# Chapter 3: Projectile Motion

### 30 terms by MC11140

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### vector quantity

requires magnitude and direction (velocity and acceleration)

### scalar quantity

requires magnitude only (mass/speed)

### Vector

pictorial presentation of a vector quantity

shows magnitude

shows direction

hurts you

helps you

### crosswind/ current

helps you (assume perpendicular)

### parallelogram

4 sides opposite angles are parallel and congruent

1.414

use √2 rule

√2 x side

R/√2

### projectile

any object that moves through the air or through space, acted on only by gravity

### vertical component

responsible for hang time (gravity

### horizontal component

only responsible for range (air resistance

### horizontal and vertical

are independent of each other

### Fig 3.9

falling at same rate both affected by gravity

### resultant

shows magnitude and direction of projectile

### resultant

vector sum of two or more component vectors

### resolution

the process of resolving a vector into components

### Fig 3.11

at peak v is 0 and h becomes resultant and never goes slower that that

### fig 3.13

same speed at every attempt , different ranges

curves away @ 5m

### minimum speed km/s, 8000

8 km/s, 8000 m/s, 18000 mi/h (burn up)

### with satellite have to go

over 150km above earth or it will burn up

### how high

d=1/2gt(squared) (vertical)

sp= d/t (range)

d=spxt (range)

### how long

t=d/sp (range or t=√2d/g(vertical)

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