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Physics > Physics 3 - Forces in Action (P8 - P11) > Flashcards

Physics 3 - Forces in Action (P8 - P11) Flashcards

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1
Q

What is a vector quantity?

A

A physical quantity that has magnitude and direction.

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2
Q

What is a scalar quantity?

A

A physical quantity with magnitude but not direction.

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3
Q

What two forces are always exerted when two objects interact?

A

Equal and opposite

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4
Q

What is Newton’s first law of motion? Its about resultant force.

A

If the forces acting on an object are balanced the resultant force on the object is zero.

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5
Q

What does a moving object do if its resultant force is zero?

A

It will move at constant speed and direction.

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6
Q

What is the moment of a force?

A

A measure of the turning effect of the force on an object.

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7
Q

What is the equation for a moment about a pivot?

A

Moment (Newton metre Nm) = Force (Newtons n) x Perpendicular distance from the line of action of the force to the pivot (Metres m)

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8
Q

How do you increase the moment of a gear?

A

Use a small gear wheel to drive a larger gear wheel.

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9
Q

What is the centre of mass of an object?

A

The point where its mass can be thought of as being concentrated.

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10
Q

What is the equation for the speed of an object?

A

Speed (m/s) = distance (metres m) / time (seconds)

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11
Q

What is velocity?

A

Speed in any given direction. It is a vector quantity.

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12
Q

What is the acceleration of an object?

A

Acceleration (m/s squared) = Change in velocity (m/s) / time taken for the change (seconds)

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13
Q

What is deceleration?

A

The change of velocity per second when an object slows down.

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14
Q

What does the gradient of the line on a velocity time graph represent?

A

Acceleration.

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15
Q

What is the acceleration if a velocity time graph is a horizontal line?

A

Zero

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16
Q

What does the area under a velocity time graph represent?

A

Distance travelled.

17
Q

What does the gradient of a distance time graph show?

A

The speed of an object moving at constant speed.

18
Q

What is Newton’s second law? Its about acceleration.

A

The acceleration of an object is both proportional to the resultant force on the object and inversely proportional to the mass of the object.

19
Q

What is the equation for resultant force?

A

Resultant force (Newtons) = Mass (kg) x Acceleration (m/s squared)

20
Q

What is the inertia of an object?

A

Its tendency to stay at rest or in uniform motion. Force / Acceleration

21
Q

What is the equation for weight?

A

Weight (N) = Mass (Kg) x Gravitational field strength (N/Kg)

22
Q

What is terminal velocity?

A

The velocity it eventually reaches when it is falling. The weight of the object is then equal to the frictional force on the object.

23
Q

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

A

Zero

24
Q

What is the stopping distance of a vehicle and its equation?

A

The distance travelled while the vehicle is stopping.

Stopping distance = thinking distance + braking distance

25
Q

What is the equation for braking force? Same equation as resultant force.

A

Braking force = mass x acceleration

26
Q

What is the equation of momentum?

A

Momentum of a moving object (Kg m/s) = Mass (Kg) x speed (m/s)

27
Q

What is the equation for impact force when two vehicles collide?

A

Impact force (N) = change of momentum (kg m/s) / impact time (s)

28
Q

What is Hooke’s law?

A

The extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded.

29
Q

What is the equation for pressure?

A

Pressure (pascals Pa) = Force (Newtons N) / Area (Metres squared)

30
Q

What is the equation for pressure due to the column of height?

A

Pressure due to column of height (pascals Pa) = Height (metres m) x Density (Kg per cubic metre)

31
Q

What happens if the weight of an object is greater than the upthrust on it when fully immersed?

A

It will sink.

Physics (6 decks)

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