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Physics F4 Gravitation

Total questions: 58

Worksheet time: 58mins

Name
Class
Date
2.
The gravitational force between two massive spheres
a)
is always an attraction.
b)
depends on how massive they are.
c)
depends inversely on the square of the distances betwn them.
d)
all of the above
2.
The gravitational force between two massive spheres
a)
is always an attraction.
b)
depends on how massive they are.
c)
depends inversely on the square of the distances betwn them.
d)
all of the above
3.

Newton said that any two masses will...

a)

combine into a larger mass.

b)

attract each other.

c)

create gravitational fields.

d)

push each other apart.

4.

According to Newton's law of gravitation, the Earth and the Moon are gravitationally attracted to each other. The more massive Earth attracts the Moon with...

a)

a stronger force than the Moon attracts the Earth.

b)

a weaker force than the Moon attracts the Earth.

c)

the same force as the Moon attracts the Earth.

d)

a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

5.

Which of the following best explains why a person has less weight on top of a mountain?

a)

They are closer to space.

b)

The atmosphere is lighter.

c)

The mountain adds more mass.

d)

The mountain adds more distance.

6.

The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B?

a)

Object A

b)

Object C

c)

A and C exert an equal force on B

d)

Cannot be determined

7.

The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B?

a)

Object A

b)

Object C

c)

A and C exert an equal force on B

d)

Cannot be determined

8.

A massive object and a less massive object exert a gravitational force on each other. Which of the following picture correctly shows the magnitude and direction of the forces involved in this interaction?

a)
b)
c)
d)
9.

The gravitational force in the previous interaction was 20 N. Determine the gravitational force in the new situation where the second mass is doubled.

a)

10 N

b)

20 N

c)

40 N

d)

80 N

10.

The distance between the two masses in the previous situation is halved. Determine the gravitational force in this new situation.

a)

20 N

b)

40 N

c)

80 N

d)

160 N

11.

The picture shows two identical satellites, A and B, in circular orbits around the Earth. Upon which satellite does the Earth exert a stronger gravitational force?

a)

Satellite A

b)

Satellite B

c)

Equal on both

d)

Cannot be determined

12.

The Earth exerts a gravitational force of 12 N upon satellite B. Satellite A is twice as far away from the Earth as satellite B. Determine the gravitational force the Earth exerts on satellite A.

a)

3 N

b)

6 N

c)

12 N

d)

24 N

13.

A third identical satellite, C, is placed in orbit at half the distance from the Earth as satellite B. Determine the gravitational force the Earth exerts on satellite C.

a)

6 N

b)

12 N

c)

24 N

d)

48 N

14.

The picture shows two situations of two objects gravitationally attracting each other. What is the proportional change in the second mass of situation 2 as compared to situation 1?

a)

1/2

b)

1

c)

3

d)

6

15.

The picture shows the gravitational field in the space surrounding the Earth. What is creating this gravitational field?

a)

The gravitational force.

b)

The mass of the Earth.

c)

The distance of the Earth.

d)

The universal gravitational constant.

16.

Which of the following statements is correct with respect to G and g?

a)

G is a fundamental constant, whereas g is a physical quantity and subject to change.

b)

Both G and g can change, but g can only change if you go to a different planet.

c)

G and g are both constant, but g is determined by the mass and radius of the Earth.

d)

The strength of G is determined by g.

17.

A newly discovered exoplanet has triple the mass and double the radius as compared to Earth. What is the approximate surface gravity on this exoplanet?

a)

1.5 N/kg

b)

7.5 N/kg

c)

15 N/kg

d)

60 N/kg

18.

