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Flashcards in Physics 5 Deck (55)
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0

What is speed ?

How fast something is going

1

What is velocity ?

How fast you are going with a direction

2

On a distance time graph what is the gradient ?

Speed

3

What does a flat section mean on a distance time graph ?

Stationary

4

If a distance-time graph goes downwards, what is happening ?

Going back to starting point

5

What do curves represent on a distance-time graph ?

Acceleration or deceleration

6

How do you work out the speed with a distance-time graph ?

Vertical line
______________

Horizontal line

7

What is acceleration ?

How quickly the velocity is changing , it can be a change in speed, direction or both

8

Acceleration = ???

Change in velocity
_________________

Time taken

9

On a velocity time graph, what does a curve or diagonal line mean ?

Increasing / decreasing acceleration

10

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

A steady speed

11

How can you find the acceleration on a velocity-time graph ?

Work out the gradient by dividing the vertical change by horizontal change

12

What is gravitational force ?

The force of attraction between all masses

13

What are two important effects of gravitational force ?

• It makes all things accelerate towards the ground
• It gives everything a weight

14

Are mass and weight the same thing ?

No

15

What is mass ?

The amount of 'stuff' in an object, this will be the same even when gravitational force changes

16

What is weight ?

It is determined by the strength of the gravitational force

17

What are weight and mass measured in ?

Weight - newtons
Mass - Kg

18

What formula relates mass and weight ?

Weight = mass x gravitational field strength

19

What is resultant force ?

The overall force on a point or object

20

What does resultant force determine ?

motion, whether acceleration deceleration or stay at a steady speed

21

What happens If the resultant force is zero, when the object is stationary ?

It will remain stationary

22

What happens if there is no resultant force on a moving object ?

It will continue to move at that velocity

23

What is the equation for a non-zero resultant force ?

F = m x a

Resultant force=massxacceleration

24

When two objects interact two forces are exerted, what are they ?

Equal and opposite

25

If the forces are always equal, how do things move ?

Even though the same force is exerted from each object, the forces are acting on different objects. One of the objects could be lighter than the other an therefore move

26

What does friction do ?

Slow things down

27

Why do objects come to a halt gradually when no force is propelling it ?

Because friction always acts in the opposite direction to movement

28

What is drag ?

Resistance from liquids or gases

29

What makes things less affected by drag ?

Being more streamlined