physical science #1

a car that is moving at constant velocity of 20m/s, east for 10 seconds has an accleration of _____m/s/s

0

The metric system of units is based on which number

10

The force of gravity of objects on the moon is approximately one sixth of their value on Earth. Joe weighs 600 N on earth. Joes mass on the moon will be approximately ___

60kg

The diagram below represent forces acting on a object. The size of the arrow represents the magnitude of the force. 10 force diagrams

A

The oil drop diagram below depicts the motion of a rightward moving object. ----- > . . . . . ..

A

mr s guides a golf ball around the outside rim of the green at the hole in one putt putt golf course. when the ball leaves the rim, which path (A,B or C) will the golf ball follow

B

The diagrams below depict the individual forces acting upon an object. Each arrow represents a force and the length of the arrow represents the size of the force.

D

Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who is correct?

Mac

an old car has a leaky engine and leaves the following oil drop trace on the street; the drops hit the street at t he regular time intervals. The oil drop pattern depicts____ -----> .. . . . . . .

an accelerated motion

the oil drops diagram below depicts the motion of a rightward moving object. which one of the force diagrams is consistent with the oil drop diagram?

b

A vector is a quantity that is fully described as by

both its magnitude and its direction

if an object has a acceleration then it MUST be____

changing its velocity

suppose that an astronaut throws a rock in outer space at a location far from significant influences of gravity and air resistance. one would expect that the rock would ____

continue in motion with the same speed and direction

the principal advantage of the metric units over english units is that

conversions between units are easier

which of the following would have an effect of decreasing the acceleration of an object

decreasing the mass of the object doubling the net force halving the mass of the object

The acceleration of an object is _____ proportional to the net force and ____ proportional to is mass

directly, inversely

which of the following quantities are scalars? select al that apply

displacement distance speed

which of the following quantities are vectors? select all that apply

displacement velocity accleration

a baseball is traveling upwards towards the peak of its trajectory and slowing down at the constant rate. The direction of the baseball's acceleration is_____

downward

if a rightward moving object experiences an unbalanced force, then the object will have acceleration which is directed to the right.

false

inertia is force that keeps stationary objects at rest and moving objects in motion at a constant velocity.

false

for the following physical situation, identify the forces that are exerted upon the object. A book is at rest upon a table.

force due to gravity normal force

grandma h challenges micheal johnson in the 400 meter dash. Grandma h spins her wheelchair wheels five times and gives up 15 meters from the starting line. MJ makes a complete circle around the track and stops at the starting line. in this race,

grandma henderson has the greatest displacement

for any given motion, displacement is

how far out of place which that object finishes relative to the starting location

an object is moving along a level surface with a constant velocity. the net force acting upon the object is

in the direction of motion zero

mass is expressed in units of _____ and weight is expressed in units of _____

kilograms, newtons

which of the following is a correct metric unit for volume

liters

a scalar is a quantity that is fully described by

magnitude alone

When all individual forces acting on an object are balanced, it is the natural tendency of an object to _____.

maintain its state of motion keep its velocity constant

the amount of matter or stuff in an object is referred to as the ___ of the object

mass

which of the following verbal descriptions best describes the oil drop pattern shown below -----> . . . . . . . . . .. ;

moves at a constant speed, decelerates to a stop, remains at rest

a car with a rightward velocity and a leftward acceleration is

moving to the right and slowing down

An object will not have any inertia if it is

nonsense! All objects have inertia

if you were in a spaceship and fired a cannonball into frictionless space, the amount of force needed to keep the cannonball in motion would be

zero, since no force is necessary to keep an object moving

an object is moving from left to right, its motion is represented by the oil diagram at the right. The object has a ______ velocity and a _______ accleleration . . . . . . . . . . .. -->

rightward, leftward

an object is moving from left to right. its motion is represented by the oil drop diagram at the right. The object has a ____ velocity and a _____ acceleration. .. . . . . . . . . ---->

rightward, rightward

identify the following quantity as being either a scalar or a vector: 50mi/hr

scalar

for any given motion, the distance is

the amount of ground which is covered by the moving object

a ball is thrown vertically upwards. After the ball is released and is moving upwards towards it peak, it slows down. during this time____

the ball is experiencing an unbalanced force; it is directed downwards

A sled slides down a hill, reaches the level surface and eventually comes to a stop. the fact that the sled ultimately stops is best explained by

the presence of an unbalanced force can cause a moving object to stop

for any given motion, the velocity is

the rate at which an object position change

A skydiver pulls the chord of his parachute. The force acting upon the skydiver and his parachute are shown in the diagram at the right. From this diagram, one might infer that ______

the skydiver will immediatley stop the skkydiver will have an acceleration that is directed upwards the skydiver will continue to fall, but now will slowdown

An object is in free fall gravity is the only force acting upon it, even if the object is rising

true

a car can be moving to the right and have a leftward acceleration.

true

an object can be moving upward and have a downward accleration

true

identify the following quantity as being a scalar or a vector: 50 mi/hr, east

vector