P2

Question 1

What is the Conservation of Momentum?

Answer 1

Momentum Before = Momentum After

Question 2

What is the Equation for Momentum?

Answer 2

Momentum = Mass X Velocity

Question 3

What is the unit for Momentum?

Answer 3

kgm/s

Question 4

What is Work Done to an Elastic Object stored as?

Answer 4

Elastic Potential Energy

Question 5

What is the Limit of Proportionality?

Answer 5

The maximum that the elastic object can take and still extend proportionally.

Question 6

What is Work Done?

Answer 6

When a force moves an object through a distance,energy is transferred and work is done.

Question 7

What is the equation for Gravitational Potential Energy?

Answer 7

GPE = Mass x Gravity x Height

Question 8

What is the Stopping Distance?

Answer 8

It is the distance covered by a Vehicle in the time between when the Driver first spotted a Hazard,and the Vehicle coming to a stop.

Question 9

What two factors affect the Stopping Distance?

Answer 9

The Braking Distance

The Thinking Distance

Question 10

What is the Thinking Distance?

Answer 10

The distance the Vehicle travels during the driver’s reaction time.

Question 11

What is the Braking Distance?

Answer 11

It is the Distance the car travels from the fine the car begins braking until it stops.

Question 12

What is the Thinking Distance affected by?

Answer 12

How fast you’re going.
How tired you are.
Drugs/Alcohol

Question 13

What is the Braking Distance affected by?

Answer 13

How fast you’re going.
The quality of the car’s Brakes.
The quality of the tyres.
How good the grip is,which depends on the surface,weather,and tyre quality.

Question 14

What is a Reaction Force?

Answer 14

When 2 objects interact,the forces they exert on each other are equal,and in opposite directions.

Question 15

In which direction does Friction work in?

Answer 15

It acts in the opposite to the movement of the object.

Question 16

What is Terminal Velocity?

Answer 16

When the frictional force is equal to the accelerating force.

Question 17

What increases as Speed increases?

Answer 17

Drag

Question 18

What does the Frictional Force of a Skydiver depend on?

Answer 18

Shape and Area

Question 19

Why don’t all objects fall to the ground at the same time?

Answer 19

Because of Air Resistance

Question 20

What is the Resultant Force?

Answer 20

The overall on a point or an object.

Question 21

What does a Resultant Force have?

Answer 21

A direction

Question 22

What are the three rules of the Resultant Force?

Answer 22

If the Resultant Force on a stationary object is 0,the object will remain stationary.

If there is no resultant force on a moving object,it’ll carry on moving at the same velocity.

If there is a non-zero resultant force,then the object will accelerate in the direction of the force.

Question 23

What is Gravitational Force?

Answer 23

The force of attraction between all masses.

Question 24

What is Mass?

Answer 24

Is the amount of stuff in an object,measures in kilograms. It will have the same value anywhere.

Question 25

What is Weight?

Answer 25

Weight is caused by the pull of gravitational force. It is measured in Newtons. Weight = Mass x Gravitational field strength

Question 26

What is Power?

Answer 26

Power is the rate of doing work,which is measured in Watts. Power = Work Done/Time Taken

Question 27

What are Regenerative Brakes?

Answer 27

They are brakes which instead of converting kinetic energy to heat energy,they make the motor go into reverse,which slows the wheels,and turns the engine into an electrical generator-which converts kinetic energy into electrical energy which is stored in the batteries as chemical energy.

Question 28

What are Cars designed to do in a Crash?

Answer 28

Convert Kinetic energy safely in a crash,by increasing the time in which the momentum changes so there is a smaller force.

Question 29

What features of a Car increase the time the momentum takes to change in a crash,decreasing the force?

Answer 29

Crumple Zones-which converts the car's kinetic energy into other forms of energy as the car body changes its shape. Seat Belts-which stretch slightly,increasing the time it takes for the Wearer to stop. Air Bags-slow you down gradually. Side Impact Bars-strong metal tubes fitted into car door panels,which help direct the kinetic energy away from the passengers and to other parts of the car.

Question 30

Cycle of a star larger than our sun:

Answer 30

``` Protostar | Main Sequence Star | Red Super Giant | Supernova | Neutron Star | Or Black Hole ```