# physical science final

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just some terms from the practice final

### a passanger is in the rar seat of a car moving at a steady speed is at rest relative to

the front seat of the car

### which distance can be most accurately measured with a ruler?

the width of a book

1000

0

4 meters

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

the amount of time needed to travel the distance

### instantaneous speed is measured

at a particular instant

148 km/h

speed

### a horizontal line on a distance-time graph means the object is

moving at a constant speed

10 m/s

acceleration

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

constant acceleration

### suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. What is your acceleration?

2 m/s to the second power

### an object moving at 30 m/s takes 5 s to come to a stop. What is the object's acceleration?

-6 m/s to the second power

acceleration

### an object that is accelerating may be

slowing down, changing speed, gaining speed all these are correct

newton

### when an unbalanced force acts on an object,

the object accelerates

equal to zero

### as you push a cereal box across a tabletop, the sliding friction acting on the cereal box

acts in the direction opposite of motion

### the forces acting on a falling leaf are

gravity and air resistance

inertia

mass

### if a force of 12 N is applied to an object with a mass of 2 kg, the object will accelerate at

6 m/s to the second power

### your weight equals your

mass times the acceleration due to gravity

### the acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about

one third its weight on Earth's surface

### Newton's third law of motion describes

action and reaction forces

momentum

250 kg.m/s

joule

9.0 J

4.0 m

energy

kinetic energy

40 J

118 J

chemical

electrical

### Which of the following statements is true according to the law of conservation of energy?

energy cannot be created, energy cannot be destroyed, energy can be converted from one form to another, all are corrct

geology

### the three main layers of Eath's interior are the

crust, mante, core

mineral

### rocks are classified as

igneous, metamorphic, sedimentary

metamorphic rock

the rock cycle

### what changes are involved when mud from a lake bottom turns into sedimentary rock and then into a metamorphic rock?

compaction and cementation and then heat and pressure

plate techtonics

mid-ocean ridges

### plates slide past each other, and crust is neither created nor destroyed, at a

transform boundary

plate movements

focus

the sun

### which of the following is the most likely reason that ancient observers believed taht Earth was the center of the universe?

objects in the sky appear to circle around Earth

ellipse

comets

### what led to the discovery of three more planets than those that the ancient observers knew about?

the invention of the telescope in 1600

alan shepard

### why does Earth's moon have no atmosphere?

there are no planets to release oxygen

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