Chapter 10 Sections 1-4 Flashcards Preview

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Flashcards in Chapter 10 Sections 1-4 Deck (33):
1

Force

A push or a pull

2

Newton

The si unit for the strength of a force

3

Net force

The combination of all forces acting on an object

4

Unbalanced forces

Cause an object to stop moving, start moving, or change direction

5

Balanced forces

Equal forces acting on an object in opposite directions

6

Friction

The force that two surfaces exert on each other when they rub against each other

7

Two factors that determine strength of friction

How hard the surfaces push together and the types of surfaces

8

What are the 4 types of friction?

Static, sliding, rolling, and fluid

9

Static friction

The friction that acts on objects that are not moving

10

Sliding friction

The friction that occurs when toe solid surfaces slide over each other

11

Rolling friction

The friction when an object rolls across a surface

12

Fluid friction

The friction that occurs when a soils object moves through a fluid

13

Gravity

A force that pulls objects toward each other

14

The law of universal gravitation

The force of gravity acts between all objects in the universe

15

What are two factors that effect gravitational attraction between objects

Mass and distance

16

Mass

A measure of the amount of matter in an object

17

Weight

A measure of the gravitational force exerted on an object

18

Free fall

When the only force acting on an object is gravity

19

Air resistance

A type of fluid friction on objects falling through air

20

Terminal velocity

The greatest velocity a falling object can reach

21

When is terminal velocity reached?

When the force of air resistance equals the weight of the object

22

Projectile

An object that is thrown

23

Newton's third law

If o r object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction of the first object (for every action there is an equal but opposite reaction)

24

What makes up action reaction pair

The action force and reaction force

25

Why don't action and reaction forces cancel each other out

The forces are acting on different objects

26

What is the equation for momentum?

Mass times velocity

27

Momentum

A characteristic of a moving object that is related to the mass and the velocity of the object

28

Law of conservation of momentum

States that the total momentum of any group of objects remains the same or is conserved unless outside forces act on the object

29

Conservation

Refers to the conditions before and after some event

30

What is an example of an outside force?

Friction

31

What happens in a collision with two moving objects

Momentum is conserved
The momentum of one object decreases while the momentum of the other object increases

32

What happens in a collision with one moving object

Momentum is conserved
All of the momentum form the moving object is transferred to the still object

33

What happens in a collision with connected objects

Total momentum remains the same
The final velocity is half of the initial velocity