ScienceFusion: Forces and Motion: Chapter 1 Lessons 3 & 4

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This is for the Physics final of the first semester of Al-Rowad. Please note that it doesn't include all the info required to do the exam itself.

41 Terms

1

Force

A push or pull

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2

A forces have a ________

Size and direction

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3

A force can cause an object to change its ______________

Speed and/or direction

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4

When you see a change in an object's motion____________

One or more forces caused the change

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5

Newtons

The unit for force

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6

Contact force

A force exerted during contact

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7

Friction

Example of a contact force

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8

Gravity, magnetic force

Forces that can act from a distance

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9

Net force

The combination of all the forces acting on an object

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10

To determine net force in the same direction

Add the forces together

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11

To determine net force in opposite directions

Subtract the smaller force from the larger force

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12

Balanced forces

When the net force of an object produces 0 N

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13

Balanced forces will NOT

Cause a change in a moving object or cause a nonmoving object to start moving

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14

Unbalanced forces

When the net force of an object DOESN'T produce 0 N

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15

Unbalanced forces produce

A change in an object's motion (Including speed and direction)

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16

Acceleration

The change in motion of a force

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17

Newton's First Law of Motion

An object at rest stays at rest, and an object in motion at the same speed and direction, unless it experiences an unbalanced force.

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18

Newton's First Law of Motion is also called

The Law of Inertia

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19

Inertia

The tendency of all objects to resist a change

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20

An object will not move unless_________

A force makes it move.

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21

When an unbalanced force acts on an object ________

The object accelerates

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22

Newton's Second Law of Motion

The acceleration of an object depends on the mass of the object and the amount of force applied.

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23

Other words for Newton's Second Law of Motion

Objects that have different masses will have different accelerations if the same amount of force is used.

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24

Formula for Newton's Second Law of Motion

Ć’ = m Ă— a

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25

"F" in Newton's Second Law of Motion

Stands for force

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26

"M" in Newton's Second Law of Motion

Stands for mass

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27

"A" in Newton's Second Law of Motion

Stands for acceleration

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28

Newton's Third Law of Motion

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

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29

Other words for Newton's Third Law of Motion

All forces act in pairs

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30

Action force

A force that is applied to an object

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31

Reaction force

A force that acts opposite to an action force

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32

Gravitation

A force pair between different objects

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33

Gravity

Force of attraction between two objects due to their mass

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34

Why is gravity an attractive force?

Earth's gravity pulls everything towards its center.

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35

Acceleration depends on

Force and mass

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36

Why are some planets/moons not spherical?

Because they do not have much mass

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37

What is the equation for the force of gravity?

f = mg

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38

What is the value of "g" in f = mg?

9.81 m/s²

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39

The gravitational force between two objects _______ as the distance between their center ________.

Increases, decreases

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40

Free fall

When gravity is pulling something down and no other forces are acting on it

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41

Orbit

When an object travels around another in space

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