# Physics-Scalars, Vectors, and Projectiles

### 15 terms by plpsopa

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vocab from the physics chapter about 2D motion

### Scalar

a measurement without direction

### examples of scalars

50g, 100m/s, 45 lb, speed

### Vector

A measurement that includes direction

### examples of vectors

100m/s at 30° N, velocity

### Acceleration

rate of change in velocity

### velocity

rate of change in displacement

53 m/s at 67° N

(3i+4j)m

### trajectory

path the projectile follows

parabola

time

### what is a projectile?

Objects that are thrown into the air and subject to gravity

false

### in projectiles fired at an angle,

since they don't affect each other, you can split horizontal and vertical
the parabola is symmetric
g= 9.8 m/s^2 on earth
vx is constant
vy at top of trajectory is o m/s^2

### why do you get a parabola?

because x is unchanging and y is increasing

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