Flashcards in Topic five - forces Deck (17):

1

## what is the difference between vectors and scalar quantities

### vectors have a direction in association with them whereas scalar quantities do not

2

## what are the two types of forces

### contact and non-contact

3

## how do you work out the distance from the pivot if you are not applying the force perpendicular to it.

### you work out the perpendicular distance from the pivot i.e. continue along with the force until it is 90 degrees to the distance

4

## how do you work out the pascals

### newtons per metre squared

5

## how do you work out the pressure in a liquid

### the height of the column of liquid x the density of the liquid x the gravitational field strength

6

## how do you work out the upthrust in water

### the mass of the displaced water.

7

## what is a typical walking speed

### 1.5 m/s

8

## what is a typical running speed

### 3 m/s

9

## what is a typical cycling speed

### 6 m/s

10

## what is a typical car speed

### 25 m/s

11

## what is a typical train speed

### 55 m/s

12

## what is a typical plane speed

### 250 m/s

13

## what is newton's first law of motion

### 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 just carry on moving at the same velocity.

14

## what is newton's second law of motion

### the acceleration of an object as produced by a net force is directly proportional to the magnitude of the force and inversely proportional to the mass.

15

## what is newton's third law of motion

### when two objects interact, the forces they exert on each other are equal and opposite.

16

## what two main factors affect thinking distance

### speed and your reaction time

17