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Physics 1 - Motion, Forces And Conservation Of Energy > Newton's Laws And Forces > Flashcards

Flashcards in Newton's Laws And Forces Deck (21)
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1

what was Newtons first law

- if the resultant force on a stationary object is zero, the object will remain stationary
- if the resultant force on a moving object is zero, it will continue moving at the same velocity

2

what is the resultant force

the sum of forces acting upon an object

3

if the resultant force on a moving and stationary object is 0, what happens

- the moving object still moves at the same velocity
- the stationary object stays that way

4

what happens if the resultant force on a stationary object is not 0

it will accelerate in the same direction of the force

5

what happens if the resultant force on a moving object is not 0

it will accelerate, decelerate or change direction

6

if a ball is tied to a string and is spun around, what force is acting upon it

centripetal force

7

what is the speed and velocity of a ball that is tied to a string ans spun around

the speed is always the same and the velocity is always changing and therefore accelerating

8

why is the ball tied to a string accelerating when spun around

because the direction is always changing

9

when a bucket of water is tied to a rope and spun around, what force acts upon the bucket

tension force

10

what is a scalar quantity

quantities that are described by a magnitude

11

what is a vector quantity

quantities that are described by a magnitude and a direction

12

what is Newtons second law

- the larger the resultant force acting on an object, the more it accelerates so force and acceleration are directly proportional
- acceleration is inversely proportional to the mass of the object
- f = ma

13

what is acceleration

the increasing change in velocity

14

when do objects accelerate

when the resultant force is not 0. if the resultant force is doubled the acceleration will double too

15

formula for calculating acceleration

a= v-u / t. (end velocity - start velocity)

16

formula for calculating force

f= ma

17

what is inertial mass

the ratio of force over acceleration, or m = f / a

18

What is newton's third law

when two forces interact, the forces they exert on eachother are equal ad opposite

19

explain why you dont move when you lean on a wall even though you are exerting a force

- when he pushes against the wall, theres a normal contact force acting back on him
- two forces are the same size
- as man applies force and pushes wall, the wall pushes back with equal force

20

explain the interactions of forces when two skaters, skater B being heaver, push against each other

- when skater a pushes skater b, she feels an equal opposite force from skater b's hand
- this is is the normal contact force
- both skaters feel the same sized force in opposite directions
- the accelerate from eachother
- skater a has a smaller mass, so will accelerate more than skater b. a = f / m

21

when can an object only be in equilibrium

when the weight of it is equal to the normal contact force