Introduction to Projectile Motions

projectile motion

Objectives

• define projectile motion

• describe the properties of projectile motion

• solve problems involving projectile motion

Multiple Choice

What is the horizontal acceleration of a projectile?

• 0 m/s²

• 9.8 m/s²

• -9.8 m/s²

• 4.9 m/s²

Multiple Choice

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

An object is projected horizontally from a cliff. The time it takes to hit the ground is

• more than if it was just dropped

• less than if it was just dropped

• the same amount of time than if it was just dropped

• impossible to determine

Multiple Choice

If I throw a crayon straight up at 12m/s, how fast is its speed when i catch it at the same height?

• 6 m/s

• 12 m/s

• 18 m/s

• 24 m/s

What is projectile motion?

• motion in two or three dimension

• motion through air or space, acted on only by gravity (and or air resistance, if any)

What are the components of projectile motion?

• along horizontal component, motion is uniform motion and there no acceleration along horizontal

• along vertical component, it is commonly known as the free fall, and it is acted upon by gravity only

projectile calculations

types of projectile motion

• projectile launched horizontally

• projectile launched at an angle

projectile launched horizontally

• the projectile travels the same horizontal distance in equal times between each flash

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projectile launched at an angle

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projectile launched at an angle

especial case, launched on top at an angle

projectile motion kinematic equations

1. Find the time of flight of the cannonball.

2. What is the magnitude of velocity just before it strikes the ground?

An object is thrown horizontally.

1. Find the time of flight of the object.

2. How far from the edge of the cliff will the object be?

How will you describe the magnitude of velocities in vertical as it goes up approaching peak point and as it start to go down. How about the horizontal velocity?