Helen spits a spit wad from her bed to her ceiling. It takes .3 seconds for it to hit the ceiling. What was the initial velocity of her spit wad?
v= -30 m/s
100
True or False:
Motion is relative.
True
100
Is there always an equal and opposite reaction for every action?
Yes this is the Law of action and reaction.
100
What is the change in the kinetic energy of an object if you lift it at a constant speed?
The change in kinetic energy is 0.
200
What is an object doing if it has an accelerating motion?
The object has an increasing velocity.
200
Bob stands at the top of a 200m cliff. He drops his water bottle off the cliff. How long will it take for Bob's water bottle to hit the ground?
t= 6.3seconds
200
Is there any initial vertical velocity on a horizontally launched projectile?
No there is not.
200
The acceleration of an object is directly proportional to the net force and _______ proportional to the mass.
Inversely, this is the law of force and acceleration.
200
True or False:
If you enact work to an object it will not undergo a change in speed nor a change in kinetic energy.
False.
300
What does the acceleration graph look like if the displacement is positive and constant?
The acceleration is 0 and constant.
300
Helen spits a spit wad from her bed to her ceiling. It takes .3 seconds for it to hit the ceiling. How high is Helen's ceiling from her bed?
y= 15m
300
On a vertically launched projectile is an object begins and ends at ground level what is the horizontal displacement?
The horizontal displacement is 0.
300
True or False:
An object in motion will remain in motion unless an outside force acts upon it.
True, this is the law of inertia.
300
Can energy be created or destroyed?
No only transformed, this is the Law of conservation of mechanical energy.
400
What is the kinematic equation that doesn't use time?
Kinematic #3v^2= vo^2+2ax
400
A t-shirt is fired upward from a t-shirt gun into the air with a speed of 30m/s and comes undone 5 seconds later. How high up did the t-shirt climb before coming undone?
y= 25m
400
A dare devil jumps off of a cliff with an initial velocity of 20m/s and and initial y velocity of 0m/s. If the cliff is 15ft high how long does it take him to reach the ground?
T=.75 seconds
400
There is a 6 kg object sitting on a slope at an angle of 25 degrees with a mu of .24. What is the acceleration of the object?
a=2.05m/s/s
400
True or False:
Potential energy is stored energy.
True.
500
What replaces acceleration when finding the y displacement?
Gravity replaces it.
500
Clarissa is jumping on a trampoline. She jumps straight up into the air and falls back to the same spot on the trampoline in 2.4 seconds. How high did Clarissa jump?
y= 28.8m
500
A soccer player kicks a soccer ball with a velocity of 20m/s at an angle of 45 degrees. How far away does the soccer ball land?
x=20.36m
500
A car has two equal masses pulling on it, both with pulleys. Is the car at a constant speed?
Yes it must be at a constant speed.
500
What does the work while an object is flying in the air?