Chapter 10 Vocab

Question 1

Motion

Answer 1

An object’s change in position relative to a reference point

Question 2

Reference point

Answer 2

Zero location in a coordinate system or frame of reference

Question 3

Displacement

Answer 3

The change in position of an object

Question 4

Speed

Answer 4

The distance traveled divided by the time interval during which the motion occurred

Question 5

Average speed

Answer 5

Is calculated as distance divided by time. Speed= distance/time
V=d/t

Question 6

Instantaneous speed

Answer 6

The speed at a given point in time.

Question 7

Velocity

Answer 7

The speed of an object in a particular direction

Question 8

Resultant velocity

Answer 8

Combine velocities to determine the resultant velocity.

Resultant velocity is all the velocities combined.

Question 9

Acceleration

Answer 9

The rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.

Question 10

Centripetal acceleration

Answer 10

The idea that any object moving in a circle will have an celebration vectors pointed towards the center of that circle. This is true even if the object is moving around the circle at a constant speed.

Question 11

Constant acceleration

Answer 11

A change in velocity that doesn’t vary over a given length of time.

Question 12

Force

Answer 12

An action exerted in a body in order to change the body’s state of rest or motion; force has magnitude and direction.

Question 13

Net force

Answer 13

The overall force acting on an object.

Question 14

Balanced forces

Answer 14

Do not cause an object at rest to start moving. Balanced forces do not cause a change in motion of a moving object.

Question 15

Unbalanced forces

Answer 15

Unbalanced forces occur when two forces acting on an object are not equal in size, causing a change in motion. They can cause a still object to move, or moving objects to slow down or speed up, stop, or change direction

Question 16

Friction

Answer 16

A force that opposes motion between two surfaces that are in contact.

Question 17

Sliding friction

Answer 17

When objects slide past each other, the friction that occurs is called sliding friction

Question 18

Rolling friction

Answer 18

If a round object rolls over a flat surface, the friction is called rolling friction. Rolling friction is usually less than sliding friction.

Question 19

Fluid friction

Answer 19

Any object moving through a fluid such as air encounters friction between the air and the surface of the moving object.

Question 20

Static friction

Answer 20

The force that resists the initiation of sliding motion between two surfaces that are in contact and at rest.

Question 21

Kinetic friction

Answer 21

The force that opposes the movement of two surfaces that are in contact and are sliding over each other.