Unit 4

Question 0

Net force

Answer 0

Sum of all of the forces that are acting on an object

Question 1

Force

Answer 1

A push or pull exerted on an object.

Question 2

Friction

Answer 2

Force that opposes the sliding motion between two touching surfaces

Question 3

Gravity

Answer 3

Attractive force between two objects that depends on the masses of the object and the distance between them

Question 4

Field

Answer 4

A region of space in which every point has a physical quantity, such as a force

Question 5

Weight

Answer 5

Gravitational force exerted on an object

Question 6

Newton’s first law of motion

Answer 6

States that an object moving at a constant velocity keeps moving at that velocity unless an unbalanced force acts on it

Question 7

Inertia

Answer 7

Tendency of an object to resist any change in its motion

Question 8

Newton’s second law of motion

Answer 8

States that the acceleration of on object is in the same direction as the net force on the object, and that the acceleration equals the net force divided by its mass

Question 9

Newtons third

Answer 9

States that when one object exerts a force on a second object, the second object exerts a force on the first object that is equal in strength and in the opposite direction

Question 10

Air resistance

Answer 10

Force that opposes the motion of objects that move through the air

Question 11

Terminal velocity

Answer 11

The maximum speed on object will reach when falling through a substance, such as air

Question 12

Free fall

Answer 12

Describes the fall of an object on which only the force of gravity is acting

Question 13

Centripetal force

Answer 13

A force that is directed toward the center of a curved or circular path

Question 14

Law of conservation of momentum

Answer 14

States that if no external forces act on a group of objects, their total momentum does not change