Newton's Laws
An object’s motion will not change unless a(n) ___ force is applied.
Unbalanced.
What is the formula for speed?
speed=distance/time
What is Friction?
The force that opposes motion between two surfaces that are in contact.
A vector quantity has BOTH of what?
Magnitude and Direction.
What is weight?
The gravitational force acting upon an object
Which one of Newton’s laws applies to everyday life?
ALL of them! Especially Newton’s Second Law… example - stopping something from rolling off a table.
What is instantaneous speed?
The speed of an object at a particular moment in time.
What is the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest?
Static Friction
What is distance?
The amount of ground an object has covered. It is a scalar quantity as well.
What is the definition of free-fall?
When Earth's gravity is the only force acting on an object
What are the TWO equations of Newton’s Second Law?
Net Force = mass / acceleration and F = ma
What is the formula for acceleration?
Final speed - initial speed divided by time
What are the four types of friction?
Kinetic, Sliding, Rolling, and Static
An example of a contact force is ___
Friction.
What is a Balanced Force?
A force that has a net force of zero and causes an object to stay at a constant speed while in motion. It will also cause an object to stay at rest if forces are balanced.
Which Newton’s law does inertia apply to?
Newton’s First Law.
What is the formula for average speed?
Total distance/ time
What are the three things that affect friction?
Surface roughness, force pushing objects together, and Surface area
The equation of net force is ___
mass times acceleration.
What is the definition of terminal velocity?
When an object falls at a constant velocity because the air resistance and gravitational force balance out
You and your classmates are playing tug-of-war. You’re pulling with all your strength and realize that both sides of the rope aren’t moving. Which one of Newton’s laws does this occurrence apply to?
Newton’s Third Law.
What are the three types of speed and the two types of acceleration?
Instantaneous speed, Average speed, Constant speed, Centripetal acceleration, and Constant acceleration
What is kinetic friction?
The force that opposes the movement of two surfaces that are in contact and are moving over each other.
Is displacement a vector quantity or scalar quantity?
Vector.
What is the definition of frame of reference?
A system for describing the motion of an object relative to the objects around it