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4.4 2017 > Definitions > Flashcards

Flashcards in Definitions Deck (15)
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1
Q

Define a scalar.

A

A quantity with a magnitude but NO direction.

2
Q

Define a vector.

A

A quantity with both a magnitude and a direction.

3
Q

Define speed.

A

The rate of change of position

4
Q

Define velocity

A

The rate of change of displacement

5
Q

Define acceleration

A

The rate of change of velocity

6
Q

Define weight.

A

The gravitational force upon an object.

7
Q

Define friction.

A

The force that opposes motion.

8
Q

Define Newton’s First Law.

A

If the sum of the forces is zero, the object will move at constant speed (or be stationary).

9
Q

Define Newton’s Second Law.

A

The acceleration of an object is proportional to the net force on that object.

10
Q

Define Newton’s Third Law

A

Every force has an equal, but opposite, force acting in opposition to it.

11
Q

Define Work

A

A transfer of energy

12
Q

Define an unbalanced force

A

The total force on an object

13
Q

Define braking distance

A

The distance a car travels from the moment the brakes are applied to when the car comes to a full stop

14
Q

Define thinking distance

A

The distance a car travels from the moment the driver sees the obstacle to when the brakes are applied.

15
Q

Define the stopping distance

A

Thinking distance + Braking distance