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Science Forces > Forces > Flashcards

Forces Flashcards

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1
Q

What is the SI unit that measures the strength of force

A

Newtons

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2
Q

What is a force

A

A push or pull

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3
Q

What is the overall force on an object called

A

Net force

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4
Q

What is and

Unbalanced force

A

A net force acting on an object

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5
Q

What can unbalanced forces called

A

Speed up
Slow down
Change direction

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6
Q

What is a balance force

A

Equal forces acting in opposite directions

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7
Q

What does a balanced force cause

A

Trick question

It will not change the objects motion

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8
Q

What happens when two forces act in the same direction

A

They add together

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9
Q

What is the net force when you add equal forces exerted in opposite directions

A

0

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10
Q

Describe how to combine unequal forces acting in opposite directions

A

You subtract the smaller force from the larger force. The direction of the resulting force is the direction of the larger original force

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11
Q

What is the difference between mass and weight

A

Mass- (kg) amount of matter in an object

Weight- (N) amount of force on an object due to gravity

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12
Q

Name the formula for calculating mass and weight on different planets like earth

A

Strength of gravitational field mass

Earth 9.8
Mass 50 kg

9.8x50=490(N) weight

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13
Q

What do we use to measure force

A

A Newton spring scale

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14
Q

What is the definition of friction

A

Friction is the force between two objects rubbing together

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15
Q

Name 2 ways forces are described

A

Strength

Direction in which they act

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16
Q

How does a cyclist reduce friction

A

Higher inflated tires

Smoother tires

Skinner tires

Less weight

Road condition

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17
Q

Give an example of kinetic energy into heat energy

A

Rubbing your hands together

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18
Q

What is the definition of streamlining

A

To reduce surface to surface resistance

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19
Q

What is the definition of minimizing surface contact

A

To reduce the rubbing area between two objects

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20
Q

What is the definition of lubrication

A

To apply wax, grease or oil to the rubbing surfaces between two objects

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21
Q

A toboggan slides down a hill. Is this work?

A

Yes

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22
Q

A weightlifter holds 200 kg mass motionless above his head. Is this work?

A

No because there is no movement being applied to the force.

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23
Q

You push on a car stuck in the snow. Is it work?

A

No because the car isn’t moving and you are pushing in the opposite direction as the force

24
Q

In order for you to do work on an object what has to happen?

A

The object has to move some distance as a result of your force

25
Q

The amount of work you do on an object depends on:

A

The amount of force you exert and the distance the object moves

26
Q

What formula do you use to determine the amount of work done on an object?

A

Force x Distance

27
Q

What is the SI unit of work

A

Newton x Meter

28
Q

What is the amount of work you do when you exert a force of 1 Newton to move an object a distance of 1 meter?

A

1 joule

29
Q

What is power?

A

Power is the rate at which work is done on an object.

Power equals the amount of work done on an object in a unit of time

example joules divided by second equals a watt

30
Q

What is the formula used to calculate power?

A

Power= work divided by time

Watt= joules divided by time

31
Q

What does the universal law of gravitation state ?

A

The force of gravity. Acts on all objects in the universe

32
Q

what is the definition of gravity?

A

The force that accelerates objects towards earth

33
Q

How does Oil between machine parts reduce friction?

A

It makes the surface smoother by changing from sliding friction to fluid friction.

34
Q

What kind of friction occurs when moving parts have ball bearings?

A

Rolling friction

35
Q

What kind of friction requires the most force to overcome, rolling friction ,sliding friction or fluid friction?

A

Sliding friction

Rolling friction

Fluid friction

36
Q

Fluid friction occurs when

A

An object moves through a liquid or gas

37
Q

Sliding friction occurs when

A

Solid surfaces slide over each other

38
Q

Rolling friction occurs when

A

An Object rolls over a surface

39
Q

Why does some fiction occur with seemingly smooth surfaces

A

The object is still being a rubbed against the surface. Therefore of force is still being applied

40
Q

Give the definition of Air resistance

A

Air resistance is the kind of friction that slows a falling object

41
Q

Give the definition of terminal velocity

A

A falling object reaches this when forces of gravity and air resistance are balanced

42
Q

What is the definition of freefall

A

The state that exists when the only force acting on an object is gravity

43
Q

Near the surface of Earth what is the acceleration of an object due to the force of gravity

A

9.8 m/s per second

44
Q

An object that is thrown is called a

A

Projectile

45
Q

What is the definition of work

A

A force that acts upon and objects to cause movement

Work = Work x distance

46
Q

Give the definition of energy

A

Energy is a quantity that describes the amount of work that can be performed by a force

47
Q

What are the different types of energy

A

Light heat sound Motion

48
Q

What is the definition of potential energy

A

Potential energy is the stored energy of position possessed by an object

49
Q

Give the definition of Kinetic energy

A

Kinetic energy is the energy of motion

50
Q

What is the law of conservation of energy ,when was it made and what does it apply to

A

Energy can’t be created or destroyed

Energy can be transferred or transformed

19th century

Applies to any system

51
Q

Mechanical advantage is the …..

A

Number of times a machine multiplies your effort force

52
Q

What is the formula for mechanical advantage

A

Input force in newtons
F in

53
Q

What is a machine

A

A machine is any mechanical system that reduces the force required to accomplish work

54
Q

What is input force

A

Input force is the work done by you

55
Q

What does a pulley do and what is the mechanical advantage

A

A fixed pulley only changes the direction between the input and output force

Mechanical advantage of one

Science Forces (1 decks)

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