Download Fall Semester Review

FALL SEMESTER REVIEW
KINEMATICS—both graphs and equations of motion
Fundamental Units: You need to know what they are for length, mass,
time and how to convert to them within the Metric System
Distance vs. Displacement: Know the difference and how to determine
Velocity vs. Acceleration: Know the different and how to determine
Precision vs. Accuracy: Be able to define both and know what they
mean
Slopes and Areas of graphs:
FORCES
Newton’s 1st Law: an object with no (net) force on it moves with constant velocity.
Newton’s 2nd Law: F=ma
Newton’s 3rd Law: When one object exerts a force on a second object, the second exerts
a force on the first that is equal in magnitude but opposite in direction.
There are all kinds of Forces, Gravitational force is the weakest. It is responsible for an average
acceleration of -9.8m/s2 on the earth. Direction of acceleration of object in free fall is downward.
Direction of the force of Gravity is always downward.
Fg = mg
Inertia: be able to define and determine what object has more of it
Free body diagrams:
You should be able to determine the direction
and cause of each force.
You should be able to determine the magnitude
and direction of the net force.
You should be able to determine the magnitude
and direction of the acceleration.
You should know what Equilibrium means and
what it looks like.
MOTION IN 2-D
Projectiles: Realize that the Vertical and horizontal velocities are independent.
Something that drops and something that is launched horizontally take the same
amount of time to fall.
Symmetrical nature of problem, something will take the same amount of time to
come down as to go up. An object has zero velocity at the top. The acceleration
due to gravity is always pulling down in the vertical direction only. There is no
horizontal acceleration.
Centripetal Motion: You need to know the Force and
acceleration directions. Know how to use the formulas.
Weightlessness and centripetal Force: Know how satellites
work.
Universal Gravitation: Know the concepts behind how two
large bodies are attracted to each other and how to calculate the
force of attraction, period and velocity.
Statics: Forces in two dimensions that are not in motion.
Dynamics: Force in two dimensions that are in motion.
Torque: A force applied perpendicular to a distance to the pivot
point will produce rotation.
MOMENTUM AND ITS CONSERVATION
Impulse Momentum Theorem: F∆t = m∆v and what does it mean? Where does it come from?
Law of conservation of momentum: Define it and understand how to use it.
You need to know why conservation of Momentum problems only happen in closed, isolated systems.
Know the difference between Internal and external forces and how they affect your collision problems.
You need to be able to make and interpret diagrams of collisions and write equations to match them.
ENERGY
Work formula: W=Fd
Know that Work is the transfer of energy (W= ∆E). An object that has energy has the ability to produce
a change, or to do work.
Law of Conservation of Energy: The total amount of energy in a closed isolated system is constant.
Kinetic energy is the energy of motion. It’s based solely on mass and velocity.
Potential energy is stored energy.
The total energy is the sum of the potential energy and the kinetic energy.
Gravitational potential energy reflects an object’s position on earth: The closer to earth the less the PE.
Know the difference between Elastic and Inelastic collisions.
Know that Machines do work for you but work input will never be less than work output. Machines
either change the magnitude or the direction of the Force.
Power is work over time and measured in watts.
Know the difference between Mechanical Advantage and Ideal Mechanical Advantage.