When two forces act in the same direction

the add together

inertia

the tendency of an object to resist change in its motion is known as

the greater the mass of an boject

the greater its inertia

weight

the force of gravity on a person or object on the surface of a planet is called

one way to increase acceleration is by

decreasing mass

friction

is the force that one surface exerts on another when the two rub against each other

which of the following is an example of rolling friction

bike tires on the road as you ride

friction

air resistence ia a type of

the law of universal gravitation states that any two objects in the universe, without exception

attract each other

forces can be added together only it they are

acting on the same object

according to the law of conservation of momentum, when two objects collide in the avsence of friction

momentum is not lost

the achievement of lifting a rocket off the ground and into space can be explained by

Newton’s third law

force

in physical science, a push or a pull is called this

velocity

the momentum of an object is in the same direction as its

mass

the amount of matter in an object is called

gravity

the force that pulls falling objects towards Earth is called

According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail

excerts an equal force back on the hammer

newton

the SI unit for force is the

balanced forces acting on an object

never change the object’s motion

When an object’s distance from another object is changing

ia is in motion

meter

the basic SI unit of length is

time

Speed equals distance divided by

When you know both the speed and direction of an object’s motion, you know the

velocity of the object

time

you can show the motion of an object on a line graph in which you plot distance against

rise

te steepness of a line on a graph is called

Which is an example of deceleration

a car approaching a red light

time

to determin the acceleration reat of an object, you must calculate the change in speed during each unit of

kilometers per hour per hour

if speed is measured in likometers per hour and time is measured in hours, the unit of acceleration is

average speed is

the total distance traveled divided by by the total time

a reference point

a place or object used for comparision to determine if something is in motion is

on a graph showing distance versus time, a horizonal line represents an object that is

not moving at all

If you know the distance an object has traveled in a certain amount of time, you can determine

the speed of the object

acceleration

changing direction is an example of a kind of

15 km/h

if a bicyclist travels 30 kilometers in two hours, her average speed is

the moon accelerates because it is

continuosly changing directions

average speed

If you know a car traveled 30 kilometers in 3 hours. you can find its….

Balanced forces

do not change an object’s motion

the property of matter that resists a change is notion is called

inertia

friction depends on the types of surfaces involved and how

hard the surfaces push together

masee and distance

affect the gravitational attraction between objects

Newton’s third law of motion states that for every action there is an equal by opposite

reaction

a unit of momentum is

kgrm’s

Motion is measured relative to a

reference point

a child riding on a merry-go-round is accelerating because

his direction is changing

The SI unit of acceleration is

the meter per second per second

The overall force on an object after all teh forces are added together is called

the net force

Unbalanced forces action on an object produce a change in the

object’s motion

a measure of an object’s mass

is a measure of the object’s inertia

on newton

is the force required to accelerate 1 kilogram of mass at 1 meter per second per second

A person traveling in a car that stops suddenly keeps moving forward due to

inertia

the downward force acting on an object in free fall is the force of

gravity

a projectile

is an object that is thrown

at the distance between two objects decreases, teh gravitational force between them

increases

According to Newton’s third law of motion

the strength of a reaction force is equal to the strength of the action force.

If the action force of a bat striking a ball accelerates the ball in one direction,

the reaction force accelerates the bat in the opposite direction

friction acts in a direction opposite

to an object’s direction of motion

a change in an object’s position relative to a regerence point is called

motion

the distance traveled by a moving object per unit if time is called

speed

the basic SI unith of lenght is the

meter

the statement that the motion of a hurrican is 20 kilometers per hour in an easterly direction is a description of the hurricane’s

velocity

acceleration is the rate of change in

speed

the motion of a car stopping at a traffic light is an example of

negative acceleration. also called deceleration

the abbreviation of the unit acceleration is

m/s 2

If a car is speeding up,

its initial speed is less than its final speed

If a train traveling at 30 m/s brakes to a stop in 1 minute

its acceleratio is 0.5 m/s2

It two lines appear on the same motion graph

the line with the steeper slope indicates a greater speed.