Physics (Chapter 4-6) Forces (ii)

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1

What factors affect the braking force needed to stop a car?

-Speed of the vehicle
-Mass of the vehicle

2

Thinking distance

The distance travelled by the vehicle in the time it takes for the driver to react

3

Braking distance

The distance travelled by the car when the brakes are applied

4

What factors affect stopping distances?

-Tiredness,alcohol and drugs
-Speed of the vehicle
-Weather conditions
-Condition of the vehicle

5

Weight

The force of gravity on it

6

Mass

The quantity of matter

7

Terminal velocity

When the weight of an object is equal to the amount of friction on the object

8

When would you consider an object elastic?

When it returns to its original shape when the forces acting upon it are removed

9

What is Hooke's Law?

The extension of the spring is directly proportional to force applied as long as its elastic limit is not reached

10

When is work considered done?

When a force makes an object move

11

Name some ways to increase the moment of force

-Increase the force applied
-Increase the distance between the force and the pivot

12

Power

The rate of energy in which it is transfered

13

Centre of mass

Where the mass of an object is concentrated

14

How do you increase the stability of an object

-Increase surface area
-Lower centre of mass

15

Centripetal acceleration

The acceleration of an object moving round the circle towards the centre of the circle

16

Centripetal force

The resultant force that acts towards the centre of the cirlce

17

What are the factors that affect centripetal force

-The mass of the object
-The speed (faster, more)
-The radius of the circle (less, more)

18

How do hydraulics distribute pressure equally?

Due to the properties of a liquid, when force is exerted in one part, is it also transmitted to the other parts of the liquid, allowing for equal distribution

19

How do hydraulics amplify pressure?

A smaller piston applies force to a liquid which applies pressure to a wider piston and since the area of the piston is larger, more force is generated, making it a force mutliplier