Term
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Definition
| a unit that you get from combining fundamental units |
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Term
| What are the fundamental units of the MKS system? |
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Definition
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Term
| number of significant digits in 400,000 |
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Definition
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Term
| number of signifcant digits in 40.01 |
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Definition
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Term
| number of significant digits in .00203 |
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Definition
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Term
| number of significant digits in 1.070 |
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Definition
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Term
| when you add or subtract exponents, what has to happen? |
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Definition
| the exponents have to be the same number |
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Term
| What is the difference between precision and accuracy? |
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Definition
| precision is the degree of exactness of a measurment whereas accuracy describes how well the results of the meausrement agree with the "real" value |
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Term
| What are the three major graphical relationships and their equations? |
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Definition
| direct--y=kx; inverse--y=k/x; exponential--y=kx^2 |
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Term
| What is the difference between a scalar and a vector? examples of each. |
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Definition
| a scalar has magnitude only; a vector has magnitude and direction; scalar example is speed; vector example is velocity |
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Term
| Vectors are represented by_____. |
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Definition
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Term
| What is the difference in distance and displacement? |
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Definition
| distance is how far you go with no direction; displacement is how far you are from where you began |
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Term
| What is the difference in speed and velocity? |
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Definition
| speed is how fast you are going; velocity is how fast you are going in a particular direction |
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Term
| What is Galileo's law of falling bodies? |
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Definition
| all objects fall with the same acceleration (9.8 m/s^2) in the absence of air resistance |
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Term
| What is the value for "g" on earth? |
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Definition
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Term
| What does the slope of a d-t graph represent? |
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Definition
| velocity; the steeper the slope, the greater the velocity |
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Term
| What does a flat line on a position time graph mean? |
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Definition
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Term
| What does the slope of a velocity time graph represnet? |
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Definition
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Term
| What does a flat line on a velocity time graph mean? |
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Definition
| he going at a constant velocity |
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Term
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Definition
| interaction between two objects |
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Term
| What are the fundamental forces? |
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Definition
| electromagnetic, gravity, weak nuclear, strong nuclear |
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Term
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Definition
| the law of inertia; an object a rest will remain at rest and an object in motion will remain in motion at a constant speed in a straight line unless acted on by an outside force |
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Term
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Definition
| the law of acceleration; acceleration is directly propotional to net force and inversely proportional to mass |
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Term
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Definition
| to every action, there is an equal and opposite reaction; there are two forces and two objects |
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Term
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Definition
| the ability of an object to remain at rest or stay in motion |
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Term
| What is the difference in mass and weight? |
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Definition
| mass is a scalar and it is teh amount of matter or the amount of inertia; weight is the force of gravity, vector, downwards, measured in Newtons. |
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Term
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Definition
| anything that's tossed, thrown, or dropped in a gravitational field |
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Term
| What component stays constant during the flight of a projectile? |
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Definition
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Term
| What velocity component is affected by the acceleration of gravity? |
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Definition
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Term
| What is the first step in solving a horizontally shot projectile? |
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Definition
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Term
| If an object is thrown horizontally and another object is dropped at the same time, which object will hit first? |
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Definition
| they will hit at the same time |
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Term
| What is uniform circular motion? Is an object in uniform cicular motion accelerating? |
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Definition
| when an object is moving in a circular path at a constant speed; yes because it changes direction |
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Term
| What causes an object to follow a circular path? What is the equation? |
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Definition
| centripetal force; Fc=mv^2/r |
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Term
| What are Kepler's three laws? |
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Definition
| all planets more about the sun in ellipses; a planet speeds up as it apporaches the sun; the ration of the period squared to the radius cubed is constant |
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Term
| What is the universal law of gravitation? |
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Definition
| the force of gravity is directly proportional to the products of the masses and inversely proportional to the distance squared |
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Term
| Who determined the universal gravitational constant? |
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Definition
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Term
| What is the inverse square law? |
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Definition
| double the distance, the inverse square is 1/4 |
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Term
| If a person weighed 750 N on earth and went to a planet that was 5 times more massive and twice the radius of Earth, what would he weigh on the planet? |
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Definition
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Term
| What is rotational motion and how is it caused? |
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Definition
| motion in a circle surrounding an axis; caused by torque |
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Term
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Definition
| rotational effect caused by parallel forces |
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Term
| How do you calculate torque? |
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Definition
| T=Fl; l is the torque arm, which is the perpendicular length from the pivot point to the force |
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Term
| What determines how much rotational inertia something has? |
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Definition
| the distribution of mass; the big wheel has more rotational inertia than the small wheel |
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Term
| What is rotational inertia or moment of inertia? |
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Definition
| when an object starts rotating, it wants to kepp rotating; |
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Term
| What is the center of mass (gravity) of an object? |
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Definition
| the point at which you draw your force vector down; where the force of gravity acts |
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Term
| When will toppling occur? |
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Definition
| when the center of gravity is not over the base of support |
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Term
| What are the 2 conditions of equilibrium? |
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Definition
| translational and rotational; translational--Fup=Fdown; rotational--CW torque=CCW torque; both of these conditions must be met to be in equlibrium |
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Term
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Definition
| inertia in motion; determined by mass and velocity |
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Term
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Definition
| the amount of force and the amount of time the force is applied to an object |
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Term
| What is the law of conservation of momentum? |
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Definition
| the total momentum in a system remains constant |
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Term
| What is work? What is the unit of work? |
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Definition
| a force acting through a distance; joule (newton-meter) |
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Term
| What must be true about the force and distance for work to be done? |
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Definition
| the force must cause motion parallel to the direction of the force for work to be done |
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Term
| What is power? What is the unit of power? |
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Definition
| rate of doing work or how fast work is done; Watt |
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Term
| What is energy? What is the unit of energy? |
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Definition
| the ability to do work; joule |
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Term
| HOw do you calculate gravitation poential energy? |
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Definition
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Term
| what happens when forces are balanced? |
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Definition
| they add up to zero and will not cause a change in motion |
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Term
| what happens when forces are unbalanced? |
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Definition
| they will not add to zero and will not cause a change in motion |
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Term
| hwo do you find the direction after using the pythagorean theorem? |
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Definition
| inverse tan of opposite over adjacent then write east of south |
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Term
| Vy component is always ____. |
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Definition
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Term
| What is the universal gravitation constant (G)? |
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Definition
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Term
| what are the first steps in solving a horizontally shot projectile? |
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Definition
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Term
| If the distance between two objects is tripled, then what happens to the gravitational force between them? |
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Definition
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Term
| What happens if the mass of one object is doubled? |
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Definition
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Term
| What is the critical velocity? |
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Definition
| how fast something must be going to make it around the loop |
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Term
| What does a flat line on a distance time graph mean? |
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Definition
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Term
| What does a flat line on a velocity time graph mean? |
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Definition
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