Flashcards in Topic 5 Forces Deck (25):

1

## Vectors quantities

### Have magnitude and direction. Eg force, velocity, displacement, acceleration and momentum

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## Scalar quantities

### Only have magnitude and no direction. Eg speed, distance, mass, temperature and time

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## Contact force

### Two objects have to touch for a force to act. Eg friction, air resistance, tension of ropes, normal contact force

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## Non-contact force

### When the objects don’t need to be touching to act. Eg magnetic force, gravitational force and electrostatic force

5

## Newton’s third law

### When two objects interact the force exerted is equal and opposite on the two objects

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## Gravitational force

### The force of attraction between masses. It makes all things fall to the ground. And gives everything weight

7

## Mass

### The amount of stuff in an object. Not a force. Measured in kilograms

8

## Weight

### The force acting on an object due to gravity. Weight is higher for objects that have higher masses. It is a force that is measured in Newton’s

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## The relationship of mass and weight

### They are directly proportional

10

## Free body diagrams

### It describes the forces acting on an object the sizes of the arrows show the relative magnitude of the forces and the directions they are going

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## Resultant force

### The overall force on a point or object. So the result of two forces pushing against each other

12

## Word done to an object

### When a force moves an object through a distance energy is transferred and work is done on the object

13

## Scale drawing

### They find resultant forces.

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## Equilibrium

### When forces are balanced

15

## Stretching, compressing and bending

### When more than one force acts on an object.

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## Elastically deformed

### When a force is applied to something and it returns to its original shape and length

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## Inelastically deformed

### When a force is exerted on an object causing it stay in a certain position and length

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## What is the relationship between extension to force

### They are directly proportional

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## What happens if you continue to extend the spring

### Eventually extension will increase but force will not and it has reached maximum force

20

## Moment

### The turning effect of a force. The longer the distance from the pivot and the more energy exerted means a higher moment

21

## Levers

### Make it easier to do work. Since moment = force x distance if the moment stays the same and the distance increases the force must decrease

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## Gears

### Gears interlock and turn in the opposite direction. Transmit the rotational effect of the force. Different sized gears change the moment so larger gear will cause a bigger moment. Larger gears will turn slower

23

## Pressure

### The force per unit area. The particles move around exert a force on the object

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## Pressure in liquids

### Depends on depth and density. The more dense a liquid is the more particles it has so will collide and have a higher pressure. As the depth increases the number of particles above increases so the pressure increases

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