P10 Forces And Motion Flashcards

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1
Q

Equation for force

A

F=MxA
Force(N) = mass(kg) x acceleration(m/s2)

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2
Q

Equation for mass

A

M= f/a
Mass = force divided by acceleration

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3
Q

What is the thinking distance

A

The distance a car travels before the brakes are applied

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4
Q

What is the braking distance

A

The distance a car travels whilst the brakes are being applied

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5
Q

What is the stopping distance

A

The sum of the thinking distance and the braking distance

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6
Q

Equation for weight

A

W =Mxg
Weight = mass x gravity

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7
Q

Equation for momentum

A

Momentum = velocity x mass

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8
Q

What does it mean when momentum is conserved

A

Whatever the momentum is before it is the same after.

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9
Q

What is an inelastic collision

A

The objects stick together after the collision, the momentum is conserved but kinetic energy is not

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10
Q

What is a perfectly elastic collision

A

The objects seperate after the collision, momentum and kinetic energy is conserved

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11
Q

Equation for kinetic energy

A

Ek= 1/2MxV2
Kinetic energy= 1/2 mass x velocity squared

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12
Q

What happens if you increase the time to crash

A

You increase safety

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13
Q

What is Newtons 2nd law

A

Force = change in momentum/time

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14
Q

What is inertia

A

The tendency for objects to continue at the same speed in the same direction

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15
Q

What does directly proportional mean

A

Linear and go through (0,0)

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16
Q

How do you find out the spring constant once finding out the gradient

A

1/gradient

17
Q

What is Hooke’s law

A

F=Kx
Force = spring constant x extension

18
Q

Equation for spring constant

A

Spring constant= force/extension

19
Q

Equation for extension

A

Extension= force/spring constant

20
Q

Equation for energy

A

Energy = 1/2 x spring constant x extension squared

21
Q

From a force-extention graph how can you find the energy

A

The area under the graph