Gravity - A Non-Contact Force

Non-Contact Forces

Identify and/or describe forces acting at a distance such as magnetic, electrical and gravitational.   

Describe and illustrate how electrical charges interact.  

Describe and illustrate how magnetic poles interact. 

1. What are the two main types of Forces? 

2. What is a contact force? List some examples. 

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Please write question and answer in your notebook.

​Bellwork

• Forces that act on two objects from a distance.

• The objects to not have to touch each other.

• Measured in Newtons (N).

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Non-Contact Forces

Examples of

Multiple Choice

Why are some forces considered to be noncontact forces?

• Objects must be far apart in order to exert a force.

• Objects push each other apart to increase the distance between them.

• Objects do not have to touch each other to experience a force.

• Objects must be large in size in order to exert a force that is strong enough to notice.

Multiple Choice

All of these are noncontact forces, except

• friction

• gravity

• electricity

• magnetism

• Magnets have two poles, north and south, where the forces are the strongest.

• Opposite poles attract, or pull, on each other.

• Like poles repel, or push away from, each other.

• All magnets have an invisible magnetic field.

• The strength of magnetic forces depend on distance and materials.

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Magnetic Forces

Multiple Choice

What are two factors that affect the strength of magnetic forces?

• poles and gravity

• distance and material

• distance and direction

• electricity and gravity

Multiple Choice

A magnetic field of a magnet gets _____________ the further magnetic object moves away from the magnet.

• positive

• weaker

• negative

• stronger

• Is a push or pull between charged objects.

• Static electricity is a buildup of electrical charge on an object.

• Objects can have a positive or negative charge depending on their number of electrons (-).

• Like magnets, same or like charged objects repel, while opposite charged objects attract.

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Electric Forces

Multiple Choice

Electrical charge built up on the surface of an object is called _________________.

• current electricity

• lightning

• electrons

• static electricity

Multiple Choice

Negative and positive charges repel.

• True

• False

• A force that pulls all objects toward each other.

• Gravitational force depends on two factors, mass and distance.

• The more mass an object has, the stronger its gravitational force.

• The greater the distance between two objects, the less gravitational force they exert on each other.

Gravitational Force

Multiple Choice

What two factors determine the strength of the gravitational force between two objects?

• acceleration and distance

• mass and distance

• speed and distance

• mass and speed

Multiple Choice

When the mass increases, the strength of the gravitational field _______.

• increases

• decreases

• stays the same

• constantly changes

Keep in mind that weight is measured in Newtons (N) or in Pounds (lbs) while mass is measured in Grams (g)

Danger! Falling Objects: Crash Course Kids #32.1 - YouTube

Please write down the title of the video.

In your notebooks, write one thing that you learned.

We will discuss and review after as a class.

• ​In your notebook, write down the statement and classify the force that corresponds to that statement.

• Work in groups

• 15 Minutes

• Found on Showbie

• Independent

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Independent Work