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Science Revision > Forces > Flashcards

Forces Flashcards

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1
Q

What force is acting on you when you are sitting on a stool?

A

Reaction Force

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2
Q

What force is acting on you as you brake on a bike?

A

Friction

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3
Q

What is the formula for Density?

A

Mass divided by Volume

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4
Q

What is the formula for Speed?

A

Distance divided by Time

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5
Q

What is the formula for Weight?

A

Mass X Gravity

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6
Q

A force can be a push, pull or …

A

Twist

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7
Q

What do you use to measure force?

A

A Newton Meter

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8
Q

What unit do you use to measure Force?

A

Newtons

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9
Q

What is air resistance also known as?

A

Drag

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10
Q

What is a balanced force?

A

Forces acting on an object that are the same size but act in opposite directions

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11
Q

What is Thrust?

A

A push caused by an engine

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12
Q

What are the two forces acting on a stationary rubber duck, sitting on a still lake?

A

Water Resistance and Weight

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13
Q

What are the two forces acting on a hot air balloon, traveling at a constant height?

A

Air Resistance and Lift

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14
Q

As well as Reaction Force and Weight, what two other forces are acting on a car, driving at a constant speed along a racetrack? (NOT COUNTING FRICTION)

A

Air Resistance and Thrust

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15
Q

Every 100g of mass weighs …

On earth

A

1N

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16
Q

Gravity is measured in …

A

N/kg

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17
Q

The earth’s gravity is…

A

9.8

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18
Q

If an object has balanced forces then it is either…

A

Stationary or traveling at a constant speed

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19
Q

What is Weight measured in?

A

Newtons

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20
Q

What is mass measured in?

A

Kilograms

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21
Q

What is friction?

A

A force caused by contact between surfaces that resists movement

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22
Q

What would be the two forces acting on a magnetic pen?

A

Magnetic force and Weight

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23
Q

When forces are unbalanced, an object will either…

A

Speed up or slow down

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24
Q

If you were pushing a box along the ground, apart from push and weight, what would the other two forces be? (NOT COUNTING FRICTION)

A

Air resistance and Reaction Force

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25
Q

What is Reaction Force?

A

The support force provided by a solid surface like a floor or tabletop

26
Q

What is Speed measured in?

A

m/s (meters per second. Also can be kilometers per hour, miles per hour, etc)

27
Q

How can you reduce friction?

A

Lubrication and Streamlining

28
Q

What is elastic extension?

A

When an object changes shape and reverts back to the original shape

29
Q

What is inelastic extension?

A

When an object changes shape and does not revert back to the original shape

30
Q

Do rubber bands obey hooke’s law?

A

No

31
Q

What is hooke’s law?

A

The extension of an elastic object is directly proportional to the force applied

32
Q

What does directly proportional mean?

A

Where a line is straight and passes through the origin

33
Q

What equation links the force applied to a spring and how far it extends?

A

F=ke

34
Q

What does “k” mean?

A

Spring constant

35
Q

What symbol does the spring constant have?

A

k

36
Q

Name 3 non contact forces

A

Magnetic, electrostatic, weight

37
Q

What is the difference between mass and weight?

A

Mass - amount of matter

Weight-amount of force acting on an object due to gravity

38
Q

What do unbalanced forces do?

A

Make an object accelerate or decelerate

39
Q

What is a force?

A

A force is a push, pull or twist acting on an object caused by interaction w/ another object

40
Q

What can forces do?

A

Forces can make things change direction, speed or shape

41
Q

What do you call a force diagram?

A

Free body diagrams

42
Q

What is a vector quantity?

A

Something that has magnitude and direction

43
Q

What type of quantity is force?

A

Vector

44
Q

What are scalar quantities?

A

Things with only magnitude but no direction

45
Q

What are some examplesr of scalar quantities?

A

Mass, speed, distance, time, temperature

46
Q

What are some examplesr of vector quantities?

A

Force, velocity, displacement, acceleration, momentum,

47
Q

What happens when two objects interact?

A

There is a force produced on both objects

48
Q

What is an interaction pair?

A

A pair of forces that are equal and opposite and act on two interacting objects

49
Q

Is mass a force?

A

NO

50
Q

Is weight a force?

A

YES

51
Q

delete this

A
52
Q

Name two things that are directly proportional

A

Mass+weight,extension and force applied (spring)

53
Q

Will you weigh more on the earth or the moon?

A

Earth

54
Q

1N is equivalent to how many grams?

A

1kg

55
Q

If something has a mass of 55kg, what is its weight?

A

539 (multiply by 9.8)

56
Q

What does the spring constant tell us about a spring?

A

the stiffness

57
Q

What is the unit of the spring constant?

A

N/m

58
Q

What is the formula for force applied on a spring?

A

f=ke

59
Q

Which force acts upwards on a boat sitting in water?

A

Upthrust

60
Q

what is the unit of gravitational field strength?

A

N/Kg

61
Q

Which equation links density, mass and volume?

A

density = mass / volume

Science Revision (59 decks)

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