The picture shows two exoplanets, b and c. The mass and radius of each planet is given in terms of M and r. What is the surface gravity on planet-c if the surface gravity on planet-b is 4 m/s2?

a)

2 m/s2

b)

4 m/s2

c)

8 m/s2

d)

32 m/s2

19.
The amount of matter in an object
a)
mass
b)
weight
c)
inertia
d)
gravity
20.
What states that "every object in the universe attracts every other object"?
a)
Law of Universal Gravitation
b)
Newton's First Law of Motion
c)
My mother
d)
Inertia & gravity
21.
Which of the following is Newton's Law on Gravitation?
a)
F=Gm1m2/r
b)
F = Gm1m2/r2
c)
F = Gm1m2/2r
d)
F = m1m2/2r
22.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance 
b)
mass and matter
c)
distance and weight 
d)
weight and mass
23.
Force of gravity is directly proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
24.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
25.
If I double the distance between two objects, what happens to their gravitational Force?
a)
4x bigger
b)
4x smaller
c)
2x bigger
d)
2x smaller
26.
If I double the mass of one object, but don't change anything else... WHat happens to the gravitational force between two objects?
a)
Doubles
b)
Quadruples
c)
Cut in Half
d)
4x Smaller
27.
Two asteroids exert a gravitational force, F, on each other. Some time later, the asteroids are now three times as far from each other as before. Which of the following represents the gravitational force at this distance? 
a)
F/3
b)
F/2
c)
F/6
d)
F/9
28.

Calculate the gravitational force between two objects when they are 0.750m apart. Each object has a mass of 5.00kg.

a)

2.96x10-7N

b)

3.00x10-6N

c)

2.22x10-9N

d)

2.23x10-8N

29.
Two objects are attracted to each other with 36 N of gravitational force.
What would the force between them be if the distance between them were doubled?
a)
9
b)
18
c)
72
d)
144
30.
The law of universal gravitation is credited to whom?
a)
Einstein
b)
Galileo
c)
Darwin
d)
Newton
31.
Gravity attracts all objects towards one another.
a)
False
b)
True
c)
It depends
32.

What is the gravitational force between two identical 50,000 kg asteroids whose centers of mass are separated by 1000 m?

a)

2500 N

b)

3.3 x 10-12 N

c)

1.67 x 10-4 N

d)

1.67 x 10-7 N

33.

Two spherical objects have masses of 8000 kg and 1500 kg. Their centers are separated by a distance of 1.5 m. Find the gravitational attraction between them

a)

5.4 X 10-4 N

b)

1.2 X 107 N

c)

3.6 X 10-4 N

d)

5.33 N

34.
Complete the following statement: The farther away two planets are the _______ the gravitational force between them.
a)
more
b)
same
c)
dosen't matter
d)
less
35.

Which configuration will result in the greatest gravitational force?

a)

small masses far apart

b)

large masses far apart

c)

small masses close together

d)

large masses close together

36.
A satellite moves ______________when it is moved farther from the object that it orbits.
a)
more quickly
b)
more slowly
c)
at the same speed
d)
with no change in speed
37.

Kepler's First Law states

a)

objects attract other objects with a force that is directly proportional to the product of their masses

b)

the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

c)

An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

d)

Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

38.

Kepler's Second Law states

a)

objects attract other objects with a force that is directly proportional to the product of their masses

b)

the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

c)

An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

d)

Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

39.

Kepler's Third Law states

a)

objects attract other objects with a force that is directly proportional to the product of their masses

b)

the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

c)

An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

d)

Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

40.

As an object moves further from the surface of the Earth, what happens to its mass?

a)

The mass of the object will not vary as it moves further from the surface of the Earth

b)

The mass of the object will decrease as it moves further from the surface of the Earth.

c)

The mass of the object will increase as it moves further from the surface of the Earth.

41.

Which of the following most accurately describes the movement of the Earth around the Sun?

a)

The Earth moves at a constant speed around the Sun.

b)

The Earth moves faster when it is closest to the Sun.

c)

The Earth moves slowest when it is closest to the Sun.

d)

The Earth's speed varies dependent upon the phase of the moon.

42.

When in orbit around the Earth, what is true about the relationship between a satellite's distance from the Earth's surface and its velocity in order for the satellite to stay in its orbit?

a)

A satellite's distance and velocity are inversely proportional; that is, the satellite must travel more quickly to stay in orbit.

b)

A satellite's distance and velocity are directly proportional; that is, the satellite must travel less quickly to stay in orbit.

c)

A satellite's velocity is not affect by its distance from the Earth's surface.

d)

The distance from the Earth's surface is only dependent upon the mass of the satellite.

