# Physics

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- Created by: paula_perez
- Created on: 27-04-16 20:38

Name some scalar quantities

Mass, speed, energy, volume, distance, temperature

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Name some vector quantities

Displacement, velocity, acceleration, momentum, force

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What is a scalar quantity?

A quantity that has only magnitude

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What is a vector quantity?

A quantity that has both a magnitude and a direction

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What is a force?

A push or pull in a particular direction

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In what ways can forces affect motion?

Start moving, move faster, move slower, stop moving, change direction, change shape

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What is thrust?

This can be any driving force, it may be a push or pull, but it could be an engine which forces an object forward.

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What is lift?

This is the force required to raise an object through a fluid

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What is air resistance?

This is a force which acts in the air, it can slow objects down when they are moving against it. Or if harnessed could be used to move an object along.

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What is friction?

This force acts on objects when they are in contact with a surface, such as the ground. It can be reduced by ensuring both surfaces are smooth.

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What is gravity?

This force affects every object on Earth. It is a force which pulls everything to the centre of the earth.

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What is upthrust?

This is an upward force which acts in water, it acts on a object against gravity, and is why certain objects float.

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Name some contact forces

Fictional force, tension force, normal force, air resistance force, applied force, spring force

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Name some non-contact forces

Gravitational force, electrical force, magnetic force

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What are forces measured in?

Newtons (N)

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What is the gravitational field strength measured in?

Newtons per kilogram (N/kg)

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What is the calculation for weight?

Weight=mass x gravitational field strength

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What is mass?

A measure of the amount of material an object is made of, it is measured in kilograms (kg)

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What is weight?

The force of gravity on an object, it is measured in newtons (N)

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How is a contact force produced?

When two objects are touching eachother

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How is a non-contact fore produced?

For this one the objects do not have to touch eachother

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What is work done?

Is energy transferred

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What is the formula for work done?

Work = force x distance

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What is work done measured in?

Joules (J)

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How do you find the change of gravitational potential energy?

Change of gravitational potential energy (J) = mass x gravitational field strength x change of height

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What does the turning effect of a force depend on?

The distance from the pivot

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What is a moment?

Moment (M) = force x perpedicular distance from pivot

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How can you increase the size of a moment?

Increase the size of the force or Increase the distance from the pivot

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What is pressure?

The force per unit area

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What is the formula for pressure?

Pressure = force / area

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What unit is pressure measured in?

Pascal (Pa)

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What factors affect pressure in a fluid?

The depth the pressure is measured at, the density of the fluid, the gravitational field strength

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What is pressure in a fluid caused by?

The particles in the fluid

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What is the formula for finding pressure in a fluid?

Pressure = density x gravity x height

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What affects atmospheric pressure?

Altitude

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What is the centre of mass?

The centre of mass of an object is that point at which its mass may be thought to be concentrated

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What is equilibrium?

A state in which opposing forces or influences are balanced

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What is the formula for speed?

Speed = distance / time

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What is the formula for acceleration?

Acceleration = velocity (1) - velocity (2) / time (1) - time (2)

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What is acceleration measured in?

metres per second squared (m/s2)

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What is acceleration?

The rate of change in speed (or velocity), measured in m/s2. Acceleration=change of velocity/time taken

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What is deceleration?

Slowing down or negative acceleration

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What is displacement?

Quantity describing the distance from the start of the journey to the end in a straight line with a described direction

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What is magnitude?

The magnitude tells us the size of the vector

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What is momentum?

A quantity relating to a moving object that is calculated by multiplying its mass by its velocity

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What does stationary mean?

Not moving

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What is velocity?

The speed of an object in a particular direction

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What is terminal velocity?

the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

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What factors affect your reaction time?

Intoxication, tired/illness, distraction, emotion

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What factors affect your braking distance?

Road surface (baldness), tyre condition (friction), weather, speed, mass

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What is the thinking distance?

the distance travelled where the driver is THINKING about stopping

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What is the braking distance?

the distance travelled AFTER the brake has been applied.

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If two forces act on an object along the same line, the resultant force is:

1. their sum if the forces act in the same direction. 2. their difference if the forces act in opposite directions

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What is the limit of proportionality?

The limit for Hooke's law applied to the extension of a stretched spring

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What is Hooke's Law written as an equation?

Force applied (N) = spring constant (N/m) x extension (m)

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What is the spring constant?

The spring constant is different for different objects and materials. It is found by carrying out an experiment. For example, the unloaded length of a spring is measured. Different numbers of slotted masses are added to the spring and its new length

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What is the formula for momentum?

Momentum (kg m/s) = mass x velocity (m/s)

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Is momentum conserved?

Yes

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What is elastic deformation?

A change in shape of a material at low stress that is recoverable after the stress is removed.

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What is a linear relation?

A relation between two variables which creates a straight line when graphed

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What is different about non-linear relations?

They do not have a constant slope

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## Other cards in this set

### Card 2

#### Front

Name some vector quantities

#### Back

Displacement, velocity, acceleration, momentum, force

### Card 3

#### Front

What is a scalar quantity?

#### Back

### Card 4

#### Front

What is a vector quantity?

#### Back

### Card 5

#### Front

What is a force?

#### Back

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