Science W5?

Question 1

Law of Conversation of Momentum:

Answer 1

If no net force acts on a system, then the total momentum doesn’t change

Question 2

True or False: Objects within closed systems can exert force on one another

Answer 2

True

Question 3

If a girl pushes off the boards while skating and goes backwards, which law makes her go back?

Answer 3

Newtons Third Law of motion

Question 4

What is Newtons Third Law of motion

Answer 4

every action has an equal and opposite reaction

Question 5

If you press your hand on a wall, hand exerts force on wall and wall exerts equal and opposite force against hand

Answer 5

True

Question 6

What is needed for an object to have a large momentum?

Answer 6

An object has large momentum if product of mass x velocity is large

object with larger momentum is harder to stop

Question 7

what is momentum

Answer 7

the product of an objects mass and velocity

Question 8

what’s the momentum of an object at rest?

Answer 8

zero

Question 9

formula for momentum

Answer 9

mass x velocity

kgs and m/s are measurements

Question 10

What happens if you increase speed of an object?

Answer 10

The momentum will be greater

Question 11

How is momentum conserved?

Answer 11

In a closed system, the loss of momentum of one object equals the gain in momentum of another object, conserving the momentum.

Question 12

If a train has a momentum of 10 and it hits into another train, what is the new momentum of the second train (momentum divides)

Answer 12

half of the momentum of the first train which is 5

Question 13

How does Newtons first law relate to change in motion to a zero net force

Answer 13

unless unbalanced force acts, object at rest stays at rest and an object in motion stays in motion with the same speed/direction

Question 14

Inertia

Answer 14

tendency of an object to resist a change in its motion (when your running and stop the object in hand will move)

Question 15

dummy will continue forward motion after car stops/slows

Answer 15

true

Question 16

The acceleration of an object is proportional to the force acting on it

Answer 16

true

Question 17

Mass

Answer 17

measure of the inertia of an object

mass is measure of the amount of material an object contains

Question 18

the acceleration of an object depends on mass

Answer 18

true

Question 19

Acceleration Formula

Answer 19

Net Force/Mass or A=F/M

Question 20

difference between Mass and weight

Answer 20

Mass is the measure of inertia an object has, weight is the force of gravity

Question 21

Formula for Weight

Answer 21

Mass x Acceleration due to gravity (W=MG)

9.8m/s^2

Question 22

On the moon, acceleration due to gravity is 1/6 of what it is in earth

Answer 22

true

Question 23

what’s the astronaut’s weight on moon

Answer 23

1/6 of earth

Question 24

what is true about astronaut mass and weight

Answer 24

weight is 1/6 on moon but mass is the same

Question 25

electromagnetic force is a force associated with charged particles?

Answer 25

true

Question 26

strong nuclear force is a

Answer 26

powerful force of attraction that acts only on the newtons/protons in a nucleus, holding them together

Question 27

weak nuclear force is a

Answer 27

attractive force that acts only over a short range

Question 28

gravitational force is

Answer 28

attractive force that acts between any two masses

Answer 29

s

Question 30

whenever one object exerts a force, second object exerts equal and opposite force on first object

Answer 30

Newtons Third Law of motion

Question 31

which is not a force?

Answer 31

Momentum, Friction/Gravity/Weight are forces

Question 32

you push on box and can't move it, what force opposes the push?

Answer 32

static friction

Question 33

air resistance depends on

Answer 33

the velocity of a moving object

Question 34

what force besides gravity acts on a projectile

Answer 34

air resistance

Question 35

Newtons first law of motion is also called

Answer 35

the law of inertia

Question 36

A change in what affects weight of object?

Answer 36

acc due to gravity

Question 37

What represents Newtons second law?

Answer 37

A= F/M

Question 38

for every action force there is a

Answer 38

reaction force

Question 39

momentum depends upon _

Answer 39

mass and velocity

Question 40

what force holds nucleus together

Answer 40

strong nuclear

Question 41

three forces act on a crate (both sides are 8N) describe the motion

Answer 41

Box will not move, net force is equal to zero

Question 42

Two 4 Newton forces act on an object in the same direction, what is the total net force

Answer 42

8 newtons

Question 43

Five forces act on an object, is it possible for the object to have a net force of zero

Answer 43

Yes it is, both directions could be the same amount of momentum, resulting in a net force of zero. One side has a momentum of 2, 4, 1 and the other has momentum of 3 and 4

Question 44

When an unbalanced force acts on an object it

Answer 44

accelerates/moves

Question 45

you push on a box harder and harder until it moves, was static or sliding Friction stronger of a force?

Answer 45

static