Abby Science Chapter 2

Question 1

Newton (N) is a

Answer 1

unit of measure for force

Question 2

What is the label for Newton

Answer 2

(N) kg x m/s^2

Question 3

Two forces exerted on each other when they rub against each other in opposite directions

Answer 3

Friction

Question 4

The strength of friction depends on what two factors

Answer 4

1. How hard surfaces pushed together

2. The types of surfaces involved

Question 5

How many types of friction are there

Answer 5

Four

Question 6

One object is stationary and tell enough force is used to move it. what type of fiction is this

Answer 6

Static friction

Question 7

Two solid surfaces slide over each other like snow and ice with skis

Answer 7

Sliding friction

Question 8

When An object rolls across a surface

Answer 8

Rolling friction

Question 9

When a solid object moves through air, water, oil that allow the object to flow easily (air resistance)

Answer 9

Fluid friction

Question 10

A force that pulls objects toward each other

Answer 10

Gravity

Question 11

What are the two factors that affect gravity

Answer 11

Mass and distance

Question 12

The more mass and object has the greater the

Answer 12

Gravitational force

Question 13

The further apart two objects are the ________ the gravitational force between them

Answer 13

Lesser

Question 14

The force of gravity on a person or object at the surface of the planet

Answer 14

Weight

Question 15

Is a state and object is in that when the only force acting on the object is gravity

Answer 15

Free fall

Question 16

In ______ The force of gravity is an unbalanced force which causes an object to accelerate

Answer 16

Free fall

Question 17

A type of fluid friction this is not the same for all objects it is the upward force exerted on an object falling down like a leaf or ranch

Answer 17

Air resistance

Question 18

The greatest velocity an object can reach when the force of air resistance equals the weight of the object

Answer 18

Terminal velocity

Question 19

When forces are balanced there is no

Answer 19

Acceleration

Question 20

When in object is at rest it will stay at rest and an object will continue moving at a constant velocity unless it is acted upon by an unbalanced force

Answer 20

Newtons first law of motion

Question 21

States that acceleration depends on the objects mass and on the net force acting on the object

Answer 21

Newtons second law of motion

Question 22

What is the formula for acceleration

Answer 22

Net force/ mass = acceleration

Question 23

Measures the amount of matter in an object

Answer 23

Mass

Question 24

The force of gravity on a person on object at the surface of the planet

Answer 24

Weight

Question 25

If one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction on the first object

Answer 25

Newtons third law of motion

Question 26

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

Answer 26

Momentum

Question 27

Formula for momentum

Answer 27

Mass x velocity

Question 28

In an absence of outside forces the total momentum of objects that interact does not change. The amount is the same before and after they react unless outside forces act on the objects

Answer 28

Law of conservation of momentum

Question 29

Any object that orbits another object in space

Answer 29

Satellite

Question 30

A force that causes an object to move in a circular path

Answer 30

Centripetal force

Question 31

Formula for centripetal force

Answer 31

Prefix centri = center

Question 32

Satellites in orbit around Earth continuously fall toward Earth. But because Earth is ______ they travel around it

Answer 32

Curved

Question 33

A rocket can rise into the air because gases it expels with a downward action force, exert an _____________________ force on the rocket

Answer 33

Equal but opposite reaction

Question 34

A ____ force causes an objects motion to change

Answer 34

Unbalanced