1. Chapter 12.4 Notes Name:
Observations of planets, stars, and galaxies strongly suggest four universal forces exist throughout the universe: 1. 2. 3. 4.

2. Electromagnetic Forces
Chapter 12.4 Notes Name:
Electromagnetic Forces
What force can attract and repel?

3. Electromagnetic Forces
Chapter 12.4 Notes Name:
Electromagnetic Forces
Electromagnetic force is –

4. Electromagnetic Forces
Chapter 12.4 Notes Name:
Electromagnetic Forces
Clothes often acquire electric charges in the dryer.
Clothes with opposite charges tend to cling together.
DOK question:
Construct a model of what this looks like.

5. What force holds the nucleus together?
Chapter 12.4 Notes Name:
Nuclear Forces
What force holds the nucleus together?

6. The strong nuclear force – The weak nuclear force is –
Chapter 12.4 Notes Name:
Nuclear Forces
The strong nuclear force –
The weak nuclear force is –

7. The strong nuclear force is –
Chapter 12.4 Notes Name:
Nuclear Forces
Strong Nuclear Force
The strong nuclear force is –

8. The weak nuclear force is –
Chapter 12.4 Notes Name:
Nuclear Forces
Weak Nuclear Force
The weak nuclear force is –

9. What is Newton’s law of universal gravitation?
Chapter 12.4 Notes Name:
Gravitational Forces
What is Newton’s law of universal gravitation?

10. Gravitational force is –
Chapter 12.4 Notes Name:
Gravitational Forces
Gravitational force is –

11. The Earth, Moon, and Tides A centripetal force is –
Chapter 12.4 Notes Name:
Gravitational Forces
The Earth, Moon, and Tides
A centripetal force is –

12. Chapter 12.4 Notes Name:
Gravitational Forces
The moon’s inertia and the gravitational pull of Earth result in a nearly circular orbit.
DOK question:
Hypothesize what happens to the moon if the earth was not there.

13. Chapter 12.4 Notes Name:
Gravitational Forces
Satellites are used to receive and transmit electromagnetic waves over great distances.
DOK question:
Construct a model of what could be done without a satellite in space.

14. What are the only forces that can both attract and repel?
Chapter 12.4 Notes Name:
Assessment Questions
What are the only forces that can both attract and repel?
electromagnetic forces
centripetal forces
strong nuclear forces
gravitational forces

15. The nucleus of an atom is held together primarily by the
Chapter 12.4 Notes Name:
Assessment Questions
The nucleus of an atom is held together primarily by the
strong force and weak force.
strong force and gravity.
weak force and electromagnetic force.
electromagnetic force and strong force.

16. Which of the following statements about gravitational forces is false?
Chapter 12.4 Notes Name:
Assessment Questions
Which of the following statements about gravitational forces is false?
They are the weakest universal forces.
They act between any two objects.
They become stronger as the distance between two objects increases.
They become weaker as the mass of either two objects decreases.

17. Chapter 12.4 Notes Name:
Assessment Questions
A center-directed force that continuously changes the direction of an object’s motion, making it move in a circle, is called the radial force. True False