Definitions
Free Fall
Components
Projectiles
Problems
100
This is the symbol used for a vertical distance.
What is d, y, or dy?
100
The acceleration due to gravity near the surface of the Earth.
What is 9.81 m/ss?
100
This is the shape of the path of all projectiles.
What is parabolic?
100
What is the initial vertical velocity of a horizontal projectile?
What is 0 m/s?
100
A tennis ball is bounced off the ground and takes 0.75 seconds to reach its maximum height. This is the total time it is in the air from when it left the ground until it returns to the ground.
What is 1.5 seconds?
200
This is the symbol used for the range of a projectile.
What is d, x, or dx?
200
The velocity of a projectile at the moment it is at its maximum height.
What is 0 m/s?
200
It doesn't change, this velocity stays the same.
What is horizontal velocity?
200
What is the vertical acceleration of a projectile?
What is -9.81 m/s2?
200
The initial horizontal velocity (vi in the x-direction) for a ball thrown horizontally off a cliff is 40 m/s. The ball stays in the air for 3 seconds. How far from the base of the cliff does it land?
What is 120 m?
300
This component of velocity is constant throughout the projectile's path.
What is horizontal velocity?
300
The horizontal acceleration of a projectile.
What is 0 m/s2?
300
This is the only force that acts on (a.k.a. accelerates) a projectile.
What is gravity?
300
True or False: The initial horizontal speed of an object affects the time the object spends in the air.
False
300
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontally and fires it off. The paint ball leaves the gun from a height of 3.5 m and lands on the ground 36.0 m away. How long was the ball in the air?
What is 0.84 s?
400
The acceleration due to gravity near the surface of the Earth.
What is 9.81 m/s2 ?
400
The total time an object launched upward at 4.9 m/s will have been in the air when it returns to its starting point.
What is 1.0 s?
400
Given the blue vector v, this equation is used to calculate the magnitude of the component opposite the angle θ.
What is Ay = A sinθ?
or
vy = v sinθ?
400
For a ball that’s shot at an upward angle, explain what happens to the vertical component of the initial velocity and of the acceleration throughout the flight.
What is velocity decreases then increases. Acceleration remains the same?
400
A rock is kicked horizontally off a building with an initial velocity of 40 m/s. The rock falls for 5.0 seconds. Determine the height of the building.
What is 123 m?
500
vx and vy are described as ____________ of the vector v.
what are components?
500
The maximum height an object launched upward at 4.9 m/s will reach.
What is 1.2 m?
500
Given that vx = 3.5 m/s and θ = 60°, this equation set-up would be used to calculate the magnitude of the blue vector v.
cos(60)=3.5/(v)
or similar
500
A baseball is thrown horizontally off of a cliff with an initial velocity of 80 m/s. A bowling ball is dropped from the same cliff at the same time. This ball hits the ground first.
What is both hit at the same time?
500
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontally and fires it off. The paint ball leaves the gun from a height of .75 m and lands on the ground 3.0 m away. Determine the horizontal velocity.
What is 7.7 m/s?