Etkina 3.5 and Knight 3.6 (projectile motion)

Question 1

projectiles are objects launched at an … relative to a … surface

Answer 1

angle; horizontal

Question 2

the vertical component of acceleration is … due to the … force exerted on it by …

Answer 2

constant; gravitational; earth

Question 3

no object exerts a … on the system. Thus, according to …, the ball’s horizontal velocity does not … once it is released and is the same as your … of velocity

Answer 3

horizontal force; Newton’s first law; change; horizontal component

Question 4

the horizontal and vertical motions of the system object are … of one another

Answer 4

independent

Question 5

when vertical motions of two projectiles are the same, they … at the same …

Answer 5

land; time

Question 6

calculations are right only in the … or if … is …

Answer 6

absence of air resistance; air resistance; small

Question 7

a projectile is an object that moves in … under the influence of … alone

Answer 7

two dimensions; gravity

Question 8

as long as we can neglect …, any projectile will follow the same type of path

Answer 8

air resistance

Question 9

the … has no influence over the vertical motion, and vice versa

Answer 9

initial horizontal velocity

Question 10

the vertical component of acceleration for all projectile motion is the … of …, while the horizontal component is …

Answer 10

-g; free fall; 0

Question 11

the angle of the initial velocity above the horizontal is the

Answer 11

launch angle

Question 12

…: horizontal distance traveled

Answer 12

range

Question 13

maximum range when landing at the same elevation as the launch is a launch angle of …

Answer 13

45 degrees

Question 14

at … and … degrees, range is equal

Answer 14

30; 60