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Free gamified quizzes on every subject that students play in class and at home. Pick an existing quiz or create your own for review, formative assessment, and more.

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Balanced & Unbalanced Forces | Forces & Motion | Physics | FuseSchool

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Science LT 5 | Piktochart Infographic Editor

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New Piktochart | Piktochart Infographic Editor

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Inertia
a maters Resistance to a change in motion
Friction
Friction is when two things rub together. When you rub your hands together it creates heat between your hands.
Buoyancy
To float on something like a boat on water unlike gravity  it keep you from the earth
Gravity
The force that attracts a body toward the center of earth, or toward any other physical body having mass.

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4 types of forces (Inertia and Friction)

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What Is Force?

You've probably heard of 'The Force,' but this isn't quite the same as a force. A force is a push or pull on an object. This push or pull comes from the objects interacting with one another and only from such interactions. Once the interaction stops, there is no longer any force.

While forces come in pairs, there can be even more forces in an interaction. For example, when you throw a ball into the air, the ball is experiencing the force of gravity, friction, and the pushing force from you all at the same time!

Forces are important because, as we learned in another lesson, they are responsible for changes in motion. In fact, Isaac Newton describes this in his first law. This law of inertia states that an object continues in its state of rest or motion unless acted on by an outside unbalanced force. So, your cat sleeping on the couch isn't likely to move unless you apply a force (pushing on the cat).

Newton wasn't just great at scientific laws; he also got his own unit of measure! The standard unit of force is the Newton, or N. So, for example, if something is 5 N, this means 5 Newton force.

But force has both magnitude and direction, which makes it a vector quantity. The magnitude of the force is how much, and the direction is in which way. So, in order to fully describe the force, we would need to say the force is 5 N and in which direction (like downward or to the left). As with any vector quantity, we show forces with arrows. The arrow's length represents the magnitude, while the arrow's direction shows the direction of the force.

We can put forces into two different categories, contact and non-contact. Let's look at each one more closely to get a better understanding of them.

Contact forces are just what they sound like: forces that result from the interaction of two objects in contact with each other. Forces that belong in this category are friction, air resistance, normal force, applied force, tension force, and spring force.

Friction is a force that you are quite familiar with already. This force occurs when objects rub against each other. The burn you feel on your skin when you go down a slide? Friction! Your brake pads and rotors stopping your car? Friction again! Friction acts in a direction to oppose motion - when you pull a bag across the floor to the right, the force of friction on the bag is to the left.

Even objects falling downward through the air experience friction acting upward, this time from the air. This special type of frictional force is called air resistance. It's the friction that acts on an object as it moves through the air. Again, this force is in a direction opposite to the direction of the object's motion.

There's a really important force that keeps us from falling through the floor called the normal force. This is the upward force that balances the weight of an object (another force that we'll talk about later) on a surface. If the object is at rest on a horizontal surface, the normal force is the same as the object's weight. Gravity pulls you down, but the normal force pushes back up on you from the floor.

An applied force is a force that is applied to an object by another object. If you push a box across the floor, your force pushing on the box is the applied force. And remember how we said before that you can have multiple forces acting at once? You better believe that in addition to your applied force on the box, that box is also experiencing friction from the floor, gravity pulling it down, and the normal force pushing it up - all at the same time!

Tension force is the tension through a string or other fully-stretched object. If you tie something to a string and let it hang from your fingers, the tension force is the same for both the object at the end of the string and your fingers holding that string.

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force: definition and types - video & lesson transcript | study.com

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Force: Definition and Types - Video & Lesson Transcript | Study.com

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You've probably heard of 'The Force,' but this isn't quite the same as a force. A force is a push or pull on an object. This push or pull comes from the objects interacting with one another and only from such interactions. Once the interaction stops, there is no longer any force.

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If you don't understand buoyancy and want it explained in less than a minute, try this video. I apologise for the bad quality as I did not have much time to make it and had never used the software before. I apologise for any inconvenience caused.

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(watch until it stops you)

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Gravity

I would like you to know that you are an attractive person. I realize that we've never met, yet I am certain that you are indeed attractive. Do you know how I can say this with such confidence? Because you, just like all objects we can see and touch, have mass.

Maybe I need to clarify something. When I'm talking about attractiveness, I'm not referring to the way you look. I'm talking about the attractive force called gravity. Gravity is the force that pulls objects with mass toward each other.

We know about gravity thanks to the work of Sir Isaac Newton. He's the early scientist that got hit on the head with a falling apple. He deduced that the apple fell to the ground because it was being acted on by the earth's attractive force, which he called gravity.

Newton's Law of Universal Gravitation states that all objects in the universe are attracted to each other through the force of gravity. Gravity affects everything in the universe, but the amount of gravity affecting an object depends on two things: the masses of the objects being attracted and the distance between the objects. In this lesson, we will take a look at how mass and distance affect gravity.

Mass

Mass is the measure of the amount of matter in an object. For example, a bowling ball and a ping pong ball are made up of matter. However, a bowling ball contains more matter than a ping pong ball and therefore has more mass. A good way to think about the relationship between mass and gravity is to think of the saying 'the bigger they are the harder they fall.' In other words, the gravitational force between objects increases as the masses of those objects increase.

The earth is an object with a lot of mass, so objects fall toward the center of the earth with a noticeable amount of force. This explains why it's easier to lift a ping pong ball over your head than it is to lift a bowling ball. The smaller mass of the ping pong ball means less gravitational pull to overcome. Keep in mind that the Law of Universal Gravitation states that all objects with mass have gravity. Therefore, the bowling ball and the ping pong ball are actually being pulled toward each other. However, their masses are much too small for us to notice the attraction.

This relationship between mass and gravity also explains why you can jump higher on the moon than you can on Earth. The moon has less mass than Earth; therefore, the moon's gravitational force is less than that of the earth. Astronauts leap and jump with ease on the moon because there's less gravity to pull them down.

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the effects of mass & distance on gravity - video & lesson transcript | study.com

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The Effects of Mass & Distance on Gravity - Video & Lesson Transcript | Study.com

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I would like you to know that you are an attractive person. I realize that we've never met, yet I am certain that you are indeed attractive. Do you know how I can say this with such confidence? Because you, just like all objects we can see and touch, have mass.

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Mass and distance on gravity (2:00 - 5:35)