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Physics > P2 > Flashcards

P2 Flashcards

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1
Q

What is the Conservation of Momentum?

A

Momentum Before = Momentum After

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2
Q

What is the Equation for Momentum?

A

Momentum = Mass X Velocity

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3
Q

What is the unit for Momentum?

A

kgm/s

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4
Q

What is Work Done to an Elastic Object stored as?

A

Elastic Potential Energy

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5
Q

What is the Limit of Proportionality?

A

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

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6
Q

What is Work Done?

A

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

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7
Q

What is the equation for Gravitational Potential Energy?

A

GPE = Mass x Gravity x Height

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8
Q

What is the Stopping Distance?

A

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.

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9
Q

What two factors affect the Stopping Distance?

A

The Braking Distance

The Thinking Distance

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10
Q

What is the Thinking Distance?

A

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

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11
Q

What is the Braking Distance?

A

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

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12
Q

What is the Thinking Distance affected by?

A

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

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13
Q

What is the Braking Distance affected by?

A

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.

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14
Q

What is a Reaction Force?

A

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

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15
Q

In which direction does Friction work in?

A

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

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16
Q

What is Terminal Velocity?

A

When the frictional force is equal to the accelerating force.

17
Q

What increases as Speed increases?

A

Drag

18
Q

What does the Frictional Force of a Skydiver depend on?

A

Shape and Area

19
Q

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

A

Because of Air Resistance

20
Q

What is the Resultant Force?

A

The overall on a point or an object.

21
Q

What does a Resultant Force have?

A

A direction

22
Q

What are the three rules of the Resultant Force?

A

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.

23
Q

What is Gravitational Force?

A

The force of attraction between all masses.

24
Q

What is Mass?

A

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

25
Q

What is Weight?

A

Weight is caused by the pull of gravitational force. It is measured in Newtons.

Weight = Mass x Gravitational field strength

26
Q

What is Power?

A

Power is the rate of doing work,which is measured in Watts.

Power = Work Done/Time Taken

27
Q

What are Regenerative Brakes?

A

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.

28
Q

What are Cars designed to do in a Crash?

A

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

29
Q

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

A

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.

30
Q

Cycle of a star larger than our sun:

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

Physics (3 decks)

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