Unit 1 Acceleration & Projectile Motion Flashcards
A football is kicked into the air with a speed of 75m/s at an angle of 45 with the horizontal. At the top of it’s path the vertical velocity is?
0m/s
A football is kicked into the air with a speed of 75m/s at an angle of 45° with the horizontal at the top of the ball’s path it’s acceleration is?
9.81m/s2 (down)
Referring to the diagram explain what is happening to the VERTICAL velocity of the projectile
Decreases
Decreases
Zero
Increases
Increases
Referring to the diagram explain what is happening to the HORIZONTAL velocity of the projectile
Stays the same the whole time
A projectile is launched at an angle of 15° above the horizontal and lands downrange. for the same speed what other projection angle would produce the same down range distance?
75°
Two projectiles are fired at equal speeds but different angles. one is fired at angle of 30° and the other at 60°. what projectile will be the first to hit the ground.
30°
Is the motion along a parabola symmetrical?
Yes
A football is kicked into the air at an angle of 45° with the horizontal. at the very top of the ball’s path its velocity is
entirely horizontal
A football is kicked into the air at an angle of 45° with the horizontal at the very top of the ball’s path it’s acceleration is
entirely vertical
Roll a bowling ball off the edge of a table as it falls its horizontal component of velocity
stays the same
how many dimensions does a projectile move in
2
True/False
Projectiles are objects being acted upon by gravity alone as such there’s a vertical acceleration but no horizontal acceleration the horizontal velocity of a projectile is either 0 or constant non-zero value
True
True/False
For any two-dimensional motion perpendicular components of the motion are independent of each other
True
True/False
Time is different on the X and Y axis
False
True/False
For horizontally launched projectiles the initial velocity on the y-axis will be equal to the final velocity
False
The equation: d=vit+1/2at uses which axis
y-axis
How to find the range of a projectile (Horizontal displacement)
d=V(x) X T
How to determine the velocity right before an object strikes the ground
Vf=Vi+at then solve the triangle with a2+b2=c2 then use tangent to find the angle
How to find the horizontal and vertical components of the velocity
Vx=Vcos0
Vy=Vsin0
How to find the peak height
Vf2=Vi2+2ad
Finding d
