Mass vs. Weight

# Mass vs. Weight

## Mass vs. Weight

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##### Presentation Transcript

1. Mass vs. Weight

2. Questions • Are some objects harder to get to start moving than others? • Are some objects harder to slow down than others? WHY???

3. Mass vs. Weight • Mass • The amount of matter an object is made up of • Measure of an object’s resistance to motion (inertia) • Measured using a balance • Weight • The pull of gravity on an object • Is a force  units = Newtons • Measured using a scale

4. Mass vs. Weight • As gravitational fields change… • Does an object’s mass change? • Does an object’s weight change? • As gravitational force increases, an object’s… • Weight ______ • Mass ______

5. Calculating Weight • Equation • W = mg • W = weight • m = mass • g= constant • Earth constant -

6. Calculating Weight • Equation • W = m x g • W = weight • m = mass • g= constant • Earth constant - 0.01 N/g - 10 N/kg • Moon constant -

7. Calculating Weight • Equation • W = m x k • W = weight • m = mass • k = constant • Earth constant - 0.01 N/g - 10 N/kg • Moon constant - 0.0017 N/g - 1.7 N/kg

8. Eureka – Weight vs. Mass • https://www.youtube.com/watch?v=xfGll1REu2A

9. Questions • What is the weight on Earth of a 30 kg dog? • How much does a 200 kg boulder weigh on the moon? • How much force is applied to 100 g on Earth? • What is the mass in kg of a 100 N car on Earth? • A 4 kg rock has a weight of 20 N on a random planet. What is that planet’s grav. constant?

10. Questions • If your mass is 100,000 g, what would you weigh on Earth? On the moon? • A gorilla has a weight of 250 N on Earth. What is its mass in kg on the moon? • If you have a mass of 400 kg and the force of gravity on you is 80 N, what is the gravitational constant for the planet that you are on? • If your weight on the moon is 100 N, what is your weight on Earth?

11. Questions • How much mass in kg does a 17 N boulder on the moon possess? • If your weight on the moon is 50 N, what is your mass in grams on Earth? • What is the gravitational constant of the planet BOOMBOOM if a 300 kg hippo has a weight of 900 N?

12. Questions • If your pet tortoise Toodles weighs 150 N on Earth, what is Toodles’ mass in kg on the moon? • A 4 kg rock has a weight of 20 N on a random planet. What is that planet’s grav. constant?