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# Forces

Forces are a push or a pull on an object
Newton's First Law an object in motion remains in motion unless acted upon by an unbalanced force (forces are balanced)
Newton's Second Law force is directly related to an object's mass and acceleration (forces are unbalanced)
Newton's Third Law For every action there is an equal and opposite reaction
Example of Newton's First Law A car going a constant speed
Example of Newton's Second Law A car accelerating
Acceleration when an object speeds up, slows down, or changes direction
Example of Newton's Third Law Gases of rocket push ground down and ground pushes gases of rocket up.
A toy car has a 5 N applied in the forward direction as well as a frictional force of 2 N. What is the net force acting on the car? 3 N
What is the acceleration of a 10 kg object that has a force of 20 N? 2 m/s^2
If a ball is hit with 4x the force, it will result in _______ the acceleration? 4x
If an object is accelerating its net force is? Not 0 N
What is the relationship between mass and acceleration? inverse or indirect
Weight is ______. force of gravity on an object
A 0.02 kg piece of gum hits a paper projectile with a 1 N force. If the projectile is now traveling at a constant velocity, what is its acceleration 0 N
If a 100 kg female traveled to the moon where gravity is 1/6th of the Earth's gravity (g of moon= 1.63 m/s^2), how much would she weigh? 163 N
If a ball has a mass of 30 N on the Earth, what is it's mass on the moon (g of moon = 1.63 m/s^2) 30 N
What is the unit of force? N
What is the unit of mass? kg
What is the unit of acceleration? m/s^2
What is the unit of speed? m/s
What is another way to write the unit of a Newton? kg*m/s^2
What do call the force that is perpendicular to the surface? Normal Force
The opposite of the thrust force on an airplane is the _____. drag force
The opposite of the weight force on an airplane is the _____. lift force
True or False: A force is any interaction that changes and object's motion. True
True or False: A force is necessary to continue an object's motion. False
Created by: NISD Physics