Flashcards in Forces and Motion Deck (53)

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1

## What is the equation for speed?

### speed = distance/time

2

## What is the equation for weight?

### weight = mass x gravity

3

## What is the equation for acceleration?

### acceleration = change in velocity/time

4

## What is the relationship between force, mass, and acceleration?

### force = mass x acceleration

5

## What does the gradient in a distance time graph represent?

### speed

6

## What does the gradient in a velocity time graph represent?

### acceleration

7

## What does a curving line represent on a distance time graph?

### acceleration/ deceleration

8

## What does a curving line represent on a velocity time graph?

### increasing acceleration / deceleration

9

## What does a horizontal line represent on a distance time graph?

### stopped

10

## What does a horizontal line represent on a velocity time graph?

### steady speed

11

## What IS acceleration?

### the rate of increase of velocity with time

12

## Why do objects reach terminal velocity?

### when an object has the balanced forces of air resistance and weight on it. It falls at a constant speed. The two examples are a sky diver and sycamore seeds.

13

## How do you find distance from a velocity time graph?

### area under graph

14

## What is the unit for velocity?

### m/s

15

## What is the unit for acceleration?

### m/s2

16

## What is the unit for force?

### Newtons

17

## What is the unit for momentum?

### kg m/s

18

## What is the unit for volume?

### m3

19

## What is the fancy unit for temperature?

### Kelvin (-273°C)

20

## What is the difference between a vector and a scalar quantity?

### a vector quantity has both direction and magnitude, where as a scalar quantity just has magnitude.

21

## What IS friction?

### the force which opposes motion

22

## Use ideas about molecules to explain how pressure is caused inside an object.

###
Any three of

MP1. idea of (continuous) random

movement;

MP2. collisions / impact/eq;

MP3. with (inside) walls;

MP4. idea that force is produced (by

bombarding molecules);

MP5. idea of pressure as force on an

area;

23

## What is the equation for gravitational potential energy?

### gravitational potential energy = mass x gravity x height

24

## What is the equation for refractive index?

### n = sin i/ sin r

25

## What is Newton's third law of motion?

### for every action, there is an equal and opposite reaction

26

## What does stopping distance consist of?

### thinking distance = braking distance

27

## What 2 things affect thinking distance?

###
- speed

- state of driver (eg. old age, tiredness, dugs, alcohol, inexperience?

28

## What 4 things affect breaking distance?

###
- speed

- mass of vehicle

- quality of brakes

- grip (road surface, weather, tyres)

29

## What is the equation for momentum?

### momentum = mass x velocity

30