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Science Flash Cards 7th grade > Science flahscards week 9 > Flashcards

Science flahscards week 9 Flashcards

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1
Q

What is Force?

A

push or pull; described by
strength.

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2
Q

What is a unit of force?

A

Newton (N); where 1N = 100 g

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3
Q

What is force instrument?

A

force meter/spring scale (N)

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4
Q

What is Net forces?

A

Combining Forces.

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5
Q

What does Unbalanced Forces equal?

A

mass

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6
Q

What does Balanced Forces equal?

A

No motion

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7
Q

What happens if two unbalanced forces are in the same direction?

A

The net force is the sum (+) of the
forces.

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8
Q

What is Friction?

A

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

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9
Q

What Factors Affect Friction?

A

weight, rough versus smooth surfaces ,lubricants (oils, grease); ball bearing and surface area.

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10
Q

What is static friction?

A

friction that acts on objects that
are not moving.

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11
Q

What is Sliding Friction?

A

friction when two surfaces slide
over each other.

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12
Q

What is Rolling Friction?

A

friction when an object rolls
across a surface.

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13
Q

What is fluid friction?

A

Friction when an object moves
through a fluid.

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14
Q

How is Friction Helpful?

A

STOP, MOVE, WARMTH, FIRE

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15
Q

How is friction Harmful?

A

WEAR OUT PARTS,FIRE (reentry from space),REDUCES EFFICIENCY.

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16
Q

What is Gravity?

A

An attractive force between
objects containing mass.

17
Q

What Factors affect gravity?

A

Mass and Distance.

18
Q

What is Mass?

A

amount of matter (atoms) in an object

19
Q

What is Distance?

A

length between two points

20
Q

What is terminal Velocity?

A

maximum velocity of a free falling object occurs when the force of air resistance equals the weight of the object.

21
Q

What is weight?

A

The gravitational force exerted on an
object’s mass.

22
Q

What is Free Fall?

A

only gravity acting on a falling object.

23
Q

What is Air Resistance?

A

is a type of fluid friction as an object
falls through the air.

24
Q

What is Projectile?

A

an object that is thrown.

25
Q

What is Inertia?

A

Is the tendency of an object to resist a
change in motion.

26
Q

What Factors affect Inertia?

A

Mass

27
Q

What is Newton’s 2nd Law of Motion?

A

acceleration depends on the object’s mass and the force acting on the object.

28
Q

what is Newton’s 1st Law of Motion Inertia?

A

an object at rest will remain at rest and an
object moving at a constant velocity will
continue moving at a constant velocity.

29
Q

what is Newton’s 3rd Law of Motion Action/Reaction?

A

For every action there is an equal but opposite reaction.

30
Q

What is momentum?

A

a measure (quantity) of motion, where:

Science Flash Cards 7th grade (8 decks)

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