What is the vertical (y) velocity at the top of a projectile's trajectory?
zero!
100
The horizontal and vertical components of velocity are ______________ from one another
Independent
100
If a tennis ball takes 4.5 seconds to reach its peak, how long will it take to travel its entire trajectory?
9 seconds
100
A boat traveling 10 m/s west encounters a current traveling 3.5 m/s north. What is the boat's resulting magnitude of velocity?
10.6 m/s
100
If a bullet is shot out of a gun at the same time another bullet is dropped from the same height, which one lands first?
They land at the same time!
200
If a ball is thrown straight up with a velocity of 5.8 m/s, what will its velocity be when it returns to its original position?
-5.8 m/s
200
Which component of velocity stays the same in projectile motion?
The horizontal component
200
What is the only force that acts on a projectile during its motion?
Gravity
200
A rock is thrown off a cliff horizontally at 10 m/s. If the cliff is 108 m high, what is the rock's horizontal displacement?
47 m
200
At what part of its trajectory does the projectile experience minimum speed?
At its peak
300
How can you find the vector components of the initial velocity of an object if you are given the magnitude of velocity and an angle?
vy = v sin (angle)
vx = v cos (angle)
300
Gravity only affects which component of velocity?
The vertical component
300
What is the shape a projectile makes?
A parabola
300
A monkey throws a banana horizontally off a 15 m tall tree. The banana lands 8 m away from the tree. What was the initial velocity of the banana?
4.6 m/s
300
What direction is acceleration in projectile motion?
Down
400
How can you find the direction of the velocity vector on a projectile's trajectory at any given point?
The velocity vector is tangent to the curve of the trajectory.
400
Which variable do the horizontal and vertical motions have in common?
time
400
What is the best angle to shoot a projectile to get the furthest range?
45 degrees
400
A stone is thrown outward from the top of a 70 m high cliff with an upward (vertical) velocity of 20 m/s. How long is the stone in the air?
6.3 seconds
400
How does an object's mass affect its motion as a projectile?
Mass has no effect
500
At the peak of a projectile's trajectory, which components is the velocity vector made up of?
Only the horizontal
500
What is the only equation that works in the horizontal direction?
v = x/t
500
At what other angle will a thrown ball go the same distance as one thrown at 38 degrees?
52 degrees
500
A large cannon is fired from ground level at an angle of 20 degrees above the horizontal. The muzzle speed is 950 m/s. How far will the cannon ball travel before striking the ground?
59.2 km
500
Explain where and how a package dropped from a plane lands with respect to the moving plane
The package lands under the moving plane since its horizontal velocity remains constant.