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Equations of Motion

Equations of Motion. 3 - Objects Projected Horizontally. Summary Notes page 5. What are we learning today?. How to explain the curved path of a projectile in terms of the force of gravity. How projectile motion can be treated as two independent motions.

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Equations of Motion

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  1. Equations of Motion 3 - Objects Projected Horizontally Summary Notes page 5.

  2. What are we learning today? • How to explain the curved path of a projectile in terms of the force of gravity. • How projectile motion can be treated as two independent motions. • How to solve numerical problems for an object projected horizontally.

  3. Projectile Motion • A projectile is an object which moves under the influence of two distinct types of motion, horizontal motion and vertical motion. • There are a variety of examples of projectiles: • an object dropped from rest • an object thrown vertically upwards • an object thrown horizontally • an object thrown upwards at an angle.

  4. Horizontal Projectiles (projectiles at an angle will be considered in the next lesson) • When an object is projected horizontally it immediately begins to fall vertically downwards under the influence of gravity. • Each type of motion acts independently of the other which causes the object to take a curved (parabolic) path.

  5. Consider the effect of each type of motion: • Horizontal - unaffected by gravity and we can ignore air resistance. The horizontal speed remains constant. • Vertical - is affected by gravity. The initial vertical speed is zero. It will accelerate at 9.8 ms-2. Use equations of motion.

  6. Activity

  7. Example A cat jumps horizontally out of a window with a speed of 5 ms-1. It takes 1.5 s to reach the ground. • State the final horizontal speed of the cat. • Calculate the final vertical speed of the cat. • Calculate the total horizontal distance travelled by the cat. • Calculate the total vertical distance travelled by the cat.

  8. Structured Problems page 10 Qs 23-29.

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