# Physics - Lesson 3 + Free Body Diagrams

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A rightward force is applied to a book in order to move it across a desk at constant velocity. Consider frictional forces. Neglect air resistance. A free-body diagram for this situation looks like this:

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### 15 Terms

1

A rightward force is applied to a book in order to move it across a desk at constant velocity. Consider frictional forces. Neglect air resistance. A free-body diagram for this situation looks like this:

Image as shown

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2

When mass increases, by how much does gravity increase? What is the relationship?

By the same amount, because they are directly proportional

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3

When distance ______ gravity increases by what factor? What is that relationship?

When distance DECREASES, gravity increases by 4 times. It is an inversely proportional relationship.

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4

What is ALWAYS the independent variable?

X axis variable

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5

What are the 4 types of friction?

They are: static friction, sliding friction, rolling friction, and fluid friction.

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6

Static Friction definition?

Static friction is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other. EXP: Table lamp resting on the table.

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7

Sliding Friction Definition?

Sliding friction is defined as the resistance that is created between any two objects when they are sliding against each other. EXP: Two cards sliding against each other in a deck.

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8

Rolling Friction definition?

Rolling friction is defined as the force which resists the motion of a ball or wheel and is the weakest types of friction. EXP: Rolling of the log on the ground

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9

Fluid Friction?

Fluid friction is defined as when a solid object bases through a liquid or a gas: the friction strength is dependant on the "thickness" or viscosity of the conditions. EXP: Swimming in a lake

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10

How many grams are in 1 Newton?

100g per Newton

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11

Can you have side arrows canceled if the free body diagram has a constant SPEED?

Yes

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12

Can you have side arrows canceled if it says constant VELOCITY?

No, velocity implies movement even when it is constant

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13

Reinforce:

Two forces acting on an object in the same direction combine into one stronger force

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14

Counteract:

Two forces acting on an object from opposite directions counteract each other. The direction of motion goes in the direction of the STRONGER force.

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15

Cancel:

When forces are equal and opposite to one another, they are balanced and there is no effect on the motion of the object.

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