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

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1

## what was Newtons first law

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- 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

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- 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

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- 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

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- 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

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- 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