43 terms

Force

Push or pull.

Motion

What is a change in position or location?

Contact

What is it when one object pushes or pulls another object by touching it?

When you push your pencil to make it move over your paper.

What is an example of contact?

Gravity

What is the force of attraction between the Earth and objects pulling them down?

Pulls a baseball to the ground after it has been hit.

What is an example of Gravity?

Friction

What is the force that resists motion between two surfaces pushed together?

Once you stop pushing your bike pedals, your bike will slow down .

What is an example of friction?

When forces have different sizes and direction. They are best illustrated by arrows.

What does it mean when force is called a "vector"?

Net Force

What is the overall force action on an object when all of the forces are combined?

Acceleration

What measures the change in an object's velocity over time?

Balanced

What is the sum of all forces that are equal. DOES NOTchange the motion of an object?

Unbalanced

What is the sum of all forces that are NOT EQUAL.DOES change the motion of an object?

Inertia

What is the resistance of an object to a change in its speed of the direction of its motion?

Newton's First Law

What law does any object at rest stay at rest and any object in motion will remain in motion until acted upon by an outside force?

Newton's Second Law

What law's acceleration will increase if the force applied increases but will decrease with a higher mass?

Newton's Third Law

What law is at anytime one object exerts a force on another object, the second object exerts an equal force back in the opposite direction?

Force=mass x acceleration

What equation is used to measure force in Newton(N). The amount of force needed to accelerate an object with a certain mass?

Forces Act in Pairs

What happens when an inflated balloon in released, the air leaving the balloon pushes(action) and the surrounding air pushes back on the

ballon causing it to move(reaction)?

ballon causing it to move(reaction)?

Newton's Third Law

What law is it if you exert a force on the pedals, the pedals push back on you?

Newton's Second Law

What law is it when the heavier a person, the more force they will need to increase their acceleration?

Newton's First Law

What law is it if you stopped pedaling, the bike would keep going until something stops it. If the bike stops quickly then the rider will keep going over the handlebars?

Newton's Second Law

What law is it if a car was to stop suddenly, the seatbelt would need more force to stop a heavier person that a lighter person?

Newton's First Law

What law is it when the car stops, the rider will keep moving because of inertia unless the seatbelt stops them?

Newton's Third Law

What law is it if you are hit by a bumpercar, the reaction is your car will push back on the second car, pushing it backwards?

Feather

Pencil

Book

Large rock

Pencil

Book

Large rock

List the following objects in order form the one with the least inerita to the one with the most inertia: feather, large rock, pencil, and a book.

Balanced Forces

What is an object that will remain still or the object will remain at the same velocity?

Unbalanced Forces

What is an object that will see a change in its motion?

No Forces

What is an object that will not move or the object will remain at the same velocity?

Reference Point

What is a location to which you compare another location?

You can use an object that is still like the tracks, the station, nearby buildings, or trees.

You are on a train waiting to depart the station. Give a frame of reference you could use to prove that your train is moving.

Speed

What measures the change in postion over a period of time?

S=D/T

What is the formula for speed?

Mph or m/s

What is the two most commonly expressed units for speed?

Greater

Further

Slower

Further

Slower

An object with a _________ speed will travel a _________distance in the some amount of time than an object with a __________ speed.

S=8 m/s

Calculate the speed of a runner who covers 400m in 50 sec.

Speeds up

Slows down

Changes direction

Slows down

Changes direction

What does an object experience when acceleration is being applied?

A= Final velocity-Initial velocity / time

What is the formula for acceleration?

T= 1.5 hr

How long will it take a car traveling at 60 mph to travel 90 miles?

A= 0.1 m/s squared

A man walking a 0.6 m/s accelerates to a velocity of 0.7 m/s second. Calculate his acceleration.

A= -3 mi/hr/s

A biker traveling at 15 mph comes to a complete stop in 5 seconds. Calculate his acceleration.

F=m x a

What is the formula for force?

F=5N

Calculate the force needed to accelerate a 10kg box at a rate of 0.5% m/m/s