Chapter 3 Test

motion

is a change in an object’s position relative to the reference point.

displacement

is the distance and direction of the objects change in position.

speed (write out)

is the distance an object travels per unit of time.

average Speed

is the total distance traveled divided by the total time of the travel.

velocity

includes the speed of an object and the direction of its motion.

acceleration (write out)

is the rate of change of velocity.

momnentum

of an object is the product of its mass and velocity.

force

is a push or pull.

friction

is the force that opposes the sliding motion of the two surfaces that are touching each other.

Inertia

is the tendency of an object to resist any chance in its motion.

air resistance

is a friction like force that opposes the motion of objects that move through air.

terminal velocity

is the maximum speed an object will reach when falling through a substance, such as air.

free fall

is the only force acting on an object

centripetal force

is a force exerted toward the center of a curvved path. 0

Unbalanced force

are not equal in all directions. (WILL cause change in motion.)

weight

the measurement of gravitational force exerted on an objects mass.

net force

the sum of all forces acting on an object.

mass

a measurement of the quantity of matter in an object.

g

accleration of falling object due to gravity in a vacuum. 9.8 m/s²

projectile

anything that is thrown or shot through the air.

balanced force

forces acting on an object that are equal in size but opposite in direction.

mircowelds

the source of friction between two surfaces pressed together.

gravity

is an attractive force between any 2 objects that depends on the masses of the objects and distance between the onjects.

sliding

opposes motion of 2 surfaces sliding past each other & is caused by mircowelds constantly breaking & forming as object slides

rolling

static friction acting over area, surfaces are in contact.

Newtons 1st law of motion

An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an outside force.

Newtons 2nd law of motion

The acceleration of an objects depends on the mass of the object and the net force acting on an object.

Newtons 3rd law of motion

For every action force there is an equal but opposite reaction force.

3 factors that affect whether an object will reach terminal velocity

Height, mass, and surface area

4 factors that affect the amount of friction between the surfaces of objects

type of material, texture/roughness, amount of force, and surface area.

2 factors that affect the amount of air resistance acting on an object.

surface area(size and shape), and velocity

2 factors that determine how much gravitatonal force will be exerted between two objects

The mass of the objects and the distance between the 2 objects.( mass and distance)

Law of Conservation of momentum

if no external forces act on a group of objects, their total momentum doesn’t change.

strong nuclear force (1 of the 4 of fundamental forces)

golds nucleus together

electromagnetic( 1 of the 4 of the fundamental forces)

force between charged particles

weak nuclear (1 of the 4 fundamental forces)

force that decays neutron and proton

gravity( 1 of the 4 fundamental forces)

force between two objects

speed formula

s= d/t

speed unit

m/s

velocity formula

v= d/t

velocity unit

m/s & direction

momentum formula

p= m x v

momentum unit

kg x m/s

accerleration formula

a= Vf-Vi/t

acceleration unit

m/s to the second power

force formula

F= m x a

force unit

N , kg, m/s

weigth formula

W= m x g

weight unit

N. kg, N/kg