Chapter 3 Flashcards
A dropped object increases by how much each second
9.8 ms
An object thrown straight upward and at its max height has what velocity
Zero speed but changing direction
When an on object si thrown vertically upward its accelerating either the way up or the way down
Both
When a ball is thrown upward what are its velocity and acceleration at its highest point
Zero for velocity bc then it changes direction and comes back down and 9.8 for acceleration because of gravity and constant
A person drops a stone from the window of a building one second layer she drops another stone how does the distance between the stones vary with time
It gets bigger bc the distance continues to increase and it projectile sigh no air resistance just gravity acting on it
A baseball player hits a foul ball straight up into the aior and leaves the bat with a speed of 120 kmh in the absence of aid resistance how fast will the ball be traveling when the Cather catches it
120 kmh bc of symmetry
As freely falling object speed up what is happening to its acceleration due to gravity does it increase decrees or stay the same
Stay the same
Which one of these motions is not a constant acceleration a rock falling from a cliff an elevator moving from the second floor to the fifth floor making stops along turn way a dish resting on a table
The elevator bc it is accelerating and decelerating
Can an object have zero velocity and nonzero acceleration at the same time
Yea is the acceleration is constant in the absence of air resistance bc of the gravitational pull, any thing in its Max height
Is an airplane projectile motion
No
Is a tennis ball lobbed over a net projectile
Yes
Is a plastic disk sailing across a lawn projectile
No
Is a hawk diving to catch a mouse projectile
Yes
Is a parachute drifting to the earth projectile
No
Is a frog jumping from land to water
Yes
Is a flat rock skipping scored the surface of a lake parabolic motion
Yes
Is a three point shot in basketball parabolic
Yes
Is a space shuttle while orbiting earth parabolic
Yes
Is a ball bouncing across a room parabolic
Yes
Is a cliff diver parabolic
Yes
Is a life preserver dropped form a stationary helicopter parabolic
No
A bullet is fired horizontally from pistol and another bullet is dropped simultaneously from the same height if air resistance is negligent whcih bullet hits the go ground first
Teh same because of constant acceleration
If a rock is dropped from the top of a sailboats mast will it hit the deck at the same point whether the boat is at rest or in motion. At constant velocity
Yes because of the constant velocity where the horizontal keeps up with teh boat bc of the constant velocity and teh Horixontal motion has no effect on gravity
What is a projectile
An object in free fall where only gravity affect it and has horizontal .a component of motion
Describe the path followed on air by any projectile
A parabola or part of a parabola
What’s it eh relationship between the Horixontal ,motion and vertical motion of a projectile
No relationship independent of each other change one mad the other one isn’t affects
What is the acceleration of a projectile in the air
9.8
Horizontally is the velocity constant
Yes
At a maximin height of a projectile what is the vertical acceleration and what is the Horixontal accerlarion
Vertical 9.8 and horizontal zero
In archery should the arrow be aimed directly at the target how should your angle depend on the distance to teh target
No above bc gravity the net,e changes with distance it travels
If two balls fall from the same height and one dropped and the other thrown horizontally at a speed of vx which ball will hit the ball first, which one will go further, and compRe teh speed of each ball when they hit the or young
They will hit the ground first because they both have a constant acceleration for same time and same height, b will go further bc it is is the horizontal distance plus the vertical distance, b is faster bc has vertical and horizontal distance added together
When an object is thrown upward what is the difference between the speed returning to the starting point and the initial speed
Same
