Law 1
Newtons first law is known as the law of
inertia
What is newtons second law?
F=ma
for every action their is an equal and opposite reaction
What is the weight of a 2kg box sitting on a shelf?
w=mg
w= (2kg)(9.8m/s2)=19.6N
you sitting in seat
Normal and gravity balanced
a push or pull
force
How do we visualize the external forces acting on a object
Free body diagrams
When you push against the wall, the wall pushes back on you with an equal and opposite force
Why do these forces not cancel out?
the forces are acting on different bodies
you on wall
wall on you
A ball moves rightward with a constant velocity after being kicked with 200N force. What is the net force?
0, constant velocity
an egg falls from a nest in a tree
gravity, air resistance optional
the study of the cause of motion
dynamics
Newtons second law states that acceleration is __________________proportional to the Net Force
directly
The pulling force that acts along a stretched flexible connector, such as a rope or cable
tension
A 6kg block of wood accelerates on the tabletop after an applied force of 150 N, the coefficient of friction between the wood block and tabletop is .3, what is the force of friction?
ff=17.64
a ball accelerates leftward after being kicked
Fapplied greater vector arrow than FF
An object in motion will stay in motion
an object at rest will stay at rest
unless acted upon by unbalanced force
According to newtons second law acceleration is __________________ proportional to the mass
inversely
the force that acts perpendicular to the surface
Normal
A person weighing 55 kg walks by applying 160 N of force on the ground, while pushing a 10-kg object. If the person accelerates at 2 m/s2 , what is the force of friction experienced by the system consisting of the person and the object?
Ff=30N
A gymnast hangs still from two bars
2 tension vectors equal to gravity
adding up of all the forces acting on a body gives the total or
net force
Provide the formula for acceleration using newtons 2nd law
a= Fnet/m
Give a scenario where N=mg
A non accelerating horizontal force
Two people push a 2,000-kg car to get it started. An acceleration of at least 5.0 m/s2 is required to start the car. Assuming both people apply the same magnitude force, how much force will each need to apply if friction between the car and the road is 300 N?
4850 N
A hocky puck slows down as it moves left
Right facing friction vector greater than left facing applied force