Chapter 10 Sections 1-4

Question 1

Force

Answer 1

A push or a pull

Question 2

Newton

Answer 2

The si unit for the strength of a force

Question 3

Net force

Answer 3

The combination of all forces acting on an object

Question 4

Unbalanced forces

Answer 4

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

Question 5

Balanced forces

Answer 5

Equal forces acting on an object in opposite directions

Question 6

Friction

Answer 6

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

Question 7

Two factors that determine strength of friction

Answer 7

How hard the surfaces push together and the types of surfaces

Question 8

What are the 4 types of friction?

Answer 8

Static, sliding, rolling, and fluid

Question 9

Static friction

Answer 9

The friction that acts on objects that are not moving

Question 10

Sliding friction

Answer 10

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

Question 11

Rolling friction

Answer 11

The friction when an object rolls across a surface

Question 12

Fluid friction

Answer 12

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

Question 13

Gravity

Answer 13

A force that pulls objects toward each other

Question 14

The law of universal gravitation

Answer 14

The force of gravity acts between all objects in the universe

Question 15

What are two factors that effect gravitational attraction between objects

Answer 15

Mass and distance

Question 16

Mass

Answer 16

A measure of the amount of matter in an object

Question 17

Weight

Answer 17

A measure of the gravitational force exerted on an object

Question 18

Free fall

Answer 18

When the only force acting on an object is gravity

Question 19

Air resistance

Answer 19

A type of fluid friction on objects falling through air

Question 20

Terminal velocity

Answer 20

The greatest velocity a falling object can reach

Question 21

When is terminal velocity reached?

Answer 21

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

Question 22

Projectile

Answer 22

An object that is thrown

Question 23

Newton’s third law

Answer 23

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)

Question 24

What makes up action reaction pair

Answer 24

The action force and reaction force

Question 25

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

Answer 25

The forces are acting on different objects

Question 26

What is the equation for momentum?

Answer 26

Mass times velocity

Question 27

Momentum

Answer 27

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

Question 28

Law of conservation of momentum

Answer 28

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

Question 29

Conservation

Answer 29

Refers to the conditions before and after some event

Question 30

What is an example of an outside force?

Answer 30

Friction

Question 31

What happens in a collision with two moving objects

Answer 31

Momentum is conserved

The momentum of one object decreases while the momentum of the other object increases

Question 32

What happens in a collision with one moving object

Answer 32

Momentum is conserved

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

Question 33

What happens in a collision with connected objects

Answer 33

Total momentum remains the same

The final velocity is half of the initial velocity