Science Ch.12.3-12.4

Question 0

What is Law of Conservation of Mass?

Answer 0

Law stating that the total momentum of a system does not change if no net force acts the system.

Question 1

What is momentum?

Answer 1

The product of an object’s mass and it’s velocity.

Question 2

What is centripetal force?

Answer 2

A force that continuously changes the direction of an object to make it move in a circle.

Question 3

What is weak nuclear force?

Answer 3

A powerful attractive force that act over a short range

Question 4

What is gravitational force?

Answer 4

An attractive force that acts between any two objects.

Question 5

What is electromagnetic force?

Answer 5

A force associated with charged particles, which has two aspects, electric force and magnetic force.

Question 6

What is strong nuclear force?

Answer 6

The powerful attractive force that binds protons and neutrons together in the nucleus.

Question 7

What is momentum measured in?

Answer 7

Kg•m/s

Kilograms•meters per second

Question 8

What two things are multiplied to calculate to momentum?

Answer 8

Mass and velocity

Question 9

According to Newton’s third law of motion, what happens whenever one object exerts a force on a second object?

Answer 9

Whenever one object releases force on another that object releases the same amount of force back.

Question 10

The equal and opposite forces described by Newton’s third law are called ______ and _______ forces.

Answer 10

Action and reaction

Question 11

What are the two factors that affects the momentum of a moving object?

Answer 11

Mass and velocity

Question 12

If two identical objects are moving at different velocities, the object that is moving faster will have _______ momentum.

Answer 12

Greater

Question 13

If an object is not moving then what is it’s momentum?

Answer 13

0 kg•m/s

Question 14

What is formula momentum?

Answer 14

Momentum(kg•m/s)=mass(kg)•velocity

(m/s)

Question 15

Is the true or false? Objects within a closed system can exert forces on one another, but other objects and forces cannot leave or enter the system.

Answer 15

True

Question 16

What is difference between strong and week nuclear forces?

Answer 16

Strong-acts on the particles neutrons and protons, acts at very short distance,very strong(100 times stronger than an electric force)
Weak-acts on all particles, acts on a short distance, and weaker than the strong force

Question 17

What are the four universal forces?

Answer 17

Electromagnetic, strong nuclear, weak nuclear, gravitational

Question 18

Name the only two forces that can both attract and repel.

Answer 18

Electric and magnetic

Question 19

What evidence suggests that nuclear forces have a powerful force of attraction?

Answer 19

They hold nucleus together

Question 20

State Newton’s law of universal gravitation.

Answer 20

Every object in the universe attracts every other object in the universe.

Question 21

The gravitational force of attraction between two objects depends on ______ and _______.

Answer 21

Mass and distance

Question 22

The sun’s mass is much greater than the mass of Earth, so the sun’s gravitational force is much _______ than that of Earth.

Answer 22

Stronger

Question 23

Is this true or false? The gravitational pull of the moon is the primary cause of Earth’s ocean tides.

Answer 23

True

Question 24

List four uses of artificial satellites.

Answer 24

• monitor Earth’s weather
• create detailed radar maps of Earth’s surface
• use telescopes to gaze into space
• receive and transmit cell phone and satellite television signals

Question 25

Why does the moon continue is circular path around Earth?

Answer 25

Because of centripetal force