# P2: Forces and Motion

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- Created by: ja7sa096
- Created on: 20-04-16 21:35

What is a force?

Any influence that causes an object to undergo a specific change

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What are the units ofr force?

Newtons (N)

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Whenever to objects push or pull on each other...

They exert equal and opposite forces on one another

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What is resultant force?

The sum of the individual forces.

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Why does force have to have a direction?

Because it is a vector

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What is zero resulatant force?

When the resultant force on an object is zero because: it remains stationary or continues to move at the same speed in the same direction

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What is non-zero resulatnt force?

When the resultant force on an object is not zero

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If an object is acted on by two unequal forces in opposite directions, the resultant force is...

Equal to the difference between the two forces, in the direction of the larger force

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What is a balanced force?

Where the forces are of equal size in opposite directions, resultant force is 0, objects are stationary/constant speed

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What is an unbalanced force?

Where the forces are of unequal size in opposite directions, resultant force>0, acceleration

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What types of forces are there?

Push, pull, upthrust, weight, friction, air/water resistance (drag), tension, reaction, lift and force from the engine (thrust)

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Resultant force is proportional to...

Acceleration

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Mass is inversely proportional to...

Acceleration

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How do we calculate force?

Mass (kg) * Acceleration (m/s squared)

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How do we calculate mass?

Force/acceleration

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How do we calculate acceleration?

Force/mass

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What is mass?

The amount of matter (particles) in an object

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What is mass measured in?

Kilograms

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What is the gravitational field strength on Earth?

9.8 (10)

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How do we calculate weight (N)?

Mass (kg) * gravitational field strength (m/s squared)

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What is the gravitational field strength o the moon?

1.6

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In a vaccuum, everything will fall at the ............, irrospective of the mass

Same rate

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Describe the process of a parachutist falling through the sky.

Weight makes her accelerate, as she accelerates so will air resistance, weight and air resistance balance out (constant speed/terminal velocity), opens parachute and increases air resistance, decelerates, air resistance and weight balance out again

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Force is proportional to...

Extension

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What is Hooke's Law?

The force applied to a material is directly proportional to the extension as long as it remains within the limit of proportionality

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What is the limit of proportionality?

The point at which the material will not return back to its original state

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How do we calculate Hooke's Law?

Force (N) = Spring constant (N/m) * Extension (m)

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What axis does extension go on?

X axis

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What axis does force go on?

Y axis

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What is the gradient of a force extension graph?

Spring constant

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What does friction do?

Slow things down

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Reaction forces are always...

Equal and opposite

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Drag increases as the .... increases

Speed

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What is terminal velocity?

When the force is equal to the resistance, resultant force is 0, moving at constant speed

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What do objects have to fall through to reach terminal velocity?

Fluids

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What do frictional forces increase with?

Speed

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Explain why the car reaches top speed, even though the thrust force remains constant.

As speed increases so does drag, thrust=drag and they balance out, resultant force=0

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## Other cards in this set

### Card 2

#### Front

What are the units ofr force?

#### Back

Newtons (N)

### Card 3

#### Front

Whenever to objects push or pull on each other...

#### Back

### Card 4

#### Front

What is resultant force?

#### Back

### Card 5

#### Front

Why does force have to have a direction?

#### Back

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