flashcards

2 Science Chapter 2 Forces

Question Answer
air resistance friction caused by movement through air
balanced equal forces acting on an object
centripetal force force that causes an object to move in a circle
FLUID friction friction caused by movement through a FLUID
force a push or pull on an object
free fall the motion of an object caused by gravity
friction the force that one surface exerts on another surface as they touch
gravity the force that pulls objects toward each other
inertia the tendency of an object to resist change in motion
Law of Conservation of Momentum states the total momentum of colliding objects does not change
mass the amount of matter in an object
momentum the product of an object's mass and velocity
net force the overall force caused by several forces acting on an object
Newton the unit for force
projectile an object that is thrown
rolling friction friction that occurs when an object ROLLS over a surface
satellite an object that travels around another object
sliding friction friction that occurs when one object SLIDES over another
terminal velocity the maximum velocity a falling object can achieve
unbalanced force a net force which changes an object's motion
weight the force of gravity on an object at the surface of a planet
The tendency of an object to resist change in its motion is known as… inertia
According to the Law of Conservation of Momentum, when two objects collide in the absence of friction, momentum is not lost
Any force that causes an object to move in a circle is called … centripetal force
The greater the mass of an object, the greater its inertia
Give an example of rolling friction – bike tires on the road as you ride
When the only force acting on a falling object is gravity, the object is said to be… in free fall
The total momentum of a group of objects is conserved unless… outside forces act on the objects
The SI unit for force is the … Newton
The achievement of lifting a rocket off the ground and into space can be explained by… Newton's Third Law
The force that one surface exerts on another when the two rub against each other is called… friction
How can you increase the momentum of an object? by increasing its mass
Forces can be added together only if they are… acting on the same object
The product of an object's mass and velocity is called its… momentum
What is required for a rocket to lift off into space? thrust that is greater than Earth's gravity
The force of gravity on a person or object at the surface of a planet is known as… weight
Objects falling through AIR experience a type of friction called.. AIR resistance
An object that travels around another object in space is called a… satellite
According to Newton's Third Law of Motion, when a hammer strikes and exerts force on a nail, the nail… exerts an equal force back on the hammer
The force that pulls falling objects toward Earth is called… gravity
What is an example of exerting a force? a carpenter hammering a nail
The Law of Universal Gravitation states that any two objects in the universe, without exception… attract each other
The momentum of an object is in the same direction as its… velocity
Balanced forces acting on an object… never change the object's motion
The force of gravity on a person or object on the surface of a planet is called… weight
The amount of matter in an object is called its… mass
What happens when two forces act in the same direction? They act together
What is an example of increasing friction intentionally? throwing sand on an icy driveway
One way to increase acceleration is by.. decreasing mass
In physical science, a push or a pull is called a… force
Air resistance is a type of… friction
Determine FORCE if mass and acceleration are known: F = m x a; label is N
Determine MASS if force and acceleration are known: M = F/a; label is kg
Determine MOMENTUM if mass and velocity are known: MOM = m x v; label is kg.m/s
Determine MASS if momentum and velocity are known: M = Mom/v; label is kg
Determine VELOCITY if mass and momentum are known: v = Mom/m; label is m/s
Determine velocity of a dropped object (FREE FALL) if time is known: s = Ag x t; label is m/s
Determine the WEIGHT of an object if mass is known: w = m x Ag; label is N
What is Ag? Acceleration due to gravity = 9.8 m/s2

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