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Revision 📚 > Physics Forces and Motion > Flashcards

Physics Forces and Motion Flashcards

1
Q

Def Scalar Quantities

A

Have a size but no direction

Eg mass, speed, distance, energy, temperature

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2
Q

Def Vector Quantities

A

Have a size and a direction

Eg force, weight, velocity, displacement, acceleration, momentum

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3
Q

Speed equation

A

Speed=distance/time

S=d/t

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4
Q

Distance/time graphs meanings

A

Slanted straight line - constant speed
Upward curve - Accelerating
Downwards curve - Deccelerating
Perpendicular straight line - stationary

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5
Q

Acceleration equation

A

Acceleration=change in velocity/time

a=(v-a)/t

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6
Q

Final velocity equation

A

v^2=u^2+2ad

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7
Q

Velocity/time graphs

A

Velocity at zero = stationary
Sloping line = acceleration/deceleration
Straight line = constant speed

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8
Q

Force equation

A

Force = mass * acceleration

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9
Q

Inertial mass

A

Measurement of how difficult it is to change velocity defined as the ratio force/acceleration

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10
Q

What does negative force mean

A

It is slowing down moving forward

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11
Q

Def Mass

A

Mass is the measure of the amount of matter in the object

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12
Q

Def Weight

A

Weight is the force that the object experiences due to its mass and the gravitational field

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13
Q

Weight equation

A

Weight = mass * gravitational fields strength

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14
Q

Def Momentum

A

It is the tendency of an object to keep moving, how difficult it is to make something stop. The momentum of a moving object depends on its mass and its velocity. It is a vector quantity

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15
Q

Def Force

A

Force is the rate of change of momentum

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16
Q

Momentum equation

A 
Momentum = mass * velocity
p = m * v
17
Q

Force equation 2

A

Force = change in momentum / time
F=mv-mu/t
F=m(v-u)/t

18
Q

Deceleration in cars

A

When the mass or force of the deceleration of a vehicle is large. There are safety features such as seat belts and crumple zone

19
Q

Changing the size of force

A

Increasing time increases what m(v-u) is divided by, which reduces force.

20
Q

Action and Reaction

A

Newton’s third law states that for every action there is an opposite reaction. If you push a wall the wall exerts the same force back so they are in equilibrium. Need to be on different objects

21
Q

Conservation of momentum

A

The total momentum before is the same as the momentum after

22
Q

Def Stopping distance

A

Thinking distance + Braking distance

23
Q

Thinking distance

A

Thinking distance is the distance it takes for the driver to react to the situation and hit the brakes

24
Q

Braking distance

A

Braking distance is the distance it takes for the vehicle to come to a halt

25
Q

Things that affect thinking distance

A

Age
Alcohol
Drugs

26
Q

Things that affect braking distance

A

Road conditions
Vehicle
Weather

Revision 📚 (5 decks)

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