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Forces Power Point

- 3. A push or pull on an object. Described by: •STRENGTH •DIRECTION A force gives an object energy to: •STOP MOVING •START MOVING •CHANGE DIRECTION
- 4. 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)
- 5. Contact Force Non Contact Force
- 6. A push or pull on one object by another that is touching it. Contact forces can be: Strong OR Weak Example: FRICTION= force that opposes motion between two surfaces in contact.
- 7. A force that one object can apply to another object without touching it. Examples Include: Gravity- universal attraction between all objects. Magnetism- attracts and repels objects
- 8. An attractive force that exists between all objects that have mass. ◦ Weight is a measure of the force of gravity acting upon an object. On EARTH the force of gravity = 9.8 m/s2 All objects fall to the Earth at an acceleration of 9.8m/s2 due to the force of gravity.
- 9. The amount of matter in an object.
- 10. Weight and mass are related, but ARE NOT the same. CHANGE GRAVITY Weight can due to Mass change DOES NOT
- 11. can be used to show forces. ARROWS LENGTH The of an arrow shows the of the force. STRENGTH DIRECTION The that the arrow points shows the direction in which the FORCE WAS APPLIED LONGER The stronger the force the the arrow.
- 12. 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. DO THE MATH pg 191, #13. Do with shoulder partner.
- 13. Forces acting on an object that combine and form a net force of ZERO. NO change in motion.
- 14. 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 ADDED Forces moving in the opposite direction are SUBTRACTED
- 15. FORCE= MASS x ACCELERATION F= ma Force measured in NEWTONS Mass measured in KILOGRAMS Acceleration measured in M/S2 DO THE MATH pg 195….RACE!
- 16. Weight and mass are related, but ARE NOT the same. Weight can due to CHANGE GRAVITY Mass change DOES NOT F = Weight on Earth = M x A MASS x 9.8m/s2 (acceleration due to the force of gravity)