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Physics > Forces > Flashcards

Forces Flashcards

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1
Q

What is a scalar?

A

A physical quality that has magnitude but no direction

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2
Q

Examples of scalars?

A

Speed/volume/temperature/hight

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3
Q

What is a vector?

A

A physical quantity that has both magnitude and direction

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4
Q

Examples of vectors?

A

Acceleration/force/displacement

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5
Q

What is acceleration?

A

The rate in change of speed or direction of an object

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6
Q

What is a force?

A

A force is a push or a pull that changes the shape/speed/direction of an object. Its unit is newtons.

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7
Q

What is Newton’s first law?

A

If the resultant force on a body is zero, the body will move at a constant speed.

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8
Q

What is Newton’s second law?

A

If the resultant force on a body is not equal to zero the body will accelerate according to the formula f=ma

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9
Q

What is weight measured in?

A

Newtons

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10
Q

What is mass measured in?

A

Kgs

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11
Q

What is the gravitational field strength on earth

A

10

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12
Q

What is stopping distance

A

Thinking distance + breaking distance

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13
Q

What is thinking distance

A

Time taken to press the brake after seeing a problem

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14
Q

What is breaking distance?

A

Time taken for car to stop after pressing the brakes

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15
Q

Factors affecting thinking distance?

A

-alcohol
-drugs
-age
-eyesight/ poor visibility
-fatigue

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16
Q

Factors affecting braking distance

A

-road conditions-wet/slippery
-condition of breaks/tyres
-speed of car
-mass of car

17
Q

What is hooks law?

A

Extension is proportional to the load applied.

18
Q

Explain hooks law?

A

This means if you stretch something with a steadily increasing force, the extension will increase steadily too

19
Q

What is terminal velocity?

A

the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

Physics (4 decks)

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