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Gravitational field

Total questions: 20

Worksheet time: 16mins

Name
Class
Date
1.
The definition of gravitational field strength is:
a)
The region of space surrounding a body where other bodies will feel an attractive force due to it.
b)
The region of space surrounding a body where other bodies will feel an repulsive force due to it.
c)
The region of space surrounding a charge where other charges will feel an attractive force due to it.
d)
The region of space surrounding a charge where other charges will feel an repulsive force due to it.
2.
Gravitational potential at a point is....
a)
the work done in bringing a unit mass from infinity to the point
b)
the work done in bringing a unit mass from the point to infinity
c)
the work done in bringing a unit charge from infinity to the point
d)
the work done in bringing a unit mass from twice the radius of the mass to the point
3.
The closer together the gravitational field lines.....
a)
the weaker the gravitational field strength
b)
the stronger the gravitational field strength
c)
the more repulsive the gravitational field strength
4.
Gravitational field strength is measured in:
a)
N
b)
J/kg
c)
m/s
d)
N/kg
5.

Saturn has a surface field strength of 10.4 N kg−1 and a radius of 6.03 × 104 km. What is the mass of Saturn?

a)

4.7 × 1018 kg

b)

5.7 × 1020 kg

c)

4.7 × 1024 kg

d)

5.7 × 1026 kg

6.
A force of attraction between objects that is due to their masses.
a)
Force
b)
Gravity
c)
Gravitational Pull
d)
Weight
7.

In Fields, The constant of proportionality, G, is called the

a)

gravitational field strength

b)

universal constant of gravitation

c)

Gibb's free energy

d)

acceleration due to gravity

8.

The value of G is

a)

6.67x10−116.67x10^{-11}

b)

6.67x10116.67x10^{11}

c)

6.67x10−16.67x10^{-1}

d)

6.67x1016.67x10^1

9.

The gravitational field strength outside a uniform sphere of mass Mis the same as that of a point mass Mat the centre of the sphere. The Earth, which may be assumed to be spherical and of radius r, has a gravitational field strength g at its surface. Which expression gives the gravitational field strength at height h above the ground?

a)

g r2 / (r + h)2

b)

g r / r + h

c)

g (r- h) / r

d)

g (r-h)2 / r2

10.

Which equation shows the gravitational potential, V?

a)

V = − G Mr2V\ =\ -\ \frac{G\ M}{r^2}

b)

V = − G MrV\ =\ -\ \frac{G\ M}{r}

c)

V = G Mr2V\ =\ \frac{G\ M}{r^2}

d)

V =  G MrV\ =\ \ \frac{G\ M}{r}

11.

Consider a body of mass m which needs to be moved from an orbit of radius 2R to 3R. What is the energy required

a)

GMm/R

b)

GMm/R2

c)

GMm/6R2

d)

GMm/6R

12.

Mars has a diameter approximately 0.5 that of the Earth, and a mass of 0.1 that of the Earth.

The gravitational potential at the Earth’s surface is −63 MJ kg–1.

What is the approximate value of the gravitational potential at the surface of Mars?

a)

−13 MJ kg–1

b)

−25 MJ kg–1

c)

−95 MJ kg–1

d)

−320 MJ kg–1

13.

Elysium is a rotating space station that simulates earth's gravity such that g=9.8 m s−2. It has a diameter of 60 km. What is the speed of people onboard about the centre?

a)

17 m s−1

b)

24 m s−1

c)

540 m s−1

d)

770 m s−1

14.

Find the force due to gravity if the mass of the object is 2300 kg and the mass of the other object is 4000 kg. The distance between the two objects is 0.150 m.

a)

4.09 x 10-3 N

b)

244 N

c)

2.7 x 10-2 N

d)

6.14 x 10-4 N

15.

What would the gravitational force be between the Sun and Mars if they were 2.3 x 1011 m apart? The masses for the Sun and Jupiter are 1.99 x 1030 kg and 6.42 x 1023 kg, respectively.

a)

Fg = 3.8 x 1015 N

b)

Fg = 2.8 x 10-42 N

c)

Fg = 1.6 x 1021 N

d)

Fg = 4.6 x 10-75 N

16.
Luke Skywalker has a mass of 13 kg and weight of 127.4 N on earth. Find his weight on the Endor moon. Acceleration due to gravity of 2 m/s/s.
a)
254.8 N
b)
13 kg
c)
26 N
d)
127.4 kg
17.
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
18.
If the mass on Mars is 6.4 kg x 1023 kg and the mass on Earth is 6.0 kg x 1024 kg, which one would you weigh more on?
a)
Earth
b)
Mars
19.
If I triple the distance between two objects, what happens to their gravitational Force?
a)
3x bigger
b)
3x smaller
c)
9x bigger
d)
9x smaller
20.

In the formula g=Gm1/r2 what is the relationship between g and r?

a)

direct relationship

b)

inverse relationship

c)

inverse square relationship

d)

direct square relationship

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