Basis North - Science - 5Th

Front 1

Froce

Back 1

A push or a pull on an object

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Contact force

Back 2

a push or a pull on one object by another that is touching it

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Noncontact force

Back 3

a force that one object can apply to another object without touching

• gravity
• magnetic force - metals to magnets
• electric force- static (balloon on hair)

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Gravity

Back 4

an attractive force that exists between all objects that have mass

Front 5

Mass

Back 5

is the amount of matter in a object

• measured in kilograms (kg)

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Law of Universal Gravitation

Back 6

all objects are attracted to each other by a gravitational force.

The strength of the force depends on the mass of each object and the distance between them.

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Weight

Back 7

is the gravitational force exerted on an object

• measured in newtons

Front 8

Relationship between weight and mass

Back 8

an objects weight is proportional to its mass

• one object has twice the mass of another object, it also has twice the weight

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Significant

Back 9

important; momentous

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Friction

Back 10

a for that resists the motion of two surface that are touching

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Types of Friction

Back 11

• static friction
• sliding friction
• fluid friction

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Static

Back 12

Science: at rest or having no motion

Front 13

Static Friction

Back 13

prevents surfaces from sliding past each other

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Sliding Friction

Back 14

refers to the resistance created by two objects sliding against each other.

Front 15

Fluid Friction

Back 15

friction between a surface and a fluid

• later or air that flows
• surface and air is air resistance

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Net Force

Back 16

the combination of all the forces acting on an object

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Reference direction

Back 17

a direction that you choose from a starting point to describe an object's position

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Balanced

Back 18

forces acting on an object that combine and form a net force of zero

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unbalanced forces

Back 19

forces acting on an object that combine and form a net force that is not zero

Front 20

Newton's first law of motion

Back 20

if the net force on an object is zero, the motion of the object does not change.

balanced forces and unbalanced forces have different results when they act on an object

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Inertia

Back 21

the tendency of an object to resist a change in tis motion

Front 22

Newtons second law

Back 22

is the acceleration of an object is equal to the net force acting on the object divided by the objects mass.

• the direction of acceleration is the same as the direction of the net force
• acceleration (in m/s^2) = net force (in N)

mass (in kg)

a= f

m

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Circular Motion

Back 23

any motion in which an object is moving along a curved path

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centripetal

Back 24

circular motions, a force that acts perpendicular to the direction of motion, toward the center of the curve

• towards the center

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Newton's third law of motion

Back 25

when one object exerts a force to a second object, the second object exerts an equal force in the opposite direction on the first object

• gymnasts pushed agains the vault and the vault pushes back against the gymnast.
• every objects has an equal and opposite reaction

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Force pair

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is the forces two objects apply to each other

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Momentum

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is a measure of how hard it is to stop a moving object

• momentum (in kg x m/s) = mas (in kg) x velocity (in m/s)
• p = m x v

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Law of conservation of momentum

Back 28

the total momentum of a group of objects stays the same unless outside forces act on the object

• outside forces include friction

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Action Force

Back 29

The force exerted by the first object

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Reaction Force

Back 30

The force exerted by the second object