Gravity T/F Quiz Without any air or an atmosphere, there can be no gravity.

1. Gravity T/F Quiz • Without any air or an atmosphere, there can be no gravity. • The strength of a gravitational force depends on the mass of objects. • ALL objects in the Universe attract each other through gravitational force. • The farther you get from Earth, the less you are affected by its gravity. • When dropped, all objects fall to Earth at a constant rate.

3. Walking on the Moon

4. Salute on the Moon

5. Bloopers on the Moon

6. Kicking on The Moon

7. Why do astronauts wearing heavy space suits bounce around so easily on the moon? Why do you have to exert so much effort just to jump a few centimeters off Earth’s surface?

8. Gravity A force of attraction

9. Gravity • True or false: Gravity is a force that pulls things to the center of Earth. • Is this ALWAYS true?

10. Gravity • Gravity is a force of attraction between objects due to their masses. • All matter has mass, so all objects experience an attraction toward all other objects.

11. Gravity • Law of Universal Gravitation • All objects in the Universe attract each other through gravitational force. • The size of the force depends on the mass of the objects and the distance between them.

12. Gravity • 3 Key Facts: • Gravitational force is small between objects with small masses. This is why you aren’t pulled toward other people.

13. Gravity • 3 Key Facts: • Gravitational force is larger between objects with larger masses. This is why the planets stay in orbit around the sun.

14. Gravity • 3 Key Facts: • Gravitational force decreases as distance increases. The closer you get to Earth (or any other object) the stronger the force of gravity. What’s the opposite?

15. Weight vs. Mass • Weight is a measure of the gravitational force exerted on an object. • Weight changes as gravity changes. • Mass is the amount of matter in an object. • Mass NEVER changes.

16. Weight, Gravity and Mass Complete the sentence below using the following words: Gravity Mass Weight ___________ is determined by ___________ which is caused by an object’s ___________.

17. A map showing the strength of gravity around the globe.

18. A map showing the strength of gravity around the globe.

21. Gravity T/F Quiz • Without any air or an atmosphere, there can be no gravity. • The strength of a gravitational force depends on the mass of objects. • ALL objects in the Universe attract each other through gravitational force. • The farther you get from Earth, the less you are affected by its gravity. • When dropped, all objects fall to Earth at a constant rate. FALSE! TRUE! TRUE! TRUE! ???

22. Acceleration Due to Gravity Gravity • Scientific fact: Due to the force of the Earth’s gravity, when dropped, ALL objects accelerate towards the ground at a constant rate of 9.8m/s/s

23. Acceleration Due to Gravity Gravity Why does the bowling ball fall faster than the feather?

24. Acceleration Due to Gravity Gravity Define air resistance (p. 152) No air!

25. Acceleration Due to Gravity Gravity Will the feather and the bowling ball hit the surface of the moon at the same time? Why do the bowling ball and feather fall so slowly on the moon?

26. Acceleration Due to Gravity Gravity • Scientific fact: Due to the force of the Earth’s gravity, when dropped, ALL objects accelerate towards the ground at a constant rate of 9.8m/s/s • However, due to air resistance caused by the force of friction between the air and the falling object, not all objects on Earth fall at the same rate.