OK everyone get ready to learn a new vocabulary term.

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Presentation transcript:

OK everyone get ready to learn a new vocabulary term.

Force Today we are going to be defining force.

Gravity We’ll also define gravity,

Mass mass,

Weight and weight.

Before we begin defining new terms, let us review some key words we should already know, and make sure you are firm in your understanding.

Matter Matter takes up space and has mass. Matter is a liquid, gas or soap

Grams Grams are used to measure mass.

Let’s review.

What unit is mass measured in? grams

What are 3 states of matter? Liquid, Gas, solid

Force Now, let’s define what force means

force: a push or pull on an object. Force is a push or a pull on an object.

Force Contact Noncontact There are 2 types of forces that can be applied.

Force Contact Noncontact The first is a contact force.

contact force: push or pull applied by touch. A contact force is a push or pull applied by touch. Here the girl is applying a force to the car to push it forward.

Earthquakes When earth’s plates move, the contact force causes earthquakes.

Force Contact Noncontact The second is the noncontact force.

noncontact force: pushes or pulls without touching it. A non-contact force is a push or pull on an object without touching it. Gravity is an example of a non-contact force. We will learn more about gravity in this lesson.

What are the 2 different types of forces? Contact and noncontact.

If I am opening my fridge, what type of force am I applying? Contact Noncontact

If I am opening my fridge, what type of force am I applying? Contact Noncontact

If my pencil falls to the ground, what type of force is being applied? Contact Noncontact

If my pencil falls to the ground, what type of force is being applied? Contact Noncontact

Gravity Now, let’s define what gravity means.

gravity: a non-contact force that occurs between all objects that have mass Gravity is a non-contact force that occurs between all objects that have mass.

gravity: a non-contact force that occurs between all objects that have mass Let’s take a closer look at mass.

Mass Now, let’s define what mass is.

mass: amount of matter in an object Mass is the amount of matter an object has. It is usually measured in kilograms.

Here gravity exists between the apple and earth. Both have mass.

Weight Now, let’s define what weight is.

weight: is the gravitational force exerted on an object. Weight is the gravitational force, or amount of gravity, exerted on an object.

Scales measure weight. When you are measuring your weight, you are measuring the force exerted on you by the earth.

You weigh 10% less orbiting the earth You weight 10% orbiting the earth than you do standing on the earth.

100 lbs 90 lbs If you weighted 100 pounds on earth, you would weight 90 pounds orbiting the earth.

Your mass does not change. Mass is NOT affected by gravity. Your mass does not change where are you are.

Weight is relative Weight is relative to what and where you are measuring.

mass ≠ weight Mass is not the same as weight.

Let’s review everything we’ve covered today.

Gravity is an attractive force between objects that have ______. Volume Mass Distance

Gravity is an attractive force between objects that have ______. Volume Mass Distance

Gravity is an example of a ________ force. Contact Noncontact

Gravity is an example of a ________ force. Contact Noncontact

True or False: Weight changes based on the gravitational force

True

Are mass and weight the same thing? Yes No

Are mass and weight the same thing? Yes No

What are the 2 different types of forces? Contact and noncontact.

What is an attractive force between objects that have mass? Gravity

Remember!!! So remember! <keep this slide>

force: a push or pull on an object. Force is a push or a pull on an object.

gravity: a non-contact force that occurs between all objects that have mass Gravity is a non-contact force that occurs between all objects that have mass.

mass: amount of matter in an object Mass is the amount of matter an object has. It is usually measured in kilograms.

weight: is the gravitational force exerted on an object. Weight is the gravitational force, or amount of gravity, exerted on an object.

Thanks for watching, and please continue watching CAPs available from this website.

Questions or Comments to Michael Kennedy, Ph.D. This Video Created With Resources From: Cooperative Agreement # R324B130023 Curry School Foundation’s Research and Development Fund Questions or Comments to Michael Kennedy, Ph.D. MKennedy@Virginia.edu