| A | B |
|---|
| to ticket a driver a police must measure | instantaneous speed |
| on a position time graph the magnitude represents | objects speed |
| Vector quantities | 9.8 ms down, 100 mi north, 61 mihr west |
| porsches accelerates from 0-60 in 4 sec, acceleration is | 15 mi/hr/s |
| car slows down from 32-8 in 4 sec. Acceleration is | -6 |
| an obj. w an acceleration of 10 ms will | change its velocity by 10 ms in 1 s |
| the slope of the lines on a velocity time graph rep. | the acceleration |
| an obj. is accelerating if its moving | with changing speed |
| identify all accelerating units | mi/hr/s, m/s/hr, m/s^2 |
| constant acceleration means that | velocity is changing by the same ammount |
| a car w a leftward velocit and rightward accelration is | moving to the left and slowing down |
| a care w a leftward velocity and leftward acceleration is | moving to the left and speeding up |
| the standard metric unit of mass | kilogram |
| standard metric unit of force | newton |
| forces when unbalanced always cause objects to | accelerate |
| forced when balanced always cause moving objects to | keep same speed and direction |
| which would have the effect of decreasing the acceleration of an obj | increasing mass and decreasing net force |
| the net force of an obj w constant velocity | 0 N |
| if an obj is at equilibrium then | forces are balanced and net force is 0 |
| inertia refers to | objects to remain at rest and obj in motion stay in motion |
| which types of forces act upon a falling skydiver | air resistance and gravity |
| a persons mass would be the ___ on the moon | same |
| amount of force required to keep 6 kg obj moving w const velocity | nonsense |
| force of gravity that acts on an object refries to the ___ of an obj | weight |
| what is happening to the speed of a skydiver the 1st min | increases |
| what i happening to acceleration of skydiver 1st min | decreases |
| object experiences tenson force when | its being pulled by string |
| object experiences normal force when | in contact w another object |
| the direction of normal force is | always perpendicular to the plane |
| if the net force is doubled then the acceleration | is doubled |
| if the mass is doubled then acceleration | is halved |
| which friction has the greets force | static |
| the diff between a vector and scalar is that a vector | has magnitude and direction |
| when 2 or more vectors are added the sums is | the resultant |
| the acceleration of a football is | downwards only |
| the magnitude of horizontal velocity of a tennis ball wil | remain constant |
| the magnitude of vertical velocity of tennis ball will | decrease |
| the velocity of the boat is | 4.30 |
| the direction of the boat is | 54.4 degrees s of w |
| the gravitational force acting on the skier is directed | straight downward |
| the normal force acting upon the skier is directed | perpendicular to the slope |
| the friction force acting on the skier is directed | parallel to the slope |
| an obj moving in a circle, what direction is the velocity vector | tangent to the circular path |
| an obj moving in a circle, what s the direction of the acceleration vector | towards the center of the circle |
| what describes the direction of the net force vector | outwards |
| the sensation of an outward push is explained by | the riders tendency to go in a straight line, but barrel is curved |
| a centrifugal force is | a false force that we make up to go straight |
| what is always true of accelerating obj | changing their velocity |
| keplers 1st law states that | planets orbit the sun in elliptical orbits |
| keplers 2nd law states that a line connecting a planet and sun | sweep out the same amount in any 2 periods |
| keplers 3rd law states the ratio of | the period squared to the radius cubed is the same |
| the force of gravitation attraction is directly proprtiona to | the product of the objects masses |
| the fore of grav. attraction is inversely proportional | to the square of the separation distance |
| earth were 2 as massive, the strength would | be double th size |
| earth were 4 times as massive the strength | would be quadruple the size |
| earth had 2 the radius but same mass, the strength | would be 1/4 the size |
| newton per kilogram is a unit of | acceleration and grav. field |
| the plot force v time demonstrates | the force acting on the baseball changes its value over time |
| how does the impulse of a cather and pitcher compare | the impulse are equal |
| it is safe to move hand w ball bc makes | collision time greater and force less |
| during this explosion the momentum change is | same for cart a and b |
| during this explosion the velocity change is | 3 times greater for cart b |
| which case does the car experience greets momentum change | case a |
| in which case does the car experience greatest impulse | case a |
| the impulse encounters by 800 kg car has magnitude | of 7200 |
| t/f upsetting god of physics | true |
| t/f acceleration can have - value | true |
| t/f the force of the ball will decrease over time | false |
| t/f the weight is not related to mass | false |
| t/f only moving obj encounter frictional force | false |
| t/f an obj moving in a circle at constant speed is accelerating | true |
| t/f objects that move in a circle have an acceleration of 0 | false |
| t/f if the earths mass were changed then acceleration would change | true |
| t/f obj a is 1/10 the mass of b, therefore couldn't have a greater momentum | false |
| t/f momentum is a vector quantity | true |
