Chapter 12 Test

Question 1

What is freefall

Answer 1

An object accelerating downwards without outside force pushing upward, second law unbalanced

Question 2

What is terminal velocity

Answer 2

The speed at which an object no longer accelerates, first law balanced forces

Question 3

What is projectile, and what is its motion

Answer 3

Any object thrown in the air, always a curved path

Question 4

What is Newton’s first law

Answer 4

Object at rest remains and rest and an object in motion remains in motion until acted on by an unbalanced force

Question 5

Newtons first law describes motion as

Answer 5

Balanced forces acting on an object

Question 6

What is newtons second law

Answer 6

And unbalanced force on an object that causes it to accelerate in the direction of that force

Question 7

Newtons first law is also known as

Answer 7

Inertia

Question 8

What is newtons third law

Answer 8

For every action by a force there is always an equal and opposite reaction by another force

Question 9

What is force

Answer 9

A push or pull that stops starts or changes direction of an object in motion

Question 10

What is friction

Answer 10

A force that opposes the motion of an object

Question 11

What is sliding friction,example

Answer 11

Went to solid forces slide over each other, skiing

Question 12

What is rolling friction, example

Answer 12

When an object rolls over a surface, skateboarding

Question 13

What is fluid friction, example

Answer 13

When an object moves through a fluid liquid or a gas, skydiving or swimming

Question 14

What is static friction, example

Answer 14

A force that acts against objects that are not moving. Strong friction., Pushing a desk or walking

Question 15

What is momentum

Answer 15

Mass in motion, moving body that equals the product of its mass multiplied by its velocity

Question 16

What is the law of conservation of momentum

Answer 16

Total momentum remains the same. If one object loses momentum another object is gaining momentum

Question 17

How is the 90 kg defensive back able to knock over a 120 kg fullback

Answer 17

The defensive back has a greater velocity which gives them more momentum

Question 18

Why is a follow-through important and tennis and baseball

Answer 18

Longer in contact, more momentum is transferred to the ball

Question 19

What is gravity

Answer 19

The attractive force between all objects in the universe

Question 20

What are three things force can you do to an object

Answer 20

Stop start or change direction

Question 21

What are three factors that affect the force of sliding friction

Answer 21

Surface area, texture, Mass.

Question 22

What are three examples of things that are used to increase friction to help us

Answer 22

Wheels, shoes, sails on boats

Question 23

What are balanced forces give some examples

Answer 23

Terminal velocity, constant velocity

Question 24

What effect do balanced forces have on objects motion

Answer 24

None, they don’t change the motion

Question 25

Which law deals with conservation

Answer 25

Third law, balanced

Question 26

Car a and Car b are both traveling at 100 km per hour and collide had on. Car b is pushed back 50 km why?

Answer 26

Car a has to be twice as heavy

Question 27

What do we call the change in momentum?

Answer 27

impulse

Question 28

How is force related to time

Answer 28

More time equals less force and vice versa

Question 29

What are unbalanced forces

Answer 29

Second law, forces that do not add up to zero, changes objects motion

Question 30

What effect does an unbalanced force have on the speed and direction of an object

Answer 30

Changes speed or direction

Question 31

What is inertia

Answer 31

The resistance of an object to change motion, first law

Question 32

If you jumped up in the air neglecting air resistance in the back of a Ford pick up truck going 100 mph, where would you land? why?

Answer 32

In the same place you jumped because your body is still going 100 mph in the air

Question 33

Which two factors affect the acceleration of an object

Answer 33

Force and mass

Question 34

What does newtons third law say about forces

Answer 34

They always act in pairs

Question 35

Give three examples of a newtons third law

Answer 35

Walking, leaning on the wall, shooting a rifle

Question 36

What is terminal velocity

Answer 36

When acceleration no longer increases, constant velocity, FF equals FG

Question 37

What causes the curved path of a projectile

Answer 37

Gravity

Question 38

What is weight

Answer 38

Measure of the force of gravity on an object to

Question 39

Would your weight be greater on earth, the moon, or Saturn

Answer 39

Saturn

Question 40

What are your way to be greater in Tempe or in Flagstaff? Why?

Answer 40

Tempe, closer to center of Earth

Question 41

Would your mass be greater here, or on the moon

Answer 41

Here

Question 42

What is a synonym for air resistance

Answer 42

Drag force

Question 43

Projectile motion is the product of gravity and what

Answer 43

Inertia