Newton's Second Law
The force of gravity is equal to what
Weight
A push or pull that one body exerts on another
force
For every action there is an equal and opposite reaction force
Newton's third law of motion
What force causes an object to resist a change in motion
Inertia
What force opposes the motion of objects
friction
What is the force called that attracts any two objects
Gravity
Forces that are not equal
unbalanced forces
An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by an unbalanced force
Newton's First Law
When the size of an object increase what also increases with it
The object's inertia
What are the four types of friction
Rolling, sliding, static, fluid
A cannonball is shot out of a cannon. Which will have a smaller acceleration, the cannonball or the cannon?
cannon
What happens if the net force acting on an object is zero
The object will not change - stay at rest or continue moving
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional its mass
Newton's 2nd law
Which is harder to start moving, a mouse or an elephant
elephant
Is air resistance a type of fluid friction?
Yes
The acceleration due to gravity on Earth
9.8 m/s 2
What happens to an object if the net force is any nonzero number
The object will speed up or slow down
A more massive object requires more force to accelerate it
Which has more inertia, an 18 wheeler or a sedan
18 wheeler
Which type of friction acts on a non moving object
static friction
Increases as mass increases and distance decreases
Gravity
How do you calculate Net Force
You find the sum of all forces acting on the object
How many laws of motion did Newton write
three
The force provided by the elevator motor to move a 600 N person and the 9000 N elevator upwards
9600 N
A runner's foot pushes off the ground with 150 N of force, what is the reaction force?
the ground pushing off of the person's foot with 150 N