Transcript Chapter 2: Force & Newton`s Laws

Chapter 2: Force & Newton’s Laws
What is a balanced force?

Forces that are equal in size but
opposite direction.
What would happen to a ball that was thrown
horizontally if there was NO gravity?

The ball would continue to travel
horizontally.
How does air resistance change as
you move faster?

Air resistance increases.
What is static friction?

Static friction is the force that you have
to overcome in order to move an object.
What force always acts in an opposing direction
of a moving object?

Friction
What causes a feather to fall more
slowly than a brick?

Air resistance
What is inertia?

The tendency of an object to resist any
change in motion.
What is a force?

A force is a push or pull that one object
exerts on another.
What direction does friction travel in
relationship to a moving object?

Friction travels in an opposite direction of
a moving object.
What causes a ball to experience
vertical acceleration?

Gravity
What happens to the acceleration of
an object if you double the net force?

The acceleration doubles.
Short Answer

Give an example of rolling friction and
sliding friction. Which would allow you to
move an object more easily?
Short Answer

Give an example of you moving an
object and have to overcome static
friction and then how sliding friction
comes into effect.
Newton’s Three Laws
Describe each law.
 Where do we see each law?
 What forces are present in each law?

Labs

Go over each of our labs and make a
connection from that lab to the concept
we were learning in class.
Calculations

What is the force?
m = 15 kg
a = 3 m/s2
Answer: 45 N
Calculations

What is the mass?
F = 2000 N
a = 40 m/s2
Answer: 50 kg
Calculations

What is the acceleration?
F = 150 N
m = 25 kg
Answer: 6 m/s2