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Published byEmory Newman Modified over 4 years ago

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Concept Summary Batesville High School Physics

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Projectiles A projectile is an object moving in 2 dimensions under the influence of gravity. For example, a ball moving through the air is a projectile. We will ignore the effects of air resistance on the projectile (for now).

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Components of a Motion In general, any two-dimensional motion is made up of two, independent, simultaneous one-dimensional motions at right angles to each other. These are called components of the motion.

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Components of Projectile Motion The horizontal component of the motion of a projectile is motion with constant velocity. The vertical component of the motion of a projectile is motion with constant acceleration.

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An Alternative To find the position of a projectile after time t: First, find the position it would have if it had continued to move in its initial direction at constant velocity. Its position is the distance that it would free fall from rest from that point in t seconds.

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Range of a Projectile Maximum range occurs at a launch angle of 45 o. Range at angle range at angle 90 o -

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Vectors & Scalars Vector quantities have both magnitude (size) and direction in space. (velocity, acceleration, etc.) Scalar quantities have magnitude but no direction in space. (time, speed)

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Vectors & Scalars Scalars are numbers (with units) and they combine like numbers. Vectors are not numbers, and they do not combine like numbers.

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Representing Vectors Since vectors have both magnitude and direction, they are best represented by arrows. 3 m/s

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“Adding” Vectors Graphically, vectors can be added using the “parallelogram” method.

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