Midterm 2 Flashcards
What is a projectile?
any object, not in contact with the ground that is allowed to move under the influence of gravity and no other external force.
What kind of path will an object in flight on earth follow?
Parabolic
symmetrical curve
When an object is not in contact with the ground what is its horizontal acceleration?
0 m/s^2
What is the optimal angle of release for height?
90 degrees
What is the optimal angle of release for distance?
45 degrees
What does the jump mat measure?
It measures time in the air and jump height
What does the force plate measure?
Measures the time in the air and calculates initial velocity
What does the Ipod measure?
Jump time, measures the period of time when the accelerometer doesn’t measure any force
What are Kinetics?
The concepts of mass, force, and energy as they affect motion.
What is Newton’s first law?
Law of inertia: an object at rest tends to stay at rest and an object in uniform motion tends to stay in uniform motion unless acted upon by a net external force
Explain the difference between static and dynamic equilibrium.
Static equilibrium is an object at rest with a net external force of 0 acting on it.
Dynamic equilibrium is an object in uniform motion with a net external force of 0 acting on it.
What is inertia?
an objects tendency to resist change in the state of motion
what is the equation for momentum?
P = mass x velocity
What is the law of conservation of momentum?
In the absence of external forces, the total momentum of a given system is conserved (is constant)
Pbefore = Pafter
What is the coefficient of restitution and what is it used for?
it is the absolute value of the ratio of the velocity of separation to the velocity of approach.
It is a means of quantifying how elastic the collisions are.
e = (Vbf - Vaf)/(Vai - Vbi)