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Science Force Flashcards

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1
Q

Force

A

A push or a pull

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2
Q

Net force

A

the combination of all forces acting on a object

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3
Q

Force is described by

A

Its strength and by the direction in which it acts

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4
Q

SI units for force

A

Newtons

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5
Q

Formula for force

A

F= M x A

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6
Q

1N = ___ kg x ____ m/s/s

A

????

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7
Q

What do scientist use to represent a force?

A

F or an arrow

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8
Q

The device you used to measure force with your shoe

A

Spring scale

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9
Q

What are balanced forces?

Give example

A

When two equal forces act in opposite directions to cancel each other out.
Two people pushing on a box across from each other and the box does not move

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10
Q

What are unbalanced forces?

Give example

A

Forces acting on an object result in a change in motion

You and Laura pushing against each other on a box

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11
Q

Newton’s 3 Laws of Motion

A
  1. Object at rest will remain at rest. Object in motion will stay in motion
  2. Acceleration depends on the objects mass and on the net force acting on the object (A= F/M)
  3. For every action there is an equal and opposite reaction
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12
Q

Inertia

A

tendency to resist change in motion

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13
Q

SI units for mass

A

kg

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14
Q

SI units for velocity

A

m/s

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15
Q

Calculate Acceleration

A

A = F / M

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16
Q

How can you change the acceleration of an object?

A

Change the force used to move it. (Push or pull harder or lighter)

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17
Q

Friction

A

Force that two surfaces exert on each other when they rub against each other

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18
Q

Rolling friction definition

give an example

A

when an object rolls across a surface

skateboard, bike, tires

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19
Q

Sliding Friction Definition

give example

A

When two solids surfaces slide over each other.

Sand on ice to keep from falling, brake pad on tires, your skin on concrete when you crash bike

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20
Q

Fluid friction definition

Give example

A

Occurs when solid moves through a liquid.

Surf board, water ski, bike helmet with air

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21
Q

Static Friction

Give example

A

Friction that acts on objects that are not moving.

Pushing heavy desk that wont move

22
Q

Four types of friction

A
  1. Fluid
  2. Rolling
  3. Sliding
  4. Static
23
Q

Weight

A

Force of gravity on a person or object at the surface of a planet

24
Q

Mass

A

measure of the amount of matter in an object

25
Q

Acceleration due to gravity

A

9.8 m / s*s

26
Q

Terminal velocity

A

the greatest velocity a falling object reaches

27
Q

Air resistance

A

Fluid friction that objects experience falling through the air.
Remember that air resistance is an upward force on an object falling down

28
Q

Free fall

A

When the only force on an object is gravity

29
Q

Law of Universal Gravitation

A

The force of gravity acts between all objects in the universe. Gravity acts everywhere not just on Earth.

30
Q

Convert a weight into Newtons

A

1 lb = .45kg (1N=.224lbs)

31
Q

Formula for momentum

A

Momentum = mass x velocity

32
Q

Law of Conservation of Momentum

A

In the absence of outside forces - the total momentum of objects that interact does not change.
The amount of momentum is the same before and after they interact

33
Q

Example of outside force

A

Friction

34
Q

Which of Newton’s Laws explains how a rocket lifts off?

A

Gas force exerts an equal but opposite reaction force on the rocket (Newtowns 3rd law)

35
Q

What is a satellite

A

Any object that orbits another object in space

36
Q

Name a natural satellite

A

asteroid

37
Q

Three purposes of artificial satellites

A
  1. Communication
  2. Weather analysis
  3. GPS
38
Q

Name the artificial satellite for scientific research?

A

International Space Station

39
Q

What two forces act on satellites?

A
  1. Centripetal force

2. Gravitational force

40
Q

When an unbalanced force acts on an object the force

A

changes the motion of the object

41
Q

Air resistance is what type of friction?

A

Fluid friction

42
Q

Which of the following is not a projectile?

satellite, thrown ball, ball on the ground, soaring arrow

A

ball on the ground

43
Q

The resistance of an object to any change in its motion is called

A

inertia

44
Q

The product of an objects mass and its velocity is called the object’s

A

momentum

45
Q

T/F

Balanced forces are equal forces acting on an object in opposite directions

A

True

46
Q

T/F

Rolling friction occurs when two solid surfaces slide over each other

A

True

47
Q

T/F

The greatest velocity a falling object reaches is called its momentum

A

False

Its Terminal Velocity

48
Q

T/F

The law of universal gravitation states that the total momentum of objects that interact does not change

A

Universal law of momentum

49
Q

T/F

The type of force that causes a satellite to orbit earth is a centripetal force

A

True

50
Q 
Type            Occurs                  Example
of Friction     When
static              
sliding
rolling
fluid
A

static object not moving pushing heavydesk
sliding two against other skin wrecking bike
rolling one rolls against other skateboard
fluid solid thru liquid bike helmet air or ski

Science Force (1 decks)

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