Free Printable Formative Assessment 6.2

1.

Why does an astronaut weigh less on the moon than on earth?

a)

The astronaut has less mass on the moon

b)

The astronaut is closer to Earth’s center when he or she is on the moon.

c)

The gravitational field strength is less on the moon’s surface than on Earth’s surface.

d)

The astronaut is continually in free fall because the moon orbits Earth.

2.

When calculating the gravitational force between two large objects, you should measure the distance

a)

from the closest points on each body.

b)

from the most distant points on each body.

c)

from the center of each body.

d)

from the center of one body to the closest point on the other body.

3.

The gravitational force between two masses is 36 N. What is the gravitational force if the distance between them is tripled?

a)

4.0 N

b)

9.0 N

c)

18 N

d)

27 N

4.

Two small masses that are 0.10 m apart attract each other with a force of 10.0 N. When they are 0.05 m apart, these masses will attract each other with what force?

a)

2.5 N

b)

5.0 N

c)

20.0 N

d)

40.0 N

5.

How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?

a)

It would increase by a factor of 2.

b)

It would increase by a factor of 4.

c)

It would decrease by a factor of 2.

d)

The speed would not change.

6.

How would the speed of Earth’s orbit around the sun change if Earth’s mass increased by 4 times?

a)

It would increase by a factor of 2.

b)

It would increase by a factor of 4.

c)

It would decrease by a factor of 2.

d)

The speed would not change.

7.

When an astronaut in orbit experiences apparent weightlessness,

a)

no forces act on the astronaut.

b)

no gravitational forces act on the astronaut.

c)

the net gravitational force on the astronaut is zero.

d)

the net gravitational force on the astronaut is not balanced by a normal force.

8.

A satellite in orbit around a planet has an orbital period expressed by the equation: $T=2\pi\sqrt{\frac{r^3}{GM}}$ . If the mass of the satellite is doubled but maintains the same orbital distance from the planet, what would the satellite’s new orbital period be?

a)

$\frac{1}{\sqrt{2}}T$

b)

$2T$

c)

$T$

d)

$\sqrt{T}$

9.

A 77.4 kg student sits at a desk 3.0 m away from a 67.2 kg student for extra social distancing. What is the magnitude of the gravitational force between the two students?

a)

$2.34\times10^3\ \text{N}$

b)

$1.16\times10^{-7}\ \text{N}$

c)

$3.85\times10^{-8}\ \text{N}$

d)

$1.75\times10^{-10}\ \text{N}$

10.

A 54.0 kg satellite is in a circular orbit around Earth with an orbital radius of $4.23\times10^7\ \text{m}$ . What is the orbital speed of the satellite? The mass of the Earth is $5.98\times10^{24}\ \text{kg}$ .

a)

$1.4\times10^{-3}\ \text{m/s}$

b)

$12\ \text{m/s}$

c)

$3.1\times10^3\ \text{m/s}$

d)

$2.5\times10^5\ \text{m/s}$

Formative Assessment 6.2

Total questions: 10

Worksheet time: 3hrs 30mins

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