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You pull objects around you with what?
Forces
Forces are any…
Pulls or pushes on an object
Forces between objects that touch are called
contact forces
Forces between objects that don’t touch are called
non contact forces
What are some Non contact forces
Gravity and magnetic forces
Forces have strength and direction, just like
velocity and acceleration
The more mass an object has
the more gravity it pulls on its surroundings with.
The farther apart an object is from other objects,
the less gravity it pulls on its surroundings with.
Mass is measured with what
Kilograms
In the Metric system what is weight measured by
Newtons
Why dont object have weight in space?
Because there is no gravity
What is friction caused by
microscopic dips and bumps in surfaces of things that touch each other, and get stuck when they slide past each other.
What does Atoms and molecules present in all surfaces
electric charges that attract and slow the sliding of one object against another.
How do you reduce friction
lubricant such as soap or motor oil.
what does lubricant such as soap or motor oil do to friction?
It fill in some of the microscopic dips and bumps present in surfaces that touch, making sliding easier.
