1D Motion
IF An Object Has A Constant Velocity, What Can Be Said About Its ACCELERATION
The acceleration is Zero
a man is whirling a 0.5 kg ball on a 1.0m
long string at 2 m/s. what is true about the force on the ball
it pulls in, toward the center of the circle
for a projectile, which velocity remains constant as long as air resistance is ignored?
constant velocity in horizontal direction
Formula for calculating impulse
I=FT
Calculate the kinetic energy of a 5.2 moving at 2.4m/s
13.1J
What Is The Average Acceleration Of An Object That Changes Its Velocity From 10 m/s to 30 m/s in 5 Seconds.
4m/s^2
kids were playing with balls which are equal mass. They kicked them with different forces. which one accelerated more.
Red ball - 10N, Blue Ball - 3N, Yellow ball - 5N
Red Ball since force and acceleration are directly related
A footballs kicked toward the goal. The horizontal component of velocity was 10 m/s and the vertical component was 7 m/s. What is the magnitude of the resultant velocity of the soccer ball?
12 M/S
What is an objects change in momentum equal to?
The impulse acting on the object
If an object is at rest, it certainly doesn't posses this form of energy
Kinetic Energy
What is the Relationship Between Velocity and Time For An Object moving with Constant Speed?
The graph would show a straight line at 0 along the x axis.
A child riding the merry-go-round feels a centripetal force. how would the magnitude of the acceleration change if the velocity double (2x)?
Decrease To one quarter (1/4x)
Consider a ball thrown up from the surface of the earth into the air at an angle of 30 degrees above the horizontal. Air friction is negligible. just after the ball is released, its acceleration is
Downwards at 9.8 m/s
A layer of padding is added to car dashboards because it can reduce some injuries during a collision. How does the padded dashboard make people safer
it increases the time of impact during the collision
Depends upon object mass and object height
Physical Energy
How Far Has A Ball Traveled After 3 Seconds When Thrown Downward At A Velocity 3.6 m/s
55.8 m down
ythe affect of net force and mass upon the acceleration of an object. a= Fnet/m
Newton First Law and Inertia
Any quantity that has magnitude and direction, such as displacement or velocity
What is a Vector Quantity
A Stunt person jumps from the root of a tall building but no injury occurs because the person lands on a large air filled bag . which one of the following BEST describe Why no injury occurs
The Bag provides an impulse equal to the person's change in momentum by increasing the time of impact
The sum of physical Energy and Kinetic Energy
Mechanical Energy
What is velocity?
For every action there is a equal and opposite reaction
Newtons Third Law
A physical quantity that is completely described by its magnitude
What is a Scalar quantity
Egg is dropped from a height of 1m onto the floor. Egg B is Dropped from a height of 1m into a bucket of water. which statement correctly describes why Egg B does not break
Egg B experiences less force over a longer time
Name of a singular unit of energy
Joule