Science flahscards week 9

Question 1

What is Force?

Answer 1

push or pull; described by
strength.

Question 2

What is a unit of force?

Answer 2

Newton (N); where 1N = 100 g

Question 3

What is force instrument?

Answer 3

force meter/spring scale (N)

Question 4

What is Net forces?

Answer 4

Combining Forces.

Question 5

What does Unbalanced Forces equal?

Answer 5

mass

Question 6

What does Balanced Forces equal?

Answer 6

No motion

Question 7

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

Answer 7

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

Question 8

What is Friction?

Answer 8

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

Question 9

What Factors Affect Friction?

Answer 9

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

Question 10

What is static friction?

Answer 10

friction that acts on objects that
are not moving.

Question 11

What is Sliding Friction?

Answer 11

friction when two surfaces slide
over each other.

Question 12

What is Rolling Friction?

Answer 12

friction when an object rolls
across a surface.

Question 13

What is fluid friction?

Answer 13

Friction when an object moves
through a fluid.

Question 14

How is Friction Helpful?

Answer 14

STOP, MOVE, WARMTH, FIRE

Question 15

How is friction Harmful?

Answer 15

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

Question 16

What is Gravity?

Answer 16

An attractive force between
objects containing mass.

Question 17

What Factors affect gravity?

Answer 17

Mass and Distance.

Question 18

What is Mass?

Answer 18

amount of matter (atoms) in an object

Question 19

What is Distance?

Answer 19

length between two points

Question 20

What is terminal Velocity?

Answer 20

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

Question 21

What is weight?

Answer 21

The gravitational force exerted on an
object’s mass.

Question 22

What is Free Fall?

Answer 22

only gravity acting on a falling object.

Question 23

What is Air Resistance?

Answer 23

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

Question 24

What is Projectile?

Answer 24

an object that is thrown.

Question 25

What is Inertia?

Answer 25

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

Question 26

What Factors affect Inertia?

Answer 26

Mass

Question 27

What is Newton’s 2nd Law of Motion?

Answer 27

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

Question 28

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

Answer 28

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

Question 29

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

Answer 29

For every action there is an equal but opposite reaction.

Question 30

What is momentum?

Answer 30

a measure (quantity) of motion, where: