Unit B: Changes in Motion

Question 1

Average Speed

Answer 1

The distance traveled over a specific time.

Question 2

Uniform Motion

Answer 2

Motion in a straight line at a constant speed.

Question 3

Non-uniform motion

Answer 3

Motion with a change in speed, direction, or both.

Question 4

Scalar Quantity

Answer 4

A quantity consisting of magnitude only, not direction.

Question 5

Instantaneous Speed

Answer 5

Speed at an instant of time.

Question 6

Average Velocity

Answer 6

A vector quantity describing the change in position over a specified time.

Question 7

Displacement

Answer 7

A vector quantity describing the length and direction in a straight line from the starting position to the final position.

Question 8

Position

Answer 8

A vector quantity describing the location of a point relative to a reference point.

Question 9

Vector

Answer 9

A quantity consisting of magnitude and direction.

Question 10

Resultant Displacement

Answer 10

The vector sum of individual displacements.

Question 11

Head-to-tail method

Answer 11

A method where the tail of a succeeding vector arrow begins at the head of the preceding vector arrow.

Question 12

Acceleration

Answer 12

The change in velocity over a specific time interval.

Question 13

Sign convention

Answer 13

An agreement about which direction is positive and which is negative.

Question 14

Uniform Acceleration

Answer 14

Acceleration described by a sloping, straight line on a velocity-time graph.

Question 15

Deceleration

Answer 15

The slowing down of an object due to the acceleration vector pointing in the opposite direction as the velocity vector.

Question 16

Reaction Distance

Answer 16

The distance a vehicle travels while the driver is reacting.

Question 17

Braking distance

Answer 17

The distance a vehicle travels from the moment the brakes are first applied to the time the vehicle stops.

Question 18

Mass

Answer 18

The quantity of matter in an object.

Question 19

Newton’s second law of motion

Answer 19

A law stating that an object will accelerate in the direction of the net force.

Question 20

Applied Force.

Answer 20

an external force applied on an object

Question 21

Newton’s first law of motion

Answer 21

A law stating that in the absence of net force, an object in motion will tend to maintain its velocity, and an object at rest will tend to remain at rest.

Question 22

Inertia

Answer 22

The property of an object to resist changes in its state of motion.

Question 23

Impulse

Answer 23

The product of the net force applied to an object and the time interval during which the net force acts.

Question 24

Newton’s Third law of Motion

Answer 24

A law stating that whenever one object exerts a force on a second object, the second object exerts an equal but opposite force on the first object.

Question 25

Law of conservation of momentum

Answer 25

A law stating that if the net force acting on a system is zero, the sum of the momentum before an interaction equals the sum of the momentum after the interaction.

Question 26

Energy

Answer 26

The ability to do work.

Question 27

Law of conservation of energy

Answer 27

when energy changed from one form to another, the total energy of the system remains constant.

Question 28

Kinetic energy

Answer 28

Energy due to the motion of an object.