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Forces & Motion

Forces & Motion. Inertia . Inertia- The amount of force needed to move an object. How Can Unbalanced Forces Affect Objects?. Acceleration is caused by unbalanced forces: slow down speed up stop start change direction change shape

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Forces & Motion

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  1. Forces & Motion

  2. Inertia • Inertia- The amount of force needed to move an object.

  3. How Can Unbalanced Forces Affect Objects? • Acceleration is caused by unbalanced forces: • slow down • speed up • stop • start • change direction • change shape • In your notes, describe an example of an unbalanced force affecting an object.

  4. Mass and Weight • Mass is the amount of stuff (matter) in an object. • The mass of an object will remain the same anywhere in the universe. • Mass is measured in grams or kilograms. • Weight is the mass (kg) of an object multiplied by the acceleration of gravity (9.8 m/s2). • The weight of an object depends on the gravitational pull of the location in the universe. • The gravitational pull on the Moon is only 1/6 of Earth’s gravitational pull. • Weight is measured in newtons (N).

  5. Mass and Weight Example: F=ma A person with a mass of 25 kg x 9.8 m/s2 gravitational acceleration is equal to 245 N of weight force. F= 25 kg x 9.8 m/s2 F = 245 N The person exerts 245 N of force on the ground. If the person went to the Moon, they would only weigh 1/6 of 245 N.

  6. Force Force (N) = mass (kg) x acceleration (m/s2) F ÷ m xa

  7. Force Acceleration (m/s2) = force (N)÷ mass (kg) F ÷ m xa

  8. Force Mass (kg) = force (N)÷ acceleration (m/s2) F ÷ m xa

  9. Practice The acceleration of a sprinter is 10 m/s2. The force exerted on the starting blocks is 650 N. What is the mass of the sprinter? Force = Mass = Acceleration =

  10. Check Your Answer The acceleration of a sprinter is 10 m/s2. The force exerted on the starting blocks is 650 N. What is the mass of the sprinter? Force = 650 N Mass = 65 kg Acceleration = 10 m/s2 Mass = force ÷ acceleration Mass = 650÷ 10 Mass = 65

  11. Practice A 50 kg cart is accelerating at 15 m/s2. Calculate the force exerted on the cart? Force = Mass = Acceleration =

  12. Check Your Answer A 50 kg cart is accelerating at 15 m/s2. Calculate the force exerted on the cart? Force = 750 N Mass = 50 kg Acceleration = 15 m/s2 Force (N) = mass (kg) x acceleration (m/s2) Force = 50 x 15 Force = 750

  13. Practice A boat is pulling a 54 kg wake boarder. She accelerates at 2 m/s2. Calculate the force that is causing the acceleration. Force = Mass = Acceleration =

  14. Check Your Answer A boat is pulling a 54 kg wake boarder. The force the boat is exerting on her is 108 N. Calculate her acceleration. Force = 108 N Mass = 54 kg Acceleration = 2 m/s2 Acceleration = force ÷ mass Acceleration = 108 ÷ 54 Acceleration = 2

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