Show:
Vocabulary and Random
Vertical, Horizontal, Projectiles
Vectors and Theorems
Application
Wild Card
100
Define vector quantity:
What is a quantity that has magnitude and direction
100
T/F: an example of a projectile would be a ball rolling down a hill.
What is False- a projectile is an object that moves through air or space, so since the ball is rolling down on Earth's surface it cannot be a projectile.
100
What are the steps you need to include to find the parts of a vector?
What is 1. draw the vector with the magnitude and orientation. 2. Measure the sides of the rectangle. 3. draw a rectangle so the vector is the diagonal.
100
If you throw a ball up in the air to about the height of the roof at CHA and let it fall back down, and at the same time a friend drops a ball down to the ground from the roof of Cha, which ball hits first (provided they are the same mass/size).
What is Trick question-they hit at the same time.
100
T/F: the velocity of a ball at the top of it's projectile path is always entirely horizontal.
What is True
200
Define scalar quantity:
What is a quantity that has magnitude.
200
The horizontal and vertical components of projectiles are _______________ of each other.
What is independent
200
T/F: To describe the velocity of a vector, the length of the arrow is to scale and represents speed.
What is True-the direction of the arrow shows direction of the motion.
200
If a cannonball is launched horizontally (with no air resistance) at a certain speed, it will hit the ground at a speed that is _______? a. same b. greater c. lesser d. none of the above
What is a. same
200
What slows a ball down and stops it from going as far as predicted? a. gravity b. air friction c. surface tension d. viscosity
What is b. air friction
300
T/F: If a ball is thrown horizontally and also dropped from the same height at the same time, the ball thrown with force will hit the ground first.
What is False-they will hit the ground at the same time.
300
In a ___________ component of a projectile, the velocity does not change as the projectile moves (in absence of air fraction).
What is horizontal. The vertical velocity always changes.
300
What is the resultant of a 3 unit vector and a 4 unit vector at right angles to each other?
What is 5 units-use Pythagorum theorem (a2 + b2=c2)
300
If an object is thrown upward at an angle, what will be it's acceleration?
What is g=gravity downward
300
In the absence of air resistance, a ball thrown at this degree will travel the furthest.
What is 45 degrees
400
Define projectile:
What is any object that moves through air or space, acted on only by gravity.
400
When is the path of a projectile at minimum speed?
What is the top of the path
400
A motorboat is driven across a river at 2.0km/h at right angles to a current that is flowing 8 km/h. What is the resulting speed?
What is using Pythagorum Theorem (a2 + b2=c2), it would be 8.25 km/h
400
If a rock is thrown up in the air and falls back down, its acceleration when it hits the ground is __________ to when it was at the top of its path. a. the same as b. greater than c. less than d. g
What is a. the same as
400
If a plane is traveling 175 km/h and also encounters a tailwind of 30 km/h, how fast is the shadow across the ground moving?
What is 205 km/h (you add the winds together because they are going in the same direction and parallel to the ground).
500
T/F: The downward motion of a projectile launched horizontally is the same as a free fall.
What is True
500
At what other angle will a ball travel if it was thrown at a 60 degree angle?
What is 30 degrees-(because you measure the difference from 90 or a right angle). So at 75, the result would be 15 degrees.
500
An airplane whose speed is 300km/h flying parallel to the wind that has a speed of 20km/h, would result in what two possible speeds relative to the ground?
What is (you would add 20 to 300 and also subtract 20 from 300). =280km/h and 320 km/h
500
A ball thrown straight up at 15 m/s will return down with a speed of?
What is 15 m/s (given no air resistance of course)
500
T/F: when including horizontal take off, hang time will be the same as the time it takes for a jumper's feet to be off the ground vertically.
What is True-it will not change