BJU Physical Science Ch. 5 Review by Elsa & Nicole

Question 1

Tendency of motion to resist a change in motion until acted on by an external force is known as

Accepted Answer

inertia

Question 2

Electromagnetic forces weakly attract nuclear particles.

Accepted Answer

False

Question 3

A sled sliding down a hill experiences _______ friction.

Accepted Answer

kinetic

Question 4

Which of the following is not a force?

Accepted Answer

acceleration

Question 5

Why are hot-air balloons floating at a constant altitude not in free fall?

Accepted Answer

forces on balloons are balanced

Question 6

An external force is exerted from __________ a system's boundaries.

Accepted Answer

outide

Question 7

The magnitude of a force is a scalar quantity.

Accepted Answer

True

Question 8

Which of the following has the greatest linear momentum?

Accepted Answer

a .5 g piece of space dust near speed of light, 3.00×108 m/s

Question 9

True free fall is not achievable in the earth's atmosphere.

Accepted Answer

True

Question 10

A sea turtle swimming against a current experiences ______ friction.

Accepted Answer

fluid

Question 11

Contact forces cause all observed changes in motion.

Accepted Answer

False

Question 12

Sled sliding downhill experiences less friction than the same sled stopped at bottom of hill.

Accepted Answer

True

Question 13

A rotating bicycle tire experiences ________ friction.

Accepted Answer

rolling

Question 14

Galileo developed equations governing how forces act.

Accepted Answer

False

Question 15

Which is the correct unit for the weight proportionality constant?

Accepted Answer

N/kg

Question 16

The SI unit for force is the _______.

Accepted Answer

Newton

Question 17

Air resistance increases with increasing

Accepted Answer

surface area

Question 18

In true free fall, a flat sheet of paper would still fall somewhat slower than a crumpled sheet

Accepted Answer

False

Question 19

Newton´s third law applies to all objects regardless to their condition of motion.

Accepted Answer

True

Question 20

Angular momentum is exhibited in rotating systems.

Accepted Answer

True

Question 21

At a distance between Earth and moon, gravitational pull is equal, satellite would be closer to

Accepted Answer

the moon because the Earth has a stronger gravitational pull

Question 22

Branch of physics studies phenomena under extreme conditions, like objects near speed of light?

Accepted Answer

modern physics

Question 23

Gravitational force between sun and earth is dependent on square of distance between surfaces

Accepted Answer

False

Question 24

A microscopic organism like a protozoan can exert a gravitational force.

Accepted Answer

True

Question 25

Newton´s first law describes motion when no net forces are exerted.

Accepted Answer

True

Question 26

Nearly Eighteen hundred years later, __________ connected motion with the influence of forces.

Accepted Answer

Galileo

Question 27

What is the unit of inertia?

Accepted Answer

inertia has no unit

Question 28

Forces are vectors because they cause objects to accelerate in proportion to their magnitude.

Accepted Answer

False

Question 29

Modern physics concerns all of the following except

Accepted Answer

movement of the planets

Question 30

In the system of the nucleus of an atom, the weak nuclear force is an external force.

Accepted Answer

False

Question 31

Gravitational force is a field force.

Accepted Answer

True

Question 32

Field forces grow stronger with distance, but contact forces don't change with distance.

Accepted Answer

False

Question 33

Law of universal gravitation says that gravitational force varies with inverse mass of object2

Accepted Answer

False

Question 34

Whose experiment enabled scientists after him to calculate gravitational force between masses.

Accepted Answer

Henry Cavendish

Question 35

Momentum is conserved for every type of collision.

Accepted Answer

True

Question 36

Balanced forces cause the object, if it is in motion, to maintain its motion.

Accepted Answer

True

Question 37

Where can true free fall occur?

Accepted Answer

only in a vacuum

Question 38

According to Newton's 1st law, only external forces acting on an object can cause it accelerate

Accepted Answer

True

Question 39

An object falling through a fluid experiences no friction.

Accepted Answer

False

Question 40

Which of the following are not directly proportional?

Accepted Answer

distance and gravitational attraction

Question 41

Which of the following is the result of a contact force?

Accepted Answer

a hammer drives a nail into a piece of wood

Question 42

In which case are all the forces acting on a system balanced?

Accepted Answer

meteorite falls through atmosphere reaches terminal velocity

Question 43

Who was the first person to write about forces?

Accepted Answer

Archimedes

Question 44

Which object has the most inertia?

Accepted Answer

the planet Jupiter

Question 45

A car stopped on a hill experiences________ friction.

Accepted Answer

static

Question 46

Which of the following is the result of a field force?

Accepted Answer

when you jump into the air, you land on the ground

Question 47

The first person to write about forces was

Accepted Answer

Archimedes

Question 48

Air resistance is usually so small it can be ignored.

Accepted Answer

False

Question 49

The scientist who used his ideas to formulate laws was

Accepted Answer

Newton

Question 50

Even an object quite distant from the sun cannot be free from the sunś gravitational pull.

Accepted Answer

True

Question 51

Galileo disproved Aristotle's theory of gravity by a thought experiment dealing with

Accepted Answer

dropped weights

Question 52

Which of the following does not experience angular momentum?

Accepted Answer

a jet taking off from an aircraft carrier

Question 53

Newton calculated the universal gravitation constant by using the newly invented spring scale.

Accepted Answer

False

Question 54

Static and kinetic friction are directly proportional to the normal force.

Accepted Answer

True

Question 55

Friction acts only on objects in motion.

Accepted Answer

False

Question 56

Which of the following is not an action-reaction pair?

Accepted Answer

the thrust of a rocket and its upward acceleration

Question 57

A wrecking ball strikes a brick wall. What would increase the force of the ball?

Accepted Answer

increase the mass of the wrecking ball

Question 58

If the mass of a system is constant, acceleration changes when the net force exerted changes

Accepted Answer

True

Question 59

Which situation does not involve friction?

Accepted Answer

an object free of gravitational pull

Question 60

Newton developed equations describing why celestial bodies move the way they do.

Accepted Answer

True

BJU Physical Science Ch. 5 Review by Elsa & Nicole

Questions 60

BJU Physical Science Ch. 5 Review by Elsa & Nicole

Questions 60