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 A push or pull on an object.  Described by:  A force gives an object energy to: STRENGTH DIRECTION STOP MOVING START MOVING CHANGE DIRECTION.

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Presentation on theme: " A push or pull on an object.  Described by:  A force gives an object energy to: STRENGTH DIRECTION STOP MOVING START MOVING CHANGE DIRECTION."— Presentation transcript:

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5  A push or pull on an object.  Described by:  A force gives an object energy to: STRENGTH DIRECTION STOP MOVING START MOVING CHANGE DIRECTION

6  Contact Force  Non Contact Force

7 How do these relate to the title of this lesson? (Gravity and Friction?) Contact = friction Noncontact = gravity  Contact  Noncontact

8  A push or pull on one object by another that is touching it.  Contact forces can be:  Strong OR  Weak

9  A force that one object can apply to another object without touching it.  Examples Include:  Gravity  Magnetic Force  Electric Force

10  can be used to show forces.  The of an arrow shows the of the force.  The that the arrow points shows the direction in which the  The stronger the force the the arrow. ARROWS DIRECTION LENGTH STRENGTH FORCE WAS APPLIED LONGER

11  The SI unit for force is the  The symbol for Newton is  One Newton = about the force you exert to lift a lime.  Named after: NEWTON N Sir Isaac Newton (founder of physics)

12  An attractive force that exists between all objects that have mass.  On EARTH the force of gravity = 9.8 m/s 2  All objects fall to the Earth at an acceleration of 9.8m/s 2 due to the force of gravity.

13  Sir Isaac Newton (1600’s)  The law states:  Factors Affecting Gravity MASS DISTANCE All objects are attracted to each other by a gravitational force. The strength of force depends on the MASS of each object and the DISTANCE between them.

14  The amount of matter in an object.

15  When the mass of one or both objects the gravitational force between them also  Regardless of the amount of mass an object has the will be the  Each object exerts the attraction on the other object. INCREASES FORCE ARROWSSAME SIZE SAME

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17  The attraction between objects as the between the object DECREASES DISTANCE INCREASES

18  The gravitational force exerted on an object.  Weight is measured in  Near Earth’s surface the object’s weight is the NEWTONS FORCE DUE TO GRAVITY

19  Weight and mass are related, but ARE NOT the same.  Weight can due to  Mass change FORCE = CHANGE GRAVITY DOES NOT MASS x ACCELERATION F = Weight on Earth = M x A MASS x 9.8m/s 2 (acceleration due to the force of gravity)

20  What would an object with a mass of 10 kg weigh?  If your mass was 50kg, what would your weight be?

21  The combination of all the forces acting on an object.  To calculate the net force: ◦ If the forces act in the same direction they are added together. ◦ If forces act in opposite directions they are subtracted.

22  Forces acting on an object that combine and form a net force that is not zero.  Unbalanced forces cause an object to move.  Forces moving in the same direction are  Forces moving in the opposite direction are ADDED SUBTRACTED

23  Forces acting on an object that combine and form a net force of ZERO. NO change in motion.

24  A force that resists the motion of two surfaces that are touching.  Types of friction STATIC FRICTION SLIDING FRICTION FLUID FRICTION

25  Friction that acts on objects that are not moving.

26  When solid objects slide over each other.

27  A force produced by a fluid (gases or liquids) Examples: engine oil, grease  Air resistance  Air resistance is affected by: *objects with more surface area have more air resistance** SHAPE SIZE MASS a type of fluid friction Upward force exerted on falling objects.

28 2 causes of friction  When microscopic dips and bumps that cover surfaces slide past another surface with dips and bumps they catch on to one another.  When a positive charge slides by a negative charge attraction occurs.


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