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Science > Forces And Motion > Flashcards

Forces And Motion Flashcards

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0
Q

What can force cause an object to do

A

Move
Accelerate
Change speed or direction

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1
Q

What is a force

A

A push of pull that acts on an object

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2
Q

What is force measured in

A

Newtons

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3
Q

What is used to represent the direction and strength of a force

A

Arrows

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4
Q

What is the overall force acting on an object after all the forces are combined

A

Net force

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5
Q

Balanced forces have a net force of ______.

A

Zero

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6
Q

What happens when an unbalanced force acts on an object

A

It accelerates or changes direction

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7
Q

Vocab

A force that opposes the motion of objects that touch as they move past each other

A

Friction

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8
Q

All moving objects are subject to __________.

A

Friction

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9
Q

What friction force acts on objects that are NOT moving

A

Static friction

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10
Q

What direction does static friction act in

A

In the direction opposite the applied force

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11
Q

Compare sliding and static friction

A

Sliding friction takes less force that static friction. Sliding friction also acts in the opposite direction of the push.

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12
Q

What friction is caused by the floor and object being slightly bent out of shape as an object rolls

A

Rolling friction

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13
Q

Why are ball bearings used in machinery

A

To lesson the friction in machines

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14
Q

What friction opposes the motion of an object through a fluid

A

Fluid friction

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15
Q

How does fluid friction increase

A

It increases as the speed of the object moving through the fluids increase

16
Q

What is gravity

A

An attractive force that acts between any 2 masses

17
Q

When is gravity stronger

A

Masses involved are bigger/closer together

18
Q

Gravity causes falling objects to ________.

A

Accelerate downward

19
Q

Air resistance reduces ________.

A

Acceleration

20
Q

What is mass measured in

A

Kilograms

21
Q

Does mass change in space?

A

No

22
Q

Why would your weight change in space

A

Mass in space is different from mass on earth

23
Q

What did Isaac Newton publish

A

Principia

24
Q

What is the first law of motion also called

A

Law of inertia

25
Q

What is inertia

A

Tendency of an object to resist change in motion

26
Q

The more mass equals the more what

A

Inertia

27
Q

Mass is the measurement of _________ in an object

A

Inertia

28
Q

Second law of motion

A

Acceleration = net force divided by mass

29
Q

How do u find force

A

Force = mass x acceleration

30
Q

Acceleration always works in the same direction as __________.

A

Net force

31
Q

SI unit for acceleration

A

Newtons per kilogram

32
Q

Third law of motion

A

For every action there is an equal and opposite reaction

33
Q

How do you find momentum

A

Mass times velocity

34
Q

Units for momentum

A

Kilograms times meters per second

35
Q

Okay what is a closed system

A

A system where other objects and forces cannot enter or leave a system

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