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Gcse Physics > P10 > Flashcards

P10 Flashcards

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1
Q

What does the greater the resultant force on an object result in?

A

A greater acceleration of an object

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2
Q

What does the greater the mass of an object result in?

A

A smaller acceleration for a given force

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3
Q

What is the equation for resultant force(F)

A

mass(m) X acceleration(a)

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4
Q

what is the intertia of an object?

A

Its tendency to stay at rest or in uniform motion

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5
Q

What is the equation for weight(W)

A

mass(m) X gravitational field strength(g)

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6
Q

What is the weight of an object?

A

The force acting on the object due to gravity

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7
Q

What does the object acting on only by gravity do?

A

accelerated at 10m/s2

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8
Q

What is the terminal velocity of an object?

A

The velocity it eventually reaches when it is falling

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9
Q

What is the resultant force of an object when moving at terminal velocity?

A

0

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10
Q

What do friction and air resistance do to the force of a vehicle?

A

Oppose/push against it

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11
Q

What does the stopping distance of a vehicle depend on?

A

The thinking distance and braking distance

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12
Q

what gives the braking force of a vehicle?

A

Force= mass X acceleration

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13
Q

What is momentum of a moving object?

A

Momentum of a moving object(p)= mass(m) X velocity(v)

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14
Q

What is the unit for momentum?

A

kg m/s( kilograms metres per second)

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15
Q

what is conservation of momentum?

A

Yeh total momentum before an event is the same as the total momentum after the event.

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16
Q

What can a closed system also be called?

A

Conservation of momentum

17
Q

What does momentum have?

A

Size and direction?

18
Q

What is momentum defined as?

A

mass X velocity

19
Q

What is 2 objects total momentum if they move with different speeds and unequal masses?

A

0

20
Q

What does the force of the impact depend on when 2 cars collide?

A

Mass, change of velocity and length of impact.

21
Q

What happens when the impact time of a crash increases?

A

the impact force is reduced

22
Q

Name 2 things that happen when 2 vehicles collide

A

The exert equal and opposite forces on eachother
their total momentum is unchanged

23
Q

what is the impact force equation?

A

Change of momentum divided by impact time

24
Q

How do cycle helmets and cushioned surfaces reduced impact forces?

A

by increasing impact time

25
Q

How do seat belts and air bags become a safety feature?

A

by increasing impact time

26
Q

How do side impact bars and crumple zones become a safety feature?

A

they give way in an impact and therefor increase the impact time

27
Q

what can be used to find the speed of a car before an impact?

A

conservation of momentum

28
Q

What is an object called if it returns to its original shape after removing the force deforming it?

A

Elastic

29
Q

What is extension?

A

The difference between the length of the object and its original length

30
Q

What is the extension of a spring and the force applied to it

A

directly proportional

31
Q

What happens beyond the limit of proportionality?

A

the extension of a spring is no longer proportional to the applied force

32
Q

What is the inertia of an object?

A

Its tendency to stay at rest or in uniform motion

Gcse Physics (11 decks)

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