Projectile motion
Brandon launches a projectile at an angle of 75 degrees above the horizontal, which strikes the ground a certain distance down range. For what other angle of launch at the same speed would the projectile land just as far away?
15 degrees
The hang time of a basketball player who jumps a vertical distance of 2 feet is 2/3 of a second. What will be the hang time of the player reaches the same height while jumping a horizontal distance of 4 feet
2/3 second
If a vector that's 1 cm long represents a velocity of 10km/h, what velocity does a vector 2 cm long drawn to the same scale represent
20 km/h
Neglecting air resistance, if you throw a ball straight up with a speed of 20 m/s, how fast will it be moving when you catch it
20 m/s
How far below an initial straight line path will a projectile fall in one second
4.9 m
A projectile is launched vertically at 50 m/s. If air resistance can be neglected, at what speed will it return to its initial level? Where in its trajectory will it have minimum speed?
50 m/s and at the top
How did a vector quantity differ from a scalar quantity
A vector quantity deals with both magnitude and direction while a scaler quantity desks with magnitude
Does your answer depend on the angle of launch or on the initial speed of the projectile?
Angle because 1/2at2
In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes
Because of gravity
Your driving behind a car and wish to pass, so you turn to the left and pull into the passing lane without changing speed. Why does the distance increase between you and the car you're following
Because when you switch lane your no longer going one speed, one direction, rather just 1 speed
Will a vector at 45 degrees to the horizontal be larger or smaller that it's horizontal and vertical components? By how much?
Bigger (a2+b2=c2)
When you jump up, your hang time is the time your feet are off the ground. Does hang time depend on your vertical component of velocity when you jump, your horizontal component of velocity, or both? Defend your answer.
Both because the x and y axis are completely independent so the air resistance is underneath you in both axis's
When air resistance acts on a projectile, does it affect the horizontal component of velocity, the vertical component of velocity, or both? Defend your answer.
Both because there is air on both the x and y axis
At the instant a ball is thrown horizontally over a level range, a ball held at the side of the first is released and drops to the ground. If air resistance is neglected, which ball strikes the ground first
Both land at the same time
Why is speed classified as a scalar quantity and velocity classified as a vector quantity
Both vector and velocity includes one speed one direction, while both scalar and speed both just include magnitude
Two vectors at right angles that add up to a given vector
Components
Neglecting air resistance, if you throw a baseball at 29 m/s to your friend who is on first base, will the catching speed be greater, less, or equal to 20 m/s
Equal
An airplane encounters wind that blows in a perpendicular direction to the direction its nose is pointing. Does the effect of this wind increase or decrease speed across the ground below? Or does it have no effect on ground speed?
Increases ground speed
The speed of falling rain is the same 10 m above the ground as it's just before it hits the ground. What does this tell you about whether or not the rain encounters air resistance
It does encounter air resistance
A batted baseball follows a parabolic path on a day when the sun is directly overhead. How does the speed of the ball's shadow across the field compare with the ball's horizontal component of velocity
It's the same because both the ball and the shadow are moving together
Marshal says that when a pair of vectors are right angles to each other, the magnitude of their resultant is greater than the magnitude of their resultant is greater than the magnitude of either vector alone. Renee says he is speaking in generalities and that what he says isn't always true. With whom do you agree?
Marshal: hypotenuse is always the biggest side of a triangle
Why does a bowling ball move without acceleration when it rolls along a bowling alley
No net force
Christopher can paddle a canoe in still water at 8 km/h. How successful will he be at canoeing upstream in a river that flows at 8 km/h
Not successful, wouldn't be moving
What two formulas should we know
Pothagoreum therium Law of signs
Anything unsupported in gravity
Projectile
Whenever you add 3 and 4, the result is 7. This is true if the quantities being added are scalar quantities. If 3 and 4 are the magnitudes of vector quantities, when will the magnitude of their sum be 5
Pythagorean
Process of determining the components of a vector
Resolution
How does the downward component of the motion of a projectile compare with the motion of free fall
Same at 9.8 m/s2
What do we call a projectile that continually "falls" around the earth
Satellite
Numbers, unit
Scalers
Rain falling vertically will make vertical streaks on a cars window. However, if the car is moving, the streaks are slanted. If the streaks from a vertically falling rain make 45 degree streaks, how fast is the car moving compared with the speed of the falling rain
The car has to be moving at the same speed of the rain drops
When a rectangle is constructed in order to add perpendicular velocities, what part of the rectangle represents the resultant factor
The diagonal line
How does the vertical distance a projectile falls below an otherwise straight-line path compare with the vertical distance it would fall from rest in the same time
They both fall in the y-axis because of gravity
How is the horizontal component of velocity for a projectile affected by the vertical component
They're both independent
Velocity formula
V=d/t
Number, unit, direction
Vectors
Does speed change if air resistance is a factor
Yes, it slows down