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WorksheetsGravitational Field and Electrostatic
Total questions: 20
Worksheet time: 20mins
The time it takes a comet to complete one revolution is called the
focus
period
orbit
ellipse
If the radius of an orbit were doubled, what effect would it have on its period of orbit?
no effect
would increase
would decrease
need more information
According to Kepler's laws, the paths of the planets are
ellipses
Earth-centered
circles
parabolas
It takes Pluto a longer time to orbit the sun than the Earth does because Pluto
has much further to go
goes much slower
travels in an elliptical pattern
all of the above
The speeds of the planets about the sun depend on
their distances from the sun
the masses of the planets
their periods of rotation
none of these
At which lettered position is the planet speeding up?
A
B
C
D
E
At which lettered position does the planet have the greatest speed?
A
B
C
D
E
The direction of electric field lines shows the
direction of the force on a test positive charge
strength of the field
size of the field
all of the above
Why does a balloon stick to a wall after you rub it in your hair?
the balloon is neutral and so is the wall
The negative balloon attracts the negative electron clouds
The wall is just sticky
The negative balloon repels the electron clouds
What happens to the gravitational and electric force if you triple the distance of separation?
1/9
9
3
1/3
How does a rod become positively charged if only electrons can move?
Electrons are taken off the rod
protons are removed or added
Electrons are added
Everything must always be neutral in nature
Based on the picture. Which of the following pairs has the greatest gravitational force? Assume that Deimos and Phobos have approximately the same mass as each other.
Mars and Phobos
Mars and Deimos
Deimos and Phobos
Mars and Rainey
If Deimos and Phobos crash into Mars, what will happen to Mars’s gravity?
The gravity will increase a little.
The gravity will increase a lot.
The gravity will decrease a little.
The gravity will decrease a lot.
If the distance between Mars and Phobos is doubled, what will happen to the force of gravity between them?
The force of gravity will be ¼ as small.
The force of gravity will be ½ as small.
The force of gravity will be 2 times greater.
The force of gravity will be 4 times greater.
Why does an astronaut weigh less on Phobos than on Mars?
The force of gravity is less on Phobos’s surface than on Mars’s surface.
The astronaut has less mass on Phobos.
The astronaut is continually in free fall because Phobos orbits around Mars.
The astronaut is farther from Mars’s center when he or she is on Phobos.
Jupiter is about 300 times more massive than Earth. Jupiter’s distance from the sun is about 5 AU. Earth’s distance is 1 AU. How many times greater is the strength of the gravitational force between Jupiter and the sun compared with the gravitational force between Earth and the sun?
12 x
7500 x
1500 x
60 x
Which sentence best describes electrical conductors?
Electrical conductors have electric charges that move freely.
Electrical conductors have very few electrons.
Electrical conductors are poor heat conductors.
Electrical conductors do not carry electric charges.
What happens when two items with negative charges come close to each other?
They repel each other.
They cause an electrostatic spark.
They join together, like a perfectly inelastic collision.
They attract each other.
Use the diagram below to determine the charges of the other 3 balloons. The second balloon has a positive charge. Choose the answer that is correct about all three charges.
X = positive, Y = negative, Z = negative
X = positive, Y = positive, Z = negative
X = negative, Y = negative, Z = positive
X = negative, Y = positive, Z = positive
Which of the following is true about the gravitational force the sun exerts (pulls) on the Earth and the gravitational force the Earth exerts on the sun?
The force of Earth’s gravity on the sun is the same as the force of the sun’s gravity on Earth.
The Earth and the sun do not exert any gravitational force on one another.
The Earth exerts more gravity on the sun.
The sun exerts more gravity on Earth.
