Forces

Question 1

force

Answer 1

a push or pull that is a vector quantity

Question 2

a force is described by its __________ and by the __________ in which it acts

Answer 2

magnitude; direction

Question 3

What is an arrow used for to represent a part of a force?

Answer 3

its direction and strength

Question 4

Newton

Answer 4

the SI unit for magnitude or strength of a force

Question 5

When an object is subject to two or more forces at once, what is the resulting combination?

Answer 5

it effects all the forces

Question 6

net force

Answer 6

the combination of all forces acting on an object that determines whether an object moves and in what direction it will move

Question 7

when two or more forces act in the same direction, the net force is found by adding what?

Answer 7

the strength of the individual forces

Question 8

adding a force acting in one direction to a force in the opposite direction is the same as what?

Answer 8

adding a positive to a negtave

Question 9

the opposing force are equal in strength which means…

Answer 9

there’s no net force

Question 10

unbalanced forces

Answer 10

the cause of the velocity of an object to change (speed up, slow down, or change direction)

Question 11

unbalanced forces acting on an object result in a net force and causes a change in the objects…

Answer 11

velocity

Question 12

balanced forces

Answer 12

when equal forces act on one object in opposite direction

Question 13

balanced forces acting on an object do not change the objects…

Answer 13

velocity

Question 14

friction

Answer 14

a force that acts in a direction opposite to the motion and is also the force that two surfaces exert on each other when they rub against each other

Question 15

with friction or another ubnbalanced force, what will a moving object not do?

Answer 15

it will not stop until it strikes another object

Question 16

the strength of the force of friction depends on what types of surfaces are involved?

Answer 16

how hard they’re able to be pushed together

Question 17

friction increases if…

Answer 17

surfaces push hard against each other

Question 18

Why do smooth surface produce less friction than rough surfaces?

Answer 18

when the irregularities of one surface comes into contact with those of another surface, friction occurs

Question 19

static friction

Answer 19

the friction that acts on objects that are not moving

Question 20

you must use extra force to start the motion of…

Answer 20

stationary objects

Question 21

sliding friction

Answer 21

a balanced force when two solid surfaces slide over each other

Question 22

when an object is pulled at a constant velocity across a level surface, the puling force equals…

Answer 22

the sliding friction

Question 23

rolling friction

Answer 23

when an object rolls across a surface

Question 24

fluid friction

Answer 24

when a solid object moves through a fluid (water, oil, air, and materials that flow easily)

Question 25

gravity

Answer 25

a force that pulls objects toward each othern

Question 26

universal law of gravitation

Answer 26

a law made by Newton that states that the force of gravity acts between all objects in the universe without exception attract each other

Question 27

you don't notice the attraction among objects because...

Answer 27

these forces are small compared to the forces on Earth's attraction

Question 28

the force of gravity between objects increases and decreases by what?

Answer 28

increases-greater mass decreases-greater distance

Question 29

mass

Answer 29

the measure of the amount of matter in an object

Question 30

what is the SI unit for kilograms?

Answer 30

mass

Question 31

the gravitational force of mass depends on the distance between...

Answer 31

objects (the lesser the gravitational force, the farther apart they are)

Question 32

weight

Answer 32

the gravitational force exerted on a person or object at the surface of a planet

Question 33

what is the equation for weight?

Answer 33

weight = mass*acceleration due to gravity

Question 34

unlike mass, weight varies with the strength of what?

Answer 34

the gravitational force

Question 35

free fall

Answer 35

when the only force acting on a n object is gravity that is accelearting

Question 36

in free fall, the force of gravity alone causes an object to what I'd the downward directin?

Answer 36

accelerate

Question 37

air resistance

Answer 37

a type of fluid friction that acts on objects falling through air that is an upward force exerted on falling objects

Question 38

projectile

Answer 38

an object that is thrown

Question 39

compression

Answer 39

an elastic force that squeezes or pushes matter togethere

Question 40

tension

Answer 40

an elastic force that stretches or pulls mattertons

Question 41

Newtons first law of motion (the law of inertia)

Answer 41

states that an object will remain at rest or moving at a constant velocity unless it is acted by an unbalanced force

Question 42

inertia

Answer 42

the tendency of an object to resist a change in motion

Question 43

newtons second law of motion

Answer 43

states that acceleration depends on the net force acting of the object and on the objects amss

Question 44

what two equation mean the same when it comes to acceleration or net force?

Answer 44

acceleration=net force/mass net force= mass*acceleration

Question 45

newtons third law of motion

Answer 45

states that if one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction; for every action, there is an equal opposite reaction

Question 46

what is the quantity of motion

Answer 46

a Newton that is part of all moving objects

Question 47

momentum

Answer 47

a characteristic of a moving object that depends on both the mass and velocity of the ovjectou

Question 48

what is the equation for momentum

Answer 48

momentum = mass*velocity

Question 49

the law of conservation of momentum

Answer 49

int eh absence of outside forces the total momentum of objects that interact does not change

Question 50

the total momentum of any group of objects remain the same or...

Answer 50

is conserved unless outside force act on the objects

Question 51

thrust

Answer 51

an upward force that is greater than the downward pull of gravity

Question 52

satellite

Answer 52

any object that orbits another object in space

Question 53

an object traveling in a circle is constantly changing direction so it is...

Answer 53

acceleratingi

Question 54

f an object is accelerating it means...

Answer 54

an unbalanced force must be acting on it

Question 55

tripetal force

Answer 55

any force that causes an object to omv ein a circular path