43.

Which of the following is the most accurate description of "escape velocity"?

a)

Escape velocity is the velocity needed to get away from the Earth's gravitational force.

b)

Escape velocity is the velocity needed to get away from the Earth's gravitational force and is dependent upon the mass of the satellite.

c)

Escape velocity is the velocity needed to get away from the Earth's gravitational force and not dependent upon the mass of the satellite.

d)

Escape velocity is the velocity needed to get away from the Earth's gravitational force and not dependent upon the mass of the satellite but is dependent upon the geometric structure of the launch vehicle.

44.
Planets orbit the Sun in a shape called a(n)
a)
circle
b)
ellipse
c)
focus
d)
perihelion
45.
Where is the planet moving faster
a)
Position A to B
b)
Position B to C
c)
Position H to I
d)
Position I to J
46.
A planet moves __________ when it is farthest from the sun.
a)
faster
b)
slower
47.
Kepler's first law states that the orbits of the planets are oval in shape or 
a)
ellipses
b)
perfect circles
48.
The farther away a planet is from the sun, the _______ it takes it to orbit the sun once. 
a)
longer
b)
shorter
49.
If a planet is closer to the sun, its orbit will be _____ than one farther away. 
a)
longer
b)
slower
c)
bigger
d)
shorter
50.
 The planet travels faster when it is closer to the sun and slower when it is farther away when it is closer to the sun and slower when it is farther away describes which of Kepler's Laws (see illustration)
a)
1st
b)
2nd
c)
3rd
d)
None of the above
51.
According to Kepler’s 3rd Law of Planetary Motion the farther a planet is located from the Sun...
a)
the shorter its period of revolution
b)
the longer its period of revolution
52.
The diagram to the left shows four positions of a planet in its orbit around the Sun. At which position would the planet’s speed be the greatest?
a)
A
b)
B
c)
C
d)
D
53.

The velocity a rocket must reach to escape from a planet or moons gravitational pull

a)

Vacuum

b)

Satellite

c)

Escape velocity

d)

Geosynchronous orbit

54.

State the definition of Gravitational field strength

a)

Gravitational force per unit time acting on a body at a point in a gravitational field

b)

The force between two bodies of mass M and m is directly proportional to the product of their masses

c)

Gravitational force per unit mass acting on a body at a point in a gravitational field

55.

what is the unit for Gravitional Field strength,  ag =GMr2a_g\ =\frac{GM}{r^2}  

a)

 N kg −1N\ kg\ ^{-1}  

b)

 J kg −1J\ kg\ ^{-1}  

c)

 m s −2m\ s\ ^{-2}  

d)

 m s −1m\ s\ ^{-1}  

56.

Newton said that any two masses will...

a)

combine into a larger mass.

b)

attract each other.

c)

create gravitational fields.

d)

push each other apart.

57.

A satelite is orbiting about the earth at the height of 45 km from the earth surface. the satelite's velocity is 7.88 ×103 ms−17.88\ \times10^{3\ }ms^{-1}  . what is the mass of earth?

a)

 6.0×1026 kg6.0\times10^{26}\ kg  

b)

 6.4 ×106 kg6.4\ \times10^{6\ }kg  

c)

 5.56 ×1026kg5.56\ \times10^{26}kg  

d)

 6.0 ×1024 kg6.0\ \times10^{24\ }kg  

58.

A satelite is at a distance,  rr  from the centre of Earth. by using Newton's Second Law of Gravitation, determine the speed,  vv  of the satelite motion

a)

 v =GMfmv\ =\frac{GMf}{m}  

b)

 v = GMmrv\ =\ \frac{GMm}{r}  

c)

 v=2π r3GMv=2\pi\ \sqrt{\frac{r^3}{GM}}  

d)

 v = GMrv\ =\ \sqrt{\frac{GM}{r}}  

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