Newton's First Law
Newton's First Law of Motion is also known as this.
The Law of Inertia
This is the formula for Newton's Second Law
F = ma
Forces always occur in ________.
Pairs
This is the force on an object due to gravity
weight
This is the force that opposes motion as an object passes through the air
Air resistance
This is what all objects want to do.
Remain at rest or remain in motion
When forces are equal, a smaller mass has a _____________ acceleration.
Larger
What are the action and reaction forces when someone is walking?
Action force: Foot pushes on ground
Reaction force: Ground pushes on foot
This is the difference between weight and mass.
Weight depends on gravity while mass remains the same
Since there is air resistance, what happens to the acceleration of a falling object over time?
Acceleration decreases (to 0 m/s2)
This is the sum of all the forces acting on an object.
Net Force
What unit is force measured in?
Newtons
Equal forces do not have equal effects if the two objects are different ____________.
masses
The force of gravity between two objects depends on these two things.
Distance and mass
Since there is air resistance, what happens to the velocity of a falling object over time?
Velocity increases until the object reaches terminal velocity
This is a measure of inertia
Mass
During a car race, if all cars have the same mass, what is true about the winning car?
It had more force, therefore more acceleration.
An object is harder to stop if it has more of this.
Momentum
When objects of different mass are dropped, at what rate do they all fall to the ground?
9.8 m/s2
If an object stays in freefall around another object, it is ___________ the other object.
Orbiting
Give a real life example of inertia.
Car turns, you continue in the same direction. No seatbelt, car stops, you continue in the same direction.
During a race if two cars cross the finish line at the same time, but they had different masses, what must be true?
One had more force than the other.
Some or all of an object's momentum can be transferred to another object because of this law.
Law of Conservation of Momentum
This is the motion of an object when only the force of gravity is acting on a body.
Freefall
The velocity of the horizontal component projectile motion is a ____________.
Constant