# Physics 101 Test 2

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nukudaba's
version from
2015-10-02 13:00

## Section

Question | Answer |
---|---|

Average Acceleration - define - equation - units | The rate of change in velocity during a set amt of time - (a = ΔVelocity / Δtime) - m/s^2 |

Average Speed - Define - equation - units | Rate of speed over a period of time - (s = distance / time) - m/s |

Average Velocity - Define - equation - units | Change in displacement over a set amount of time - (v = Δdisplacement / Δtime) - m/s |

Displacement - Define - equation - units | Straight Line distance from a starting point - Δx = x(f) - f(i) - m |

Instantaneous Speed - Define - units | Average Speed at a given second - m/s |

Acceleration - define - equation | change in velocity in a tiny interval - (Δv/Δt) |

Magnitude - Define - EX | Size of a vector Qty - Speed is the magnitude of the velocity |

Vector - Define | A QTY with a magnitude AND a direction |

Velocity - Define | A vector quantity with a speed and a direction |

A roller coaster has _ average velocity because _ | Zero - it returns to the SAME point |

Rate of acceleration due to gravity = | 9.8 m/s^2 |

Acceleration - Define - units | Rate at which velocity changes - m/s^2 |

Instantaneous Velocity - Define - Units | Average Velocity at a given second - m/s |

_ is as important as speed | Direction |

Speeding up (terms of acceleration) | Acceleration and velocity in SAME direction |

Slowing down (terms of acceleration) | Acceleration and velocity in OPPOSITE directions |

Speed is a _ and NOT a _ | magnitude - Vector |

mph/s is a unit of _ | Acceleration |

Amt of acceleration at a CONSTANT speed = _ | Zero |

Constant Acceleration - Define | Speed changes by SAME amount every second |

Kinematics - Define | Describes the motion of objects |

Weight equation | (mass)(acceleration due to gravity) OR (m)(g) |

Gravity accelerates to the _ of the earth | Center |

Force - Define | Push or pull on a body |

weightlessness is also called _ | Free fall |

Weight and mass are the Same thing - t OR f | False |

Normal force - Define - Direction of force - Unit | Force exerted on a body by a SURFACE - Perpendicular to the Surface and pointing UP Newton (N) |

Tension - Define - Direction of force - Unit | Pulling force exerted by a cable and pointing opposite - Along cable - Newtons (N) |

Static Friction - Define - Direction of force - | Force EQUAL in SIZE and OPPOSITE in direction to applied force |

Kinetic Friction - Define - Direction of force - Unit | Resistance force between a body and a surface While IN MOTION - Pointing Towards the object that is moving. Placed opposite the direction of motion - Newtons (N) |

Applied force - Define - Direction - Units | Force applied by person - in direction of movement (behind body) - Newton (N) |

Newtons 1st law of Motion | Every body continues its state of rest OR uniform speed in a stright line AS LONG AS no net forces act upon it |

Newtons 2nd law of Motion | The acceleration of an object is DIRECTLY proportional to the NET FORCES acting on it AND is INVERSELY proportional to it mass |

Newtons 2nd motion law equation | acceleration = net forces / mass OR a=Σf/m |

F(net) Equation | Forces(net) = (mass) (acceleration) OR F(net) = (m) (a) |

Newtons 3rd law of Motion | For every action there s an equal and OPPOSITE reaction |

Uniform Circular Motion - define | the motion of an object in a circle at a CONSTANT SPEED.While in circular movement its velocity is CONSTANTLY CHANGING |

Centripetal Force | A force which keeps a body moving with a UNIFORM SPEED along a circular path and is directed along the radius towards the center |

In a constant circular motion the is a _ change of velocity | CONSTANT |

Centrifugal Force - Define | Force pulling an object AWAY from the center of a circle |

Centripetal Acceleration - Define - Equation - Units | The acceleration that is directed TOWARD the center of the circle - centripetal accel. = (body's speed)^2 / radius of circle OR a(c) = v^2 / r - m/s^2 |

Total acceleration in a Circular Motion - equation | total accel. = (centripetal accel.) + (tangent accel) |

Tangential Acceleration - Define - Equation | Accel. component causes a change in the speed (v) of the particle - tan. accel. = ABS(Derivative speed / derivative time) |

Derivative - Simple Definition | Change in magnitude of a force |

AN object moving on a FLAT surface with a CONSTANT speed has _ f(net) | Zero |

F(net) equation is measured in N because _ | The equation is concerned with the amt. of INERTIA in an object |

1 N = | Force needed to accelerate 1 kg of mass 1 m/s^2 - (kg)(m/s^2) |

f(net) ALWAYS point in _ direction as acceleration | Same |

Tension forces drawn AWAY from object being _ | pulled |

Static friction is _ than kinetic friction | BIGGER |

Kinetic friction has _ value independent of the speed of the object | Constant |

Even breaking is_ friction and E-breaking is _ friction | static - kinetic |

Why does a frog not fall into the earth? | The downward force of the frogs weight (N) is EQUAL to the normal forces exerted from the floor going up |

Explain Jumping through newtons 3rd law of motion | You exert a downward applied force and the NORMAL force of the floor exerts a force that propels you upward. |

Why is recoil from a gun not as strong as the firing bullet? | Inertia, the gun has more to the same fore propels the bullet while only slightly moving the gun |

All forces occur in _ that are equal and _ | Pairs - Opposite |

(Newtons 3rd law) YOU exert a downward force on the floor and the FLOOR exerts an equal force on you. Do these forces cancel each other out? | NO, these forces are equal according to the law BUT they DO NOT have a net force of 0 because they are acting on DIFFERENT objects. Crazy...... |

A race car gets its centripetal force from the _ between the tires and the floor | Friction |

Subtracting Vectors - equation | Δv = v(f) - v(i) |

When adding vectors you can NOT change the _ or the _ of the original | Size (magnitude) - direction |

Length of a vector is its _ | Magnitude |

the initial and final vector are drawn _ to _ | heel - heel |

Velocity is in direction of motion and acceleration can point _ or _ the direction of motion | Towards - against |

When a ball rolling UP a hill are its velocity and acceleration in opposite directions until it starts to move in the opposite direction | Yes, the acceleration only changes direction once it STARTS to move again |

(T or F) as a ball first rolls up a hill and then backwards down the hill, the direction of the acceleration is pointing DOWN the hill | True, the velocity changes but the acceleration is pointing the same direction the whole time |

Is centripetal force a net force? | Yes |

(T or F) in a uniform circular motion and at a constant speed, the normal force IS the centripetal force | True |

Do you show centrifugal or centripetal force on a FBD? | No, you only show F(normal) f(gravitational) and f(normal). in a sense f(normal) is the centripetal and the other two make up the centrigugal |

What determines the speed of a ball being spun on a string? | The tension |

Projectile motion - Define | A moving object with an initial velocity and near earths surface with ONLY the force of gravity acting on it |

Projectile motion is in the shape of a _ equation | Parabola |

Which falls faster, a bullet fired from a gun or a ball dropped from the same height? | They fall at the SAME rate |

Translation Motion - define | Motion along a path ( ball flying through air) |

Rotational Motion - Define | Object spinning around its center of mass (ball spinning while flying through air) |

Center of mass - define | The Point in an object that it will rotate around in a translation of motion |

Do transnational and rotational motions affect each other? | NO |

(T or F) In a 3D motion, The laws for each dimensional motion apply to each dimension separately | True |

An object moving in a circular motion, at a constant speed must have a _ acting on it | f(net) |

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