Forces and Motion Mandek Richardson University of South Florida STARS Program.

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Presentation transcript:

Forces and Motion Mandek Richardson University of South Florida STARS Program

Vocabulary Friction Gravity Position Speed Velocity Acceleration Momentum

Types of Forces?

Friction – force that opposes motion between 2 surfaces – depends on the: types of surfaces force between the surfaces

Friction Friction is greater... – between rough surfaces – when there’s a greater force between the surfaces (e.g. more weight)

Gravity – force of attraction between any two objects in the universe – increases as... mass increases distance decreases

Gravity Who experiences more gravity - the astronaut or the politician? less distance more mass  Which exerts more gravity - the Earth or the moon?

Gravity Weight – the force of gravity on an object MASS always the same (kg) WEIGHT depends on gravity (N) W = mg W:weight (N) m:mass (kg) g:acceleration due to gravity (m/s 2 )

Gravity Would you weigh more on Earth or Jupiter? greater gravity greater weight greater mass  Jupiter because...

Position The location of an object in space and it always depends on a frame of reference

Speed and Velocity Speed is the distance an object travels in a certain amount of time – Tells you how quickly or slowly something is moving

Speed and Velocity Velocity is the measure of an objects speed in a certain direction – Must know a direction something is moving to know its velocity 5 miles/hr, east 5 miles/hr, north 5 miles/hr, west

Acceleration How fast an object’s velocity changes over time An object accelerates when it slows down or speeds up

Newton’s First Law Newton’s First Law of Motion – 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 Second Law Newton’s Second Law of Motion – The acceleration of an object depends on the object’s mass and the force applied to it F = ma

Newton’s Third Law Newton’s Third Law of Motion – When one object exerts a force on a second object, the second object exerts an equal but opposite force on the first.