Friction
What are the 4 types of friction?
Static, Rolling, Sliding, Fluid
Playing tug of war where both teams have equal numbers and equal strength is an example of a(n)....
Balanced Force
How many laws make up Newton's Laws?
3
What force keeps us planted on the ground? (Why do we not float off into space when we jump?)
Gravity
Define:
Inertia
Tendency for an object to resist motion
Identify the type of friction:
A refrigerator sitting on the floor
Static
Identify if the situation shows a balanced or unbalanced force:
A 4 year old is on a seesaw with his dad. His dad is always on the ground and he is always in the air.
Unbalanced
Identify the Law:
An object in motion stays in motion and an object at rest stays at rest unless it is acted upon by a force.
1st Law
Which item would have a stronger gravitational pull?
A book or a feather
Book
Define:
Force
A push or pull applied to an object
Identify the type of friction:
A fish swimming in a fish tank
Fluid
Identify if the situation shows a balanced or unbalanced force:
A scientist is using a balance scale to weigh 50 pounds of tissues and 50 pounds of books.
Balanced
Identify the Law:
For every action there is an opposite and equal reaction
3rd Law
True or False:
If I kick a soccer ball the ball would have horizontal motion, but no vertical motion.
False
Define:
Net Force
When 2 or more forces act on an object at the same time
Identify the type of friction:
A child riding a bicycle on the sidewalk
Rolling
Identify if the situation shows a balanced or unbalanced force:
2 brothers are fighting over a toy, there is no movement of the toy.
Balanced
Identify the Law:
When a force acts on an object, the object accelerates in the direction of the force
2nd Law
Weight is the gravitational force exerted on an object. What is this measured in?
Newtons
Define:
Projectile
Anything that is thrown or shot through the air
Identify the type of friction:
A hockey player skating on the ice
Sliding
Identify if the situation is an example of a balanced or unbalanced force:
I drop my pencil and gravity pulls it to the ground
Unbalanced
Which law is also known as the law of inertia?
1st Law
Gravity depends on two things. What are those two things?
Mass and distance between objects
Friction
The force that opposes the sliding motion of two touching surfaces