# Physical Science Final Exam #2

### 61 terms by Physical-Science

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### A passenger in the rear seat of a car moving at a steady speed us at rest relative to?

The front seat of the car

0

### A person drives north 6 blocks, then turns west, and drives 6 blocks. The driver then turns south and drives 6 blocks. How could the driver have made the distance shorter while maintaining the same displacement?

By driving west 6 blocks from the starting point

4 meters

2 km south

### Speed is the ratio of the distance an object moves to

the amount of the time needed to travel the distance

### Instantaneous speed is measured

at a particular instant

speed

at rest

### vector addition is used when motion involves

more than one direction, velocity, and one speed

acceleration

### What identifies a change in motion that produces acceleration?

a ball moving at a constant speed around a circular track

### Objects in free fall near the surface of the Earth experience

constant acceleration

### What's an example the describes constant acceleration due ONLY to a change in direction?

traveling around a circular track

acceleration

### An object that is accelerating may be

Slowing down, changing direction, and gaining speed.

### What is instantaneous acceleration?

How fast a velocity is changing at a specific instant

### The motion of an object looks different to observes in different...?

Frame of references

meter

Displacement

vectors

### The sum of two or more vectors is called the?

resultant vectors

m/s

### A car's speedometer measures

instantaneous speed

speed

direction

accelerate

gravity

acceleration

speed

curved

positive

### ______ ______ is how fast a velocity is changing at a specific instant.

Instantaneous acceleration

### Mass:

Is the amount of matter in an object, a measure of the inertia of an object, which depends on the amount of matter the object contains

### Weight:

is the force of gravity acting o an object.

### Inertia:

An object that is in motion stays in motion and an object at rest stays at rest as long as the net forces acting on that object are zero

### Newton's 1st Law states:

The law of Inertia

Newtons (N)

w=m.g

kg x m/s(2)

m/s(2)

### Force

Push or pull on an object

### Vector

Magnitude and direction

### List 4 things that are vectors

Velocity, Acceleration, Force, and Gravity

Newton

m/s(2)

1 m/s(2)

km x 1 m/s(2)

### What is a net force?

forces combined when they are acting on an object (they can be pushed or pulled)

balanced force

True

### Formula for Newton's 2nd Law of Motion

acceleration= net force / mass or a=f/m

mass x velocity

kg x m/s

### Newton's Third Law of Motion

For every action there is an equal and opposite reaction.
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

True

True

True

### Law of Conservation

If no net force acts on a system, then the total momentum does not change.

Momentum

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