laws of motion

Question 1

Force

Answer 1

A push or pull on an object

Question 2

Contact force

Answer 2

A pressure pull on one object by another that is touching it

Question 3

Contact forces can be weak like when you

Answer 3

press the keys on a keyboard

Question 4

Contact forces can be strong such as when

Answer 4

large sections of rock moves causing an earthquake

Question 5

Gravity

Answer 5

An attractive force that exists between all objects that have mass

Question 6

Mass

Answer 6

The amount of matter in an object often measured in kilograms (kg)

Question 7

Who developed a lot of universal gravitation

Answer 7

Sir Isaac Newton

Question 8

What is the law of universal gravitation

Answer 8

That all objects are attracted to each other by gravitational force

Question 9

What does the strength of a force depend on

Answer 9

The mass of each object in the distance between them

Question 10

When the mass of one or both objects increase

Answer 10

the gravitational force between them also increases

Question 11

The attraction between objects decreases as a

Answer 11

distance between the objects increases

Question 12

Weight

Answer 12

The gravitational force exerted on an object

Question 13

The gravitational force earth exerts on you is _______ than the force exerted by any other object

Answer 13

Greater

Question 14

The object’s weight is ________ to its mass

Answer 14

proportional

Question 15

Near Earth’s surface, the way of an object in Newton’s is about blank times its mass in kilograms

Answer 15

10

Question 16

How much change in weight is there when the distance increases greatly

Answer 16

No significant change

Question 17

An astronaut in space is still only about blank of what it is on earth

Answer 17

90%

Question 18

Friction

Answer 18

A force of a system motion of two surfaces that are touching

Question 19

Static friction

Answer 19

Prevent surfaces from sliding past each other

Question 20

Up to a limit what does a static friction do

Answer 20

The strength of static friction changes to match the applied force

Question 21

Sliding friction

Answer 21

Opposes the motion of surfaces sliding past each other

Question 22

What happens when static friction reaches its limit between surfaces

Answer 22

The box will move

Question 23

Fluid friction

Answer 23

Friction between a surface and a fluid

Question 24

Air resistance

Answer 24

Fluid friction between the surface and air

Question 25

What happens when you decrease the surface area towards the oncoming fluid

Answer 25

It decreases the air resistance against the object

Question 26

What causes friction

Answer 26

The interactions between the tiny bumps on surfaces as they rub against each other. The bumps on each surface bed and exert a force on each other making it hard for the surface to slip over each other

Question 27

What happens when a positive charge on one surface slides by negative charge on the other surface

Answer 27

An attraction occurs between the particles

Question 28

What makes up all surfaces

Answer 28

Small particles (atoms and molecules)

Question 29

What happens with less friction

Answer 29

Is easier for surfaces to slide past each other

Question 30

What happens when you rub soapy hands together in the soapy water slightly separates the surfaces of your hands

Answer 30

It causes less contact between the microscopic dips and bumps and between the electrical charges of your hands

Question 31

Net force

Answer 31

The combination of all the forces acting on an object

Question 32

What happens when two or more forces act on an object

Answer 32

The forces combine

Question 33

What happens when you combine forces in the same direction

Answer 33

The net force is the sum of the individual forces

Question 34

What happens when you combine forces in opposite directions

Answer 34

the forces will cancel, resulting in a net force of zero and no movement.

Question 35

Balanced forces

Answer 35

Forces acting on an object that combine and form a net force of zero

Question 36

Unbalanced forces

Answer 36

Forces acting on an object that combined and form a net force that is not zero

Question 37

What happens when equal forces act on an object in opposite directions

Answer 37

The net force on the object is zero

Question 38

Newton's first law of motion

Answer 38

If a net force of an object is zero the motion of the object has not changed. If something isn't pushed it won't move

Question 39

According to news first law motion what do bounds forces cause in an object's velocity

Answer 39

No change, which is true when an object is at rest or in motion

Question 40

Terminal Velocity

Answer 40

The constant velocity reached when air resistance equals the force of gravity acting on a falling object

Question 41

Newton's first law of motion only applies to what

Answer 41

Balance forces acting on an object

Question 42

What happens when unbalanced forces act on an object at rest

Answer 42

The object starts moving

Question 43

What happens when an unbalanced force is act on already moving object

Answer 43

The object speed, direction of motion, or both change

Question 44

Inertia

Answer 44

The tendency of an object to resist the change in its motion

Question 45

On Earth friction can be what

Answer 45

Reduce but not totally removed

Question 46

What has happened for an object to start moving

Answer 46

A first grader than a static friction must be applied to it

Question 47

What else happens to keep the object in motion

Answer 47

force at least as strong as friction must be applied continuously

Question 48

How do objects stop moving

Answer 48

Because friction or another force acts on them

Question 49

Circular motion

Answer 49

Any motion in which an object is moving along a curved path

Question 50

When will an object speed up

Answer 50

If acceleration points in the same direction as the velocity

Question 51

When will an objects slow down

Answer 51

if the direction of the net force on an object is opposite to the direction an object moves

Question 52

What is a way that unbalanced forces can change an object's velocity

Answer 52

to change its direction

Question 53

Another name for a change in velocity over time

Answer 53

acceleration

Question 54

unbalanced forces can make an object accelerate by

Answer 54

changing its speed, its direction, or both

Question 55

Inertia of the moving object and the centripetal force acting on the object produce what

Answer 55

the circular motion of the ball and the moon

Question 56

what does newton's second law of motion descrive

Answer 56

the relationship between an object's change in velocity over time, or acceleration, and unbalanced forces acting on the object

Question 57

centripetal force

Answer 57

In circular motion, a force that acts perpendicular to the direction emotion, towards the center of the curve

Question 58

What does an object that experiences centripetal pedal force

Answer 58

Satellite

Question 59

What path does a satellite tend to move along

Answer 59

A straight path because of inertia

Question 60

What is essential pedal force that keeps a satellite in orbit by changing its direction

Answer 60

Gravity

Question 61

noncontact force

Answer 61

A force that one object can apply to another object without touching

Question 62

The gravitational force between objects __________ as the distance between the objects ___________

Answer 62

decrease, increase (line that goes down then to the right)

Question 63

Static friction _______ from moving, sliding _________ the motion

Answer 63

prevents, slows

Question 64

same strength equals

Answer 64

balanced

Question 65

different strength equals

Answer 65

unbalanced