Newton's second laws
Calculate the force if a 5 kg object accelerates at 2 m/s2
10N
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 try and resist change
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
net force/unbalanced force
An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force
Newton's First Law
when the size of an object increase what also increases with it
The object's Inertia
If you push a wall with a force of 50 N50 \, \text{N}50N, how much force does the wall exert on you?
The wall exerts an equal and opposite force of 50N.
when there are no outside forces acting on an object besides gravity
Free Fall
What happens if the net force acting on an object is zero
The object's movement will not change or it's at constant speed
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional its mass
Newton's 2 law
An object that is still will only change if acted upon by what
net force
Explain why a swimmer moves forward in water.
The swimmer pushes water backward, and the water pushes them forward.
A rocket of mass 2,000 kg2,000 \, \text{kg}2,000kg experiences a net upward force of 12,000 N12,000 \, \text{N}12,000N. What is the rocket's acceleration? (Ignore air resistance.
a=F/m=12,000/2,000=6m/s2
.
What happens if the net force is any nonzero number
The object will accelerate negatively or positively
If two ice skaters push off each other, what happens? (direction and force)
They move in opposite directions with equal force.
An object with a lot of inertia is likely to do what
Resist change in movement
A hammer hits a nail with a force of 200N. How much force does the nail exert on the hammer?
The nail exerts an equal and opposite force of 200N on the hammer.
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
When a bird flaps its wings downward to lift itself into the air, what are the action and reaction forces?
The action force is the bird pushing air downward with its wings. The reaction force is the air pushing the bird upward.
What is the fastest an object can fall called
Terminal Velocity