Science Ch. 12.1-12.2

Question 0

Explain Newton’s 1st Law of Motion

Law of Inertia

Answer 0

An object in rest stays at rest, and object in motion stays in motion at a constant in straight line unless acted on by outside, unbalanced force.

Question 1

What is force?

Answer 1

A push or pull that acts on an object.

Question 2

What is a newton?

Answer 2

The SI unit for force, equal to force that causes 1-kilogram/1-second squared.

Question 3

What is net force?

Answer 3

The overall force acting on an object after all the forces are combined.

Question 4

What is the difference between balanced force and unbalanced force?

Answer 4

Balanced force-the net force of an object is zero and it doesn’t move.
Unbalanced force-when acted on an object after motion,it accelerates.

Question 5

What is friction?

Answer 5

A force that opposes the motion of objects that touch as they move past each other.

Question 6

What are all of the types of frictions?

Answer 6

Static-a friction that acts on an object that doesn’t move(strongest)
Sliding-a friction force that opposes the motion of an object as it slides
Rolling- friction that acts on rolling objects,caused by shape at contact

Question 7

What is fluid friction?

Answer 7

Friction that opposes the motion of objects through fluid.

Question 8

What gravity?

Answer 8

The attraction between any two objects due unto their mass. It is also a force that pulls you or and object down to earth’s core.

Question 9

What is air resistance?

Answer 9

Fluid friction acting on an object through air. It’s a force that pulls you or an object upward.

Question 10

What is terminal velocity?

Answer 10

The constant velocity of a falling object when the force of air resistance equals the force of gravity.

Question 11

What is projectile motion?

Answer 11

The curved path of an object in free fall after it is given an initial forward force or velocity.

Question 12

Who was Galileo Galilei?

Answer 12

He was an Italian scientist that concluded that moving objects not subjected to friction or any other force would continue to move indefinitely. He also experimented to find out about the world.

Question 13

Who was Aristotle?

Answer 13

He was an Ancient Greek scientist and philosopher that made many scientific discoveries through his carful work. He incorrectly proposed that force is required to keep an object moving at a constant speed.

Question 14

What is inertia?

Answer 14

The tendency of an object to resist change in motion.

Question 15

What is the difference between mass and weight?

Answer 15

Mass-the measure of the interim of an object

Weight-the force of gravity on an object

Question 16

What is Newton’s 2nd Law of Motion

Hint: acceleration

Answer 16

An unbalanced force acting on an object causes it to accelerate. Also, acceleration of an object is the same as the direction as the force as is directly proportional with the size of the force. However weight is inverse.

Question 17

What is the equation for acceleration?

Answer 17

Acceleration= Net force/Mass

Question 18

What is the the equation fore weight?

Answer 18

Weight= Mass • Acceleration

Question 19

How do your mass and weight relate to each other when going from earth to the moon?

Answer 19

Your mass always stays the same no matter where you are, but you would weight less on the moon because the moon is smaller therefore less gravity to pull you down.

Question 20

What are two ways acceleration can be increased?

Answer 20

By changing the speed,direction,or both.

Question 21

What is Newton’s 3rd Law?

Answer 21

Whenever an object releases force on another object, the other object releases the same amount if force that was put on it.