40 terms

Vector Quantity

A quantity in physics, such as force, that has both magnitude and direction.

Scalar Quantity

A quantity in physics, such as mass, volume, and time, that can be completely specified by its magnitude, and has no direction.

Vector

An arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity.

Resultant

The vector sum of two or more component vectors.

Component

One of the vectors, often mutually perpendicular, whose sum is resultant vector. Any resulant vector may be regarded as the combination of wo or more components.

Resolution

The process of resolving a vector into components. In optics, a measure of how well closely adjacent optical images are disinguished.

Projectiles

Any object that moves through the air or through space, acted on only by gravity (and air gravity resistance, if any).

Satellite

An object that falls around earth or some other body rather than falling into it.

free fall

when the only force acting on an object is gravity

projectile

an object in free fall is know as a

same rate

neglecting air resistance all objects fall at the _________ _______

9.8 m/s2

acceleration due to gravity (g)

zero initial velocity

drop

9.8 m/s

if you drop an object, its speed will increase ______ every second

initial velocity

throwing an object downward is just like dropping an object, only with _____ _________

upward, downward

when you throw an object up, it has _______ initial velocity and ______ acceleration

9.8 m/s

you throw a ball straight up as it rises the ball slows down by _______ each second

zero

you throw a ball straight up when it reaches the top of its path the ball's speed is...

9.8 m/s

you throw a ball straight up as it falls, the ball's speed increases by _________ each second.

9.8 m/s2 downward

you throw a ball straight up the entire time the ball's acceleration is...

same

you throw a ball straight up it takes the ball the _______ amount of time to rise as to fall

speed

you throw a ball straight up the ball returns to you hand with the same _____ it left with

down, vertical

because gravity pulls straight ______ it only affects the ____________ motion of a projectile.

stays constant

the horizontal velocity of a projectile always...

free fall

the vertical velocity of a projectile acts like an object in...

parabola

the curved path followed by a projectile under the influence of constant gravity only

time

the only thing that can cross the line of the columns of horizontal and vertical is....

zero

horizontal acceleration always because the ball is in free fall

90 degrees

to give a projectile max height launch it at an angle of...

45 degrees

when launching a projectile from level ground the angle that will result in max range is...

range

horizontal displacement

complementary angles

_____________ ________ will result in the same range

air resistance

frictional force air exerts on a moving object; acts opposite in direction to the object's motion

hang time

the total time the object is in the air

velocity

speed in a given direction

acceleration

change in velocity

displacement

distance and direction of an object's change in position from the starting point

vector

a quantity that has magnitude and direction`

scalar

magnitude only

resultant

a vector that is the sum of two or more other vectors