Science Ch. 3 Test

If an object is placed two earth radii above the surface of the earth, then the force of gravitational attraction between the object and the earth will be one-fourth the magnitude as on earth's surface.

False

The acceleration of gravity experienced by objects located near to (and far from) the earth depends on the mass of the object.

False

The doubling of the separation distance (measured from center) between two objects will halve the gravitational force between the objects.

False

The gravitational force between two objects is independent of the mass of the smaller of the two objects.

False

The gravitational force can ALWAYS be accurately calculated by multiplying the object's mass by the acceleration of gravity (m*g)

False

The gravitational force only acts between very, very massive objects.

False

Increasing mass of an object will increase the acceleration of gravity experienced by the object.

False- Independent of mass of object

If the mass of the Earth were doubled and the radius of the Earth doubled, then the two changed would offset each other and the acceleration of gravity on its surface would still be approximately 10 m/s.

False.

In general, the directions of lurch and acceleration, and therefore the directions of lurch and force are the same, not related, opposite?

Opposite

You continue driving, and round a sharp curve to the left at a constant speed. your body leans inward, outward, not at all?

Outward

Newton's universal gravitation equation gives the force that the earth exerts on a nearby apple or a far away moon. Why is this formula such a milestone in the intellectual history of humankind?

The first law that applies to not just earth, but the universe.

Doubling the distance between an object and earth's center will decrease the acceleration of gravity by a factor of four.

True

If object A gravitationally attracts object B with a force of X Newtons, then Object B will also gravitationally attract object A with the same force of X Newtons.

True

If the mass of the Earth were doubled (without alteration in its radius) then the acceleration of gravity on its surface would be approximately 20 m/s.

True

The acceleration of an orbiting satellite is equal to the acceleration of gravity at that particular location.

True

The acceleration of gravity experienced by objects near to and far from the earth depends on the mass of the earth

True

The acceleration of gravity experienced by objects near to and far from the earth inversely related to the distance between the center of the object and the center of the earth.

True

The gravitational force acting upon an object is the same as the weight of the object.

True

The gravitational force between an object and earth is inversely (squarely) related to the distance between the object's and earth's center.

True

what is the equation for centripetal acceleration in terms of v and and r?

a=v^2/r

You're driving along and approach a stop sign. The driver steps on the brakes. the car accelerates forward, backward, not at all?

backward

You're driving along and approach a stop sign. The driver steps on the brakes. the force on the car acts forward, backward, not at all?

backward

You're in a car at a traffic light. The light turns green and the driver "steps on the gas". Your body lurches forward, backward, not at all?

backward

The whirling stone's direction keeps changing. If it moves faster, it's direction changes faster or slower?

faster

in which direction will force, acceleration and velocity be in accordance with each other when being affected by a centripetal force?

force and acceleration point in the same direction inwards and velocity is perpendicular to force and acceleration, tangent to the circular route

You're driving along and approach a stop sign. The driver steps on the brakes. your body lurches forward, backward, not at all?

forward

You're in a car at a traffic light. The light turns green and the driver "steps on the gas". the car accelerates forward, backward, not at all?

forward

You're in a car at a traffic light. The light turns green and the driver "steps on the gas". the force on the car acts forward, backward, not at all?

forward

a car makes a sharp right-hand turn along a level roadway-what is the centripetal force?

friction

the moon orbits the earth-what is the centripetal force?

gravity

The whirling stone's direction keeps changing. This indicates that as speed increases, acceleration increases, decreases or stays the same?

increases

consider whirling a stone on a shorter string- that is, of smaller radius This indicates that as the radius decreases, acceleration increases, decreases, or stays the same?

increases

You continue driving, and round a sharp curve to the left at a constant speed. the direction of the car's acceleration is inward, outward, not at all?

inward

You continue driving, and round a sharp curve to the left at a constant speed. the force on the car acts inwards, outwards, not at all?

inward

what does the word "universal" mean in this context?

it applies to all objects (including outside of earth)

consider whirling a stone on a shorter string- that is, of smaller radius for a given speed, the rate that the stone changes direction is more, less, or the same?

more

what is the equation for mu in terms of v, r and g?

mu=v^2/rg

a roller coaster car passes through a loop-what is the centripetal force?

normal

an eraser is tied to a string and swung in a horizontal circle-what is the centripetal force?

tension

an apple falls to the ground. what about the moon?

the moon falls OVER THE SIDE OF THE EARTH

for any given planet, the speed is greatest when the planet is closest to the sun

true

satellites travel faster along their orbital path when they are closest to the earth

true