Law of Gravitation

Gravity and Motion Review

Today we will be reviewing the Standards SC.6.P.13.2, SC.6.P.13.1, and SC.6.P.13.1

Standards

• SC.6.P.13.2 Explore the Law of Gravity by recognizing that every object exerts gravitational force on every other object and that the force depends on how much mass the objects have and how far apart they are.  

• SC.6.P.13.1 Investigate and describe types of forces, including contact forces and forces acting at a distance, such as electrical, magnetic, and gravitational.  

• SC.6.P.13.3 Investigate and describe that an unbalanced force acting on an object changes its speed, or direction of motion, or both.  

SC.6.P.13.2 : Law of Gravity

 Explore the Law of Gravity by recognizing that every object exerts gravitational force on every other object and that the force depends on how much mass the objects have and how far apart they are. 

Multiple Choice

What is the relationship between Distance and Gravity? SC.6.P.13.2: Law of Gravity

• As Distance increases, the Gravity Increases

• As Distance increases, the Gravity decreases

• As Distance decrease, the Gravity decrease

Multiple Choice

What is the relationship between Mass and Gravity? SC.6.P.13.2: Law of Gravity

• As Mass increases, Gravity decreases

• As Mass increases, Gravity increases

• As Mass decreases, Gravity increases

Multiple Choice

The objects shown in the following diagrams have different masses and are different distances apart. Which diagram shows the two objects that have the least force of gravity acting between them? SC.6.P.13.2: Law of Gravity

Multiple Choice

What relationship between gravitational force and distance is shown in the graph below?

• decreases; decreases

• decreases; stays the same

• increases; decreases

• increases; stays the same

Multiple Choice

If it were possible to weigh yourself while in orbit, you would weigh less than you do on Earth. Why is your weight lower while you are in orbit than when you are on Earth’s surface? SC.6.13.2: Law of Gravity

• There is too great a distance between you and Earth for gravity to have any effect.

• The gravities of satellites and other objects in orbit around Earth contribute to your weight while in orbit.

• You have more mass when you are farther away from Earth, and gravity is related to mass.

• There is a greater distance between you and Earth, and gravity is related to distance.

Mass vs. Weight

• Mass- the measure of an amount of matter in an object

• Weight- the amount of gravitational pull on an object

•  Fg    = mass x acceleration of gravity

Multiple Choice

If an object has a mass of 15 kg, what is the object's weight?

• 15 kg

• 147 N

• 15 N

• 24.8 kg

SC.6.P.13.1: Types of Forces

Investigate and describe types of forces, including contact forces and forces acting at a distance, such as electrical, magnetic, and gravitational.  

Multiple Select

What is a Force?

• Push

• Pull

• Gravity

• Potential

Force

A force is a push or a pull on an object.

Force

• A force can affect an object in 2 ways:

• Change the speed of an object.

• Change the direction of an object.

Multiple Choice

A force can cause an object to ____________

• Stay still

• Accelerate

• Stop

• Float

Types of Forces

• Contact Force is a push, or a pull applied by one object to another object that is touching it

• Non-contact Force is a force that pushes or pulls an object without touching it.

Multiple Choice

Which sentence below describes a contact force?

• A book falls to the floor

• A leaf floats in the air and falls to the ground.

• A baseball bat hits

  a ball

• A magnetic force pulls a paper clip toward a magnet.

Contact Force: Friction

• A contact force that resists the sliding motion between two objects that are touching.

• Slow the object down

Contact Force: Applied Force

• A force in which one object directly pushes or pulls on another object

Contact Force: Elastic or Spring Force

• the force exerted by a compressed or stretched object.

Contact Force: Normal force

• the support force exerted on an object that touches another stable object.

Multiple Choice

Moving objects such as airplanes often have more than one force acting on them. The airplane shown here is moving at a constant speed and maintaining a constant height. The forces on the plane change so that friction increases. Which of the following would be the effect of this change, assuming all other forces remain unchanged?

• The plane flies lower

• The plane slows down

• The plane goes farther

• The plane flies higher.

Noncontact Force: Electric Force

• The force between two charged objects

Noncontact Force: Magnetic Force

• The force by which one object attracts another

Noncontact Force: Gravity

• A non-contact attractive force that exists between all objects that have mass.

Multiple Choice

Luis rubbed a balloon on his hair and held the

balloon next to the wall. He observed the

balloon stick to the wall. Which of the following

is responsible for the balloon sticking to the

wall? SC.6.P.13.1 : Types of Forces

• Friction

• Gravity

• Electric force

• Magnetic force