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Physics > Forces > Flashcards

Forces Flashcards

0
Q

What is the relationship between unbalanced force and acceleration

A

The bigger the unbalanced force actin on an object the bigger the acceleration

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1
Q

What does an unbalanced force act on

A

An object along the line in which the object is moving

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2
Q

What is the relationship between acceleration and mass

A

If the same force is applied to objects of different mass the larger object will have less acceleration

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3
Q

What is the equation to find acceleration

A

Acceleration = force

Mass

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4
Q

How would you find the stopping distance

A

Thinking distance +braking distance

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5
Q

What is the thinking distance

A

Time taken before the brakes are applied

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6
Q

What can lengthen thinking distance

A

Tiredness
Drugs
Poor visibility

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7
Q

What does distance travelled while thinking depend on

A

Speed of the vehicle

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8
Q

What is the braking distance

A

The distance travelled by the vehicle after the brakes are applied

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9
Q

What can effect the braking distance

A

Brake tyre condition
Condition of road surface
Mass of car

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10
Q

What happens to objects falling through liquids and gases

A

They experience a drag force that increases with their speed

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11
Q

How is terminal velocity reached

A

When the drag force on an object balances the weight

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12
Q

What can effect the drag force

A

The shape

Objects must be streamlined to reduce drag

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13
Q

What is resultant force

A

If there is an unbalanced force the the object will accelerate in that direction

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14
Q

What is a balanced force

A

If the forces are balanced then the object will not move

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15
Q

What is Newton’s second law

A

Force = mass x area

16
Q

What is acceleration

A

It is how quickly the velocity is changing

17
Q

What is the equation for average speed

A

Average speed = total distance

Total time

18
Q

What is the equation for moments

A

Moment = force x perpendicular distance

19
Q

What is the principle of moments

A

If an object is balanced then

Total anticlockwise moment = clockwise moment

20
Q

If moments are not equal

A

I the total anticlockwise moments do not equal the total clockwise moments there will be no resultant moment

21
Q

What is the centre of mass

A

The point where the weight of the body acts

22
Q

What can you use to find e centre of gravity

A 
A plumb line
Wait till it stops moving
Draw a line along it
Do again but from a different pivot
Where the two cross
23
Q

What is the equation for weight

A

Weight = mass x gravity

24
Q

What is mass measured in

A

Kilograms

25
Q

What is weight measured in

A

Newtons

26
Q

What is velocity measured in

A

M/a

27
Q

What is friction measured in

A

Newtons

28
Q

Where does weight act from

A

the centre of gravity of an object

29
Q

How the locate the centre of gravity from a lamina object

A

Hang object from a point
Make a vertical line
Hang object from a second point
Centre of gravity is where the lines cross

30
Q

Equation for Hooke’s law

A

Force= extension x spring constant

31
Q

What is Hooke’s law

A

The extension of an elastic object is directly proportional to the force applied to it

32
Q

When is the equation for Hooke’s law not applicable

A

This equation works as long as the elastic limit (the limit of proportionality) is not exceeded. If a spring is stretched too much, for example, it will not return to its original length when the load is removed.

33
Q

Elastic potential energy

A

An elastic object such as a spring stores elastic potential energy when stretched or squashed. The extension of an elastic object is directly proportional to the force applied

Physics (11 decks)

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