Science

What does heliocentric mean?

Sun is the center of the universe

action-reaction forces describe Newtons ____ law?

Third law of motion

With a constant force what will make acceleration decrease?

Unbalanced force

what would happen if the planet didn't rotate?

a day will be infinite

How often can people see a total solar eclipse?

about 2-4 years

how much of the moon and Earth can be lit by the sun at any given time?

about 50%

what causes seasonal changes in temperature on Earth?

caused by the Earth's tilt towards the sun

Why would lightning storms change the direction of ships compass needle?

compass needle will switch due to the lightning strong magnetic field.

Explain what you know about pendelum energy

contains energy of kinetic and gravitational potential energy, constant exchange between kinetic and gravitational potential energy, at highest point it has no movement as it swings downward gaining kinetic energy and losing potential until it reaches top of the swing where potential is at its highest

If the earth had twice the mass it does now, what would be the gravitational force between it and the sun?

gravitational force will be double

What force keeps all the planets orbiting around the Sun?

gravity

Why is july warmer than January?

in july the earth is facing the earth and in January the earth is not

what does rotation have to do with the length of a day?

it rotating causes the sun to gleam on one side of the Earth but not the other

a magnetic levitation train floats on a ________ force above the track and goes very fast

magnetic

what time of day would you expect to see a First Quarter Moon rise?

noon

Which material would make a good electrical insulator? What would not?

plastic,rubber, glass

A 1-kg car and a 2-kg car are both released from the top of the same hill and roll down a frictionless track. At the bottom of the hill, which car will have the greater speed? Which car will have greater kinetic energy?

the cars will have equal speeds and the 2-kg car will haave greater kinetic energy

describe the gravitational force difference of two planets with differents masses?

the force gets weaker (not completely sure)

the two sleds shown below are about to collide. If they stick together in the collsion, what will happen after the collison?

the sleds will move in the direction of the sled with more momentum

what do all planets orbit around?

the sun

Iif two magnets have like poles facing each other, they will?

they will repel each other

Given the starting conditions below what will the total momentum of both gliders after they collide?

-9.00 kg • m/s

A wire carries a current of 10 amps. A researcher finds that the strength of the induced magnetic field at a certain point is 0.50g. What will the strength of the induced field be at the same point if the current is increased to 25 amps?

1.25 G

two objects exert a gravitational force of 3 N on one another when they are 10 apart. What would that force be if the distance between the two objects were reduced to 5m?

12 N

An object of mass 1.5 kg rests on a shelf where it has a gravitational potential energy of 7 joules. An object of mass 4.5 kg is placed on the same shelf. What is the gravitational potential energy of the second object?

21 joules

Two objects exert a gravitational force on 8 N on one another. What would that force be if the mass of BOTH objects were doubled?

32 N

the gravitational potential energy of an object is calculated by multiplying its mass times gravity times its height. A 2-kg block rests on a wall that is 3 m tall. What is the gravitational potential energy of the block?

58.8 joules

Two glider with initial velocities and masses shown below hit each other in a perfectly elastic collision (elasticity 1.0) what will the velocity of glider 2 be after the collision?

6.0 m/s

Two balls collide head on a table. The first ball has a mass of 0.50 kg and an initial velocity of 12.0 m/s. The second ball has a mass of .75 kg and an initial velocity of 16.0 m/s.

6.4 m/s

Glider 1 starts with a mass of 2.4 kg and a velocity of of 3.0 m/s, what's glider 1's starting momentum

7.2 kg • m/s

How do you increase the number of snowmen destroyed by the sled sliding down the hill

All of the above

What is Newton's first law?

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

what changes when a unbalanced force acts on a moving object

An unbalanced force can cause an object to decrease or increase in acceleration.

what cause moon phase?

Earth and the sun, and the side of the moon facing toward us receives no direct sunlight

where does the shadow come from during a lunar eclipse?

Earths umbra

this magnet is activated by electric power.

Electromagnet

Inertia is described by Newton's?

First law of motion

which graph above represents the relationship between the gravitational force that two objects exert upon one another and the distance between the two objects?

Graph A

Two N-S magnets are glued to a sheet of paper. Iron fillings are sprinkled and the table is trapped several times. Which image matches what the fillings should look like?

Image A

while taking his clothes out of the dryer, charles finds a sock clinging to his sweater. What is the best explanation for this common phenomenon?

In the dryer, either the sock or the sweater gained electrons while the other item lost electrons.

which objects will be strongly attached to a magnert? What objects are not?

Metals are strongly attached to magnets (besides copper, gold, silver)

According to Newton's second law of motion what is the relationship between mass and acceleration ?

More mass an object has, more force is necessary for it to accelerate

What might cause a car parked roll backwards on a hill?

Newton's first law of motion

Object in motion will ____until acted upon by another force

Object in motion will stay constant until acted upon by another force

Balanced forces are always opposite in ?

Opposite direction