# Forces

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- Created by: lottiebissett
- Created on: 13-05-18 21:05

What does Newtons Third Law say?

when 2 ojects interact, the forces that they exert are equal and opposite

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Whats a vector quantity?

These have a magnitude and a direction

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3 Examples of vector quantities

displacement, force, acceleration

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What is a scalar quantity?

These only have a magnitude and no direction

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3 Examples of scalar quantities

temperature, speed, distance

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What are vector quantities represented by?

arrows

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What does the length of the arrow for vectors represent?

shows the magnitude

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1 Example of a contact force

friction

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What is a contact force?

When 2 objects have to be tocuhing for a force to act

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What is a non-contact force?

When objects dont need to be touching for a force to act

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1 example of a non-contact force

gravitational force

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What is meant by the phrase interaction pair?

a pair of forces that are equal and oppoiste and act on two interacting objects

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What are 2 effects of things being closely attracted to planets/ stars?

1. It gives everything a weight. 2. Makes all things on planets surface to fall to ground

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What is mass?

amount of stuff in an object

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What is weight?

force acting on an object due to gravity

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What is weight measured in?

Newtons (N)

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What is mass measured in?

Kilograms (Kg)

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What is meant by the term centre of mass?

a point at which you assume the whole mass is concentrated

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What is the equation for weight?

weight = mass x gravitational field strength

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What are the units for gravitational field strength?

N/Kg

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What does it mean by the term resultant force?

The overall force on a point or an object

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Equation for work done?

work done = force x distance

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What does equilibrium mean?

If all the forces acting on an object combine to give a resultant force of 0, then the object is equilibrium

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What is moment?

The turning effect of a force

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What is the equation for moment?

moment = force x distance

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What does distance actually mean in the equation for moment?

The perpendicular distance to from the pivot to he line of action of the force

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What do levers do?

increase the distance from pivot at which the force is applied

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What do gears do?

transmit rotational effects

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What happens when gear teeth interlock?

turning one gear, causes another one to turn but in the opposite direction

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Why will a force given to a larger gear cause a bigger moment?

because the distance to the pivot is bigger

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Do smaller or bigger gears turn faster?

small

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What is the definition of distance?

How far an object has moved

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What quantity is distance?

scalar

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What is the definition of displacement?

Measures the distance adn direction in a straight line from an objects starting point to end point

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Why is distance a scalar quantity?

Because it doesnt involve a direction

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What is meant by speed?

how fast you are going with no regard to a direction

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What is velocity?

the speed in a given direction

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What is the equation for distance travelled?

distance travelled = speed x time

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What is the equation for speed?

speed = distance / time

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What does acceleration mean?

change in velocity in a given time

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equation for acceleration?

acceleration = change in velocity / time

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what does deceleration mean?

negative acceleration

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What does uniform acceleration also mean?

constant acceleration

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what is the equation for uniform acceleration?

v(squared) - u (squared) = 2as

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V in SUVAT =?

Final velocity

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U in SUVAT =?

Initial velocity

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a in SUVAT =?

Acceleration

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s in SUVAT =?

Distance

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t in SUVAT =?

Time

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On distance-time graphs, what does the gradient equal?

speed

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On distance-time graphs, what do flat sections mean?

something is stationary

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What does stationary mean?

something isnt moving

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On distance-time graphs, what do straight, uphill lines mean?

travelling at a constant speed

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On distance-time graphs, what do curves mean?

either acceleration or deceleration

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On velocity-time graphs, what does the gradient equal?

acceleration

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On velocity-time graphs, what do flat sections mean?

travelling at a steady speed

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On velocity-time graphs, the stepper the graph...

the bigger accelration or deceleration

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On velocity-time graphs, downhill sections mean...

deceleration

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On velocity-time graphs, what do curves mean?

changing acceleration

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## Other cards in this set

### Card 2

#### Front

Whats a vector quantity?

#### Back

These have a magnitude and a direction

### Card 3

#### Front

3 Examples of vector quantities

#### Back

### Card 4

#### Front

What is a scalar quantity?

#### Back

### Card 5

#### Front

3 Examples of scalar quantities

#### Back

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