Forces and Friction
Equal forces acting on an object in opposite direction. No motion, object not in motion.
Balanced Forces
This law explains the motion of an object using the mathematical formula: Force (N) = mass x acceleration.
Newton's Second Law of Motion
The ratio between the total distance and the time elapsed of travel.
Average Speed
How do we calculate force of static friction?
•fs= µsN
A 2 kg box rests on a floor. The coefficient of static friction is 0.3. Find the maximum static friction.
5.88 N
Force that produces motion or causes an object to move or change the direction of the object's motion. Nonzero net force!
Unbalanced Force
Objects resist changes to what they are already doing.
Inertia
The force that pulls objects toward the center of the Earth. W=mg, where g is the acceleration due to gravity (9.8 m/s²)
Force of Gravity
How do we calculate coefficient of kinetic friction?
•µs = fs/N
A 2 kg box requires 7.84 N of force to start moving. Find μs.
0.4
When a body or object is forced to move along another surface but the body or object is not moving.
Static Friction
For every action there is an equal and opposite reaction.
Newton's Third Law of Motion
Speed with direction(vector quantity)
Velocity
How do we calculate the acceleration?
a=f/m
A 10 kg box is sliding across a floor. The coefficient of kinetic friction is 0.20. Find the force of kinetic friction.
19.6 N
A force that is exerted on an object by a person or another object.
Applied Force
This occurs when an object speeds up, slows down or changes direction or velocity.
Acceleration
Motion at constant speed in a straight line.
Uniform Motion
How do we calculate the value of Normal foce?
N=wg
A force of 20 N acts on a 4 kg object. Find the acceleration.
5 m/s2
The support force exerted by a surface on an object resting on it. It acts perpendicular to the surface.
Normal Force
A body or object at rest remains at rest unless acted on by another force. A body or object in motion tends to remain in motion until acted on by another force.
What is Newton's First Law of Motion.
Force that pulls all objects towards each other. Example: Earth's attraction to the Sun.
Gravity
how do we calculate the to get the value of coefficient of kinetic friction?
µk=fs/N
A 50 N force causes an object to accelerate at 5 m/s². What is the mass of the object?
10 kg