Friction
The definition of Friciton
What is the force that prevents one solid object from slipping or rolling over another?
Definition of mass
What is the amount of matter present in an object or body?
The givin difinition of force
What is strength or energy as an attribute of physical action or movement?
Force required to stop a moving object
What is a moving object can be stopped by any force as long as it is directed in the opposite direction?
What percent of the engine power of automobiles is consumed in overcoming frictional forces in the moving parts.
What is 20 percent?
What does mass represent
What is the total amount of atoms and particles it contains?
Examples of contact forces
What is muscular force, mechanical force, frictional force?
Three things are required for an object in motion to stop:
What is force, time, and distance?
Fill in the blanks.
Friction between two surfaces causes _______ energy from moving surfaces to be converted into _______ energy.
What is friction between two surfaces causes kinetic energy from moving surfaces to be converted into thermal energy?
True or false
In a nuclear reaction, mass increases and energy decreases
What is false?
Examples of non-contact forces
What is gravitational force, electrostatic force, magnetic force?
Name Newton's laws that connect to stopping
1. Newton's First Law, an item in motion will continue to move unless it is acted with by an external force.
2. Newton's Second Law explains what takes place when an object comes into contact with an external force.
Name the four types are friciton
Static friction
Sliding friction
Rolling friction
Fluid friction
Name three reasons why mass is different from weight
Mass is defined as the amount of matter in a substance and is always constant.
Mass can never be zero.
Mass is commonly measured in kilograms and grams.
Mass doesn’t change according to location.
Mass = Volume x Density
Four effects of force
Force can make a body that is stationary to move.
It can slow down or completely stop a moving body or object.
It can increase the velocity of a moving body.
Force can change the direction of a moving body or object with its shape and size.
Fill in the blanks
_____ + _______ = Stopping distance
What is thinking distance + braking distance = stopping distnace?
Two external factors friction is dependant on
What is...
1. On the nature of the two surfaces that are in contact
2. On the force that is acting on these surfaces
Yes or No
Mass is a quantitative measurement of inertia
What is yes?
Force is the _____ or _____ on an object with mass that causes it to change its velocity (speed)
What is force is the push or pull on an object with mass that causes it to change its velocity (speed)?
A force that slows down an object, regardless of its direction of motion
What is friction?