Collect graph paper (or use your own) before you start this task. This graph MUST be handed in at the end of the E-day session in order for it to be marked.
To type answers that have superscripts, please follow this format (using ^ to indicate superscript):
For scientific notation: e.g. One hundred thousand (100 000) would be typed like this: 1,0 x 10^5
For units such as metres per second squared, type is like this m.s^-2
Collect graph paper (or use your own) before you start this task. This graph MUST be handed in at the end of the E-day session in order for it to be marked.
To type answers that have superscripts, please follow this format (using ^ to indicate superscript):
For scientific notation: e.g. One hundred thousand (100 000) would be typed like this: 1,0 x 10^5
For units such as metres per second squared, type is like this m.s^-2
SECTION A
Watch the slide presentation embedded below on mass and weight and then answer the questions that follow. To go to the next slide click on "next" in the bottom right hand corner.
Here is the direct link to the presentation if yours is not working in the Formative below.
Calculate the value of the acceleration due to gravity "g" on Mars, by following this reasoning:
Mars has a mass of _______ (answer to 2 decimal places and include units) and a radius of _______ (answer to 2 decimal places and include CORRECT units).
Using the equation:
Remember that big "G" = 6,7 x 10-11
g can be calculated to be _______ (answer to 2 decimal places and include units).
Question 20
20.
We are now going to calculate the gravitational force (F) between Earth and Venus when they are 61 000 000 km apart, using Newton's law of universal gravitation:
m1 = mass of Earth = _______ (answer to 2 decimal places and include units), and
m2 = mass of Venus = _______ (answer to 2 decimal places and include units)
To calculate "r":
HINT: Look above at the information provided to remind yourself what 'r' is.
Use the information in the image above (sizes of the planets) and the fact that they are 61 000 000 (or 6,1 x 10^7km) apart.
∴ r = _______ (answer in scientific notation as shown above and include units).
Gravitational force is therefore:
∴ F = _______ (answer in scientific notation as shown above and include units).
SECTION B
Graphing activity.
Complete the graph on paper and hand in to Mrs Kühn at the end of the session.
Required
2
Required
8
Required
5
Required
1
Required
2
Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Watch the video on Newton's law of universal gravitation. Here is the link if this video is not working on Formative: video
Newton's law of universal gravitation is described below too:
Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Note the mathematical relationship between gravitational force and the product of the masses:
Question 10
10.
Question 11
11.
Note the mathematical relationship between gravitational force and distance:
Question 12
12.
Question 13
13.
Read the following information from your textbook pg 213:
Question 14
14.
Question 15
15.
Question 16
16.
Consider the masses of the following planets in our solar system:
Order them from smallest mass to greatest mass
Mars
Neptune
Venus
Earth
Mercury
Order the planets from smallest to largest (diameter)
Mercury
Mars
Earth
Neptune
Venus
The following data was collected on a particular planet during an investigation to calculate the acceleration due to gravity (g) on that planet. The weight of each mass was measured and the results were recorded in the table below:
Question 21
21.
Identify the variables in this investigation.
The dependent variable is _______________ and the independent variable is ______________ .
Other Answer Choices:
radus of planet
mass (kg)
weight (N)
acceleration due to gravity
Question 22
22.
Plot a graph of weight vs mass on your piece of graph paper. Draw a line of best fit.
Question 23
23.
On the back of your graph, calculate the gradient of your line. Be sure to show the values you used ON YOUR ACTUAL GRAPH (circle them) and also include the appropriate unit for this gradient (as per the graph)
Question 24
24.
What is the acceleration due to gravity (g) on this planet? Use the appropriate unit.
Question 25
25.
What is the property of an object that determines the amount of matter it contains?
mass
weight
volume
density
What is the force experienced by an object due to the gravitational pull of the Earth?
mass
weight
volume
density
Which of the following is a vector quantity?
mass
weight
volume
density
What is the SI unit of mass?
newton (N)
kilogram (kg)
meter (m)
joule (J)
Which of the following statements is correct?
Mass and weight are the same.
Mass is a measure of the amount of matter, while weight is the force exerted by gravity on an object.
Mass is the force experienced by an object due to gravity.
Weight is the measure of the amount of matter in an object.
Which of the following statements is true regarding the gravitational force?
It only exists between planets and stars
It is always attractive
It does not depend on the mass of the objects
It is a contact force
What is the gravitational force between two objects directly proportional to?
The mass of one object
The mass of both objects
The distance between the objects
The velocity of the objects
What happens to an object's weight when it is taken to a location with higher gravity, such as a planet with greater mass?
The weight decreases
The weight increases
The weight remains the same
The weight becomes zero
Why do astronauts experience weightlessness in space?
Because there is no gravity in space
Because their mass decreases in space
Because they are far from Earth
Because they are in freefall around the Earth
What happens to the gravitational force between two objects if the mass of one object is doubled?
It increases by a factor of 2
It decreases by a factor of 2
It increases by a factor of 4
It decreases by a factor of 4
What happens to the gravitational force between two objects if the mass of BOTH objects are doubled?
It increases by a factor of 2
It decreases by a factor of 2
It increases by a factor of 4
It decreases by a factor of 4
What happens to the gravitational force between two objects if the distance between them is doubled?
It increases by a factor of 2
It decreases by a factor of 2
It increases by a factor of 4
It decreases by a factor of 4
What happens to the gravitational force between two objects if the distance between them is halved?
It increases by a factor of 2
It decreases by a factor of 2
It increases by a factor of 4
It decreases by a factor of 4
What is the relation between an object's mass and weight?
Weight = Mass x Acceleration due to gravity
Weight = Mass / Acceleration due to gravity
Weight = Mass + Acceleration due to gravity
Weight = Mass - Acceleration due to gravity
Which property of an object remains constant on the Moon's surface compared to its value on Earth?
Mass
Weight
Inertia
Volume
Which of the following objects experiences the strongest gravitational force on the surface of the Earth?
An astronaut in space
A person standing on the ground
A bird flying in the sky
A fish swimming in the ocean
Hence, use the following data to identify the planet used in this investigation: