Projectile motions

If you are solving for the peak (height) , which would best describe the y-formula solution?

20m-10m

Two projectiles are fired at equal speeds but different angles. One is fired at angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at (neglect air resistance) ____.

30 degrees

Which angle would provide you with the largest range (distance)?

45*

The vertical velocity is ?

Changing due to gravity

The horizontal velocity is?

Constant due to the lack of gravity

When solving for the peak (height) , you should ?

Cut the time in half

If a projectile is fired horizontally, what vertical direction have we been making positive?

Down

A football is kicked into the air at an angle of 45 degrees 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 degrees with the horizontal. At the very top of the ball's path, its acceleration is _______. (Neglect the effects of air resistance.)

Entirely vertical

A bullet is fired horizontally and hits the ground in 0.5 seconds. If it had been fired with twice the speed in the same direction, it would have hit the ground in ____. (Assume no air resistance.)

0.5s

Which of the following descriptions of moving objects accurately portray a projectile? Select all that apply

A free falling object, an object upon which the only signcifcant force is the force of gravity, a falling feather in a vaccuum chamber, a falling feather in a falling vacuum chamber.

Which of the following statements are true of projectiles? List all that apply

A projectile is a free falling object, a projectile experiences negligible or no air resistance, a projectile must be accelerating in the downward direction, a projectile doesn't have to have horizontal motion, a projectile could begin its projectile motion with a downward velocity.

At what point in its path is the vertical component of the velocity (vy) of a projectile the smallest?

At the top

Gravity affects a projectiles horizontal and vertical motion

False

If a ball is thrown at an angle upwards , the vector thAt should remain the same length is?

Horizontal velocity

When a projectile is fired at an angle of 0, how is it moving at it's highest point (peak).?

It is only moving horizontally

At what point in its path is the horizontal component of the velocity (vx) of a projectile the smallest?

It is the same throughout the path

Projectile A is fired horizontally at 20 m/s and projectile B is fired at 40 m/s at an angle of 0. If they are fired at the same time , which one lands first?

Projectile A

Projectile A is fired at 20 m/s at 30* and Projectile B is fired at 40 m/s at 20*. Which projectile has a greater (faster) initial horizontal velocity ?

Projectile B

Projectile A is fired at 20 m/s at 30* and projectile B is fired at 40 m/s at 20*. Which projectile has a greater (faster) initial vertical velocity?

Projectile B

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity ___.

Remains constant

If a problem gives you an initial velocity at an angle, how should you start the solution?

Solve for the initial velocities

An object is undergoing free fall motion. As it falls, the object's ____.

Speed increases

Projectile A is fired horizontally at 20 m/s and projectile B is fired horizontally at 40 m/s. If they are fired at the same time, which one lands first.

The same time

Projectile A is fires horizontally at 20 m/s and Projectile B is dropped straight down. If they are released at the same time , which one lands first.

The same time

Which of the following statements are true of the time of flight for a projectile? List all that apply

The time that a projectile is in the air is dependent upon the vertical component of the initial velocity. C. For a projectile which lands at the same height that it is projected from, the time to rise to the peak is equal to the time to fall from its peak to the original height. D. For the same upward launch angles, projectiles will stay in the air longer if the initial velocity is increased.

Which of the following statements are true of the vertical motion of projectiles? List all that apply.

The vertical component of a projectile's velocity is changing, The vertical component of a projectile's velocity is changing at a constant rate, A projectile with an downward component of motion will have a downward component of acceleration. G. The magnitude of the vertical velocity of a projectile changes by 9.8 m/s each second. H. The vertical velocity of a projectile is 0 m/s at the peak of its trajectory. I. The vertical velocity of a projectile is unaffected by the horizontal velocity; these two components of motion are independent of each other The peak height to which a projectile rises above the launch location is dependent upon the initial vertical velocity. Consider a projectile launched from ground level at a fixed launch speed and a variable angle and landing at ground level. The vertical displacement of the projectile during the first half of its trajectory (i.e., the peak height) will always increase as the angle of launch is increased from 0 degrees to 90 degrees. Q. Consider a projectile launched from ground level at a fixed launch angle and a variable launch speed and landing at ground level. The vertical displacement of the projectile during the first half of its trajectory (i.e., the peak height) will always increase as the launch speed is increased. 5) Wh

If a projectile is fired at an angle, what vertical direction have we been making positive?

Up

If a problem does not give you any positions at all (x or y) , what formula should you use to get t?

V(fy)= Voy + at

If someone is jumping off a cliff, they would be accelerating in which direction?

Vertical

If a ball is thrown at an angle upwards, the vector that should change its direction is?

Vertical velocity

A projectile is fired vertically. How would you describe the initial velocity?

Vox = no , Voy= yes

A projectile is fired horizontally. How would you describe the initial velocity?

Vox = yes, Voy= no

A projectile is fired at an angle. How you would describe the initial velocity

Vox = yes, Voy= yes

If a problem asks you to solve for the height, y, and you are given x, what formula should you use to get t?

X= voxT

If a problem asks you to solve for the range, x, and you are given the y, what formula should you use to get t?

Y=voy T+ 1/2at^2

Which of the following statements are true of the horizontal motion of projectiles? List all that apply.

projectile with a horizontal component of motion will have a constant horizontal velocity, The horizontal velocity of a projectile is unaffected by the vertical velocity; these two components of motion are independent of each other, The horizontal displacement of a projectile is dependent upon the time of flight and the initial horizontal velocity, The final horizontal velocity of a projectile is always equal to the initial horizontal velocity, Consider a projectile launched from ground level at a fixed launch angle and a variable launch speed and landing at ground level. The horizontal displacement (i.e., the range) of the projectile will always increase as the launch speed is increased.