vector requires both magnitude and direction for a complete description while scalar is completly described by magnitude only
How does a vector quantity differ from a scalar quantity?
velocity is vector because they both contain direction as well as something else. Speed is scalar because it has nothing to do with direction, but only magnitude
why is speed classified as a scalar quantity and velocity classified as a vector quantity?
20 km/h
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?
the diagional
when a rectangle is constructed in order to add velocities, what represents the resultant of the velocity?
all of the angles are right
why do we say a rectangle is a special case of a parralleogram?
because their is a constant velocity and the ball covers equal distances in equal intervals of time
why does a bowling ball move without accelleration when it rolls along a bowling alley?
because gravity is pulling on the vertical and the horizontal remains constant
in the absence of air resistant, why does the horizontal component of velocity for a projectile remain constant while the vertical changes?
they are the same
how does the downward component of the motion of a projectile compare with the motion of free fall?
the same time
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 hits the ground first?
5 meters; no
how far below an initial straight line pathwill a projectile fall in one second? Does your answer depend on the angle of launch or on the initial speed of the projectile?
90 and 45 degrees
at what angle should a slingshot be oriented for maximum altitude? for maximum horizontal range?
20 m/s
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?
equal to; yes
neglecting air resistance, if you throw a baseball at 20 m/s to your friend who is on first base, will the catching speed be greater tha, equal to, or less than 20 m/s? Does the speed change if air resistance is a factor?
satellite
what do we call a projectile that continually “falls” around earth?
8 km/s
how fast must a projectile moving horizontally travel so that the curve it follows matches the curve of earth?
because the atmosphereic friction would burn it up if it was in the atmosphere
why is it important that such a satellite be above earth’s atmosphere?
gravity
what force acts on a satellite that is above Earth’s atmosphere?
