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Physics Midterm
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Gravity
Terms in this set (33)
False
A quantity that had only magnitude is called a vector
True
The vector sum is called the resultant
True
The length of a vector represents its magnitude
False
A quantity that has both magnitude and direction is called a scalar
True
The orientation of a vector shows its direction
False
When adding 2 vectors at right angles, the resultant of the vectors is the algebraic sum of the 2 vectors
False
A single vector can be replaced by 2 vectors in the X and Y directions that are at right angles to each other. These 2 X and Y vectors are called the resultant of the original vectors.
False
A ball will go the farthest of thrown horizontally
False
Mass is a vector quantity
True
Wind velocity can be represented as a vector quantity
Magnitude and direction
A vector is a quantity that has...
Magnitude
A scalar is a is a quantity that has...
-the length of the arrow is drawn to a suitable scale
-the length of the arrow represents the speed
-the direction of the arrow shows the direction of motion
(All of the above)
When representing velocity as a vector...
At the top of its path.
At what part of a path does a projectile have minimum speed?
1g downward
An object is dropped and falls freely to the ground with an acceleration of 1g. If it is thrown up at an angle instead, it's acceleration would be....
60 degrees
A ball is hurdled into the air at an angle of 30 degrees above the horizontal and lands on a target that is at the same level as where the ball started. The ball will also land on the target if it's at an angle of...
100 m down range
A cannonball is launched horizontally from a tower. If the cannon has a barrel velocity of 100 m/s, where will the cannon ball be 1s later? (Ignore air resistance)
The same as if it's at the top of its path
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, it's acceleration is...
Always false
In the absence of air friction the vertical component of a projectiles velocity change as the projectile moves.
Always true
In the absence of air friction the horizontal component of a projectiles velocity doesn't change as the projectile moves
Neither--they both hit the ground at the same time
At the instant a ball is thrown horizontally with a large force an identical ball is dropped from the same height which ball hits the ground first?
Entirely horizontal
A ball is thrown into the air at some angle. At the very top of the balls path its velocity is
45degrees
In the absence of air resistance the angle at which a thrown ball will go the farthest is
Air friction slows the ball
A ball thrown in the air will never go as far as physics ideally would predict because
More
An airplane flying into a head wind loses ground speed and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind then ground speed is
5units
What is the resultant of a 4 unit vector and a 3unit vector at right angles to each other
Simply a projectile
When in orbit a satellite like the space shuttle is
It would orbit earth
If you could throw a baseball horizontally at a speed of 8km/s and if there were no air drag and nothing to stop it
240km/h
Suppose a small plane can fly 200km/h relative to the surrounding air. Suppose also that there is a 40km/h tailwind how fast does the planes shadow move across the ground
Neither they hit the ground at the sane
At the instant a ball is thrown horizontally with a large force and identical ball is dropped from the same height. Which ball hits the ground first
10m
A cannonball is fired at some angle into the air. In the first second it moves 10 meters horizontally. Assuming it doesn't hit the ground and air resistance is small how far does it move horizontally in the next second?
45degrees
In the absence of air resistance the angle at which a thrown ball will go the farthest is
20m/s
A ball is thrown straight upward at 20m/s. Ideally the ball will return to the throwers hasn't with a speed of
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