
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When velocity is changing by a constant amount.
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When acceleration is changing.
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Detailed explanation-1: -The SUVAT equations from equations of motion can only be used when an object is moving with constant acceleration. When the acceleration varies, this is when we must use calculus. The diagram above shows the relationship between acceleration a, velocity v and displacement x .
Detailed explanation-2: -The equations of motion, also known as SUVAT equations, are used when acceleration, a, is constant. They are known as SUVAT equations because they contain the following variables: s-distance, u-initial velocity, v-velocity at time t, a-acceleration and t-time.
Detailed explanation-3: -The “suvat” Equations Acceleration is the rate of change of velocity of an object. where a is acceleration, v is the final velocity of the object, u is the initial velocity of the object and t is the time that has elapsed. This equation can be rearranged to give: v = u + at.
Detailed explanation-4: -Since the kinematic formulas are only accurate if the acceleration is constant during the time interval considered, we have to be careful to not use them when the acceleration is changing.
Detailed explanation-5: -The SUVAT equations are used when acceleration is constant and velocity is changing. If speed is constant, you can use the speed, distance and time triangle. They can be used to work out initial and final speed, time, dispacement and acceleration, if at least three quantities are known.