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Physics > 5-Forces (2) > Flashcards

5-Forces (2) Flashcards

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1
Q

What is a force?

A

A push or pull that acts on an object due to the interaction with another object. It’s a vector quantity

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2
Q

What is a contact force?

A

A force where the objects are physically touching

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3
Q

What is a non-contact force?

A

A force where the objects are physically seperated

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4
Q

What are some examples of contact forces?

A

*Friction
*Air resistance
*Tension
*Normal contact force

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5
Q

What are some examples of non-contact forces?

A

*Gravitational force
*Electrostatic force
*Magnetic force

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6
Q

What is a vector?

A

A vector quantity has both magnitude and direction

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7
Q

What are examples of vector quantities?

A

*Force
*Velocity
*Displacement
*Acceleration
*Momentum

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8
Q

What is a scalar quantity?

A

A scalar quantity only has magnitude, no direction.

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9
Q

What are examples of scalar quantities?

A

*Speed
*Distance
*Mass
*Temperature
*Time

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10
Q

What does the length and direction of an arrow show when representing Vectors?

A

*Length shows magnitude
*Direction shows direction of the vector quantity

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11
Q

What does gravity do?

A

*On surface of planet, makes everything fall to the ground
*gives everything a weight

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12
Q

What is the definition of weight?

A

The force acting on object due to gravity

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13
Q

What is gravitational field?

A

The force of gravity close to the earth

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14
Q

What does the weight of an object depend on?

A

The gravitational field strength at the point where the object is

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15
Q

How can weight of an object be calculated?

A

Weight=mass X gravitational field strength (weight in N, mass in kg, grav field strength in N/kg)

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16
Q

What is centre of mass?

A

Point on an object that weight is considered to be acting

17
Q

How is weight measured?

A

A newtonmeter (calibated spring-balance)

18
Q

What is the resultant force?

A

A single force that has the same effect of all original forces replacing a number of forces acting on an object.

19
Q

What is work done?

A

A force causing an object to move through a distance

20
Q

What are the units for the work done equation?

A

Work done in Joules, Force in Newtons, distance in meters

21
Q

What is one joule equivalent to?

A

1 Joule=1 newton metre
*one joule work done when one newton causes displacement of one metre

22
Q

What happens when work is done against the frictional forces acting on an object?

A

It causes a rise in temperature on the object.

Physics (9 decks)

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