Chapter 3.
Why is it important that such a satellite be above Earths atmosphere?
because thats where all the signal to the tv and your phones is at.
How far below an initial straight-line path will a projectile fall in one second?
4ml
If a vector that is 1 cm long represents a velocity of 10 km/h,what velocity does a vector 2 cm long drawn to the same scale represent?
5cm
vector
An arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity.
satellite
An object that falls around Earth or some other body rather than falling into it.
projectile
Any object that moves through the air or through space, acted on only by gravity (and air resistance, if any).
Was this class easy or hard??
I think it was easy once you learn it!
resultant
The vector sum of two or more component vectors.
Suppose that an airplane normally flying at 80 km/h enccounters wind at a right angle to its forward motion, will the airplane fly faster or slower than 80 km/h?
a crosswind would increase the speed of the airplane and blow it off course by a predictable problem
What continually falls around Earth?
a satellite
What scaled so that 1 cm = 20 km/h to the right?
a vector
What has both magnitude and direction?
a vector quantity
What velocity relative to the ground depends on the airs velocity?
an air plane
How fast must a projectile moving horizontally travel so that the curve it follows matches the curve of Earth?
at a good speed rate
why does a bowling ball move without acceleration when it rolls along a bowling ally??
because its in the shape of a sphere and it doesnt have a flat surface.
At the instant a horizontally pointed cannon is fired, a cannonball held at the cannons side is released and drops to the ground.which cannonball strikes the ground first, the one fired from the cannon or the one dropped?
both cannonballs fall the same vertical distance.
how does the downward component of the motion of a projectile compare with the motion of free fall?
downward goes faster then a free fall
neglecting air resistance, if yu throw a ball straight up with a speed of 20 m/s , how fast will it be moving when you catch it ??
it will be moving faster then the speed you through it at.
A boy throws a ball a distance of 20 m. At what speed is the ball thrown?
its thrownhorizontally the distance divided by the time.
A projectile is launched at an angle into the air.Neglecting air resisteance, what is its vertical acceleration?its horizontal acceleration?
its vertical is g because the force of gravity is downward.its horizontal acceleration is zero because no horizontal force acts on it
will a vector at 45 to the horizontal be larger or smaller than its horizontal and vertical components?
larger
components
right angled vectors put together
What do we call projectile that continually "falls" around Earth?
satellites
scalar quantity
quantity that is complete described by magnitude
vector quanitity
quantity that requires both magnitude and direction for complete description
At what angle should a slingshot be oriented for maximum altitude?
right angle
How fast can a boat be rowed to reach a destination directly across a river?
slightly fast
If a superman were to throw a ball so fast that it cleared the horizontal,what will happen?
the ball would then orbit around the Earth and become an Earth satellite.
When a rectangle is constructed in order to add velocities, what represents the resultant of the When a rectangle is constructed in order to add velocities, what represents the resultant of the velocities?
the corner points of the rectangle.
When a rectangle is constructed in order to add velocities, what represents the resultant of the velocities?
the corner points of the rectangle.
What construction of the vertical and horizontal components of a vector?
the horizontal componet is 3 cm; the vertical component is 4 cm.
At what point in its path does a projectile have minimum speed?
the minimum speed of a projectile occurs at the top of its path.
resolution
the procces of determining the components of a vectoer
Why is speed classified as a scalar quantity and velocity classified as a vecto quantity?
vector quantity that requires both magnitude and direction for complete description, as scalar quantity that is complete described by magnitude
How does vector quantity differ from a scalar?
vector quantity that requires both magnitude and direction for complete description, as scalar quantity that is complete described by magnitude.
Why is speed classified as a scalar quantity and velocity classified as a vecto quantity?
vector quantity that requires both magnitude and direction for complete description, as scalar quantity that is complete described by magnitude.
What force acts on a satellite that is above Earths atmosphere?
velocity force
Does the speed change if air resistance is a factor?
yes
Place a coin at the edge of a smooth table so that it hangs over slightly.Does your answer depend on the speed of the sliding coin?
yes it does depend on the speed
