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Mariana2 > Science > Flashcards

Science Flashcards

1
Q

Yes or Not: “The astronauts have no weight at all in space.

A

Yes, they do

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2
Q

Why do astronauts seem to float in space?

A

Because their spacecrfat is moving along with them

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3
Q

Is a push or pull that acts on an object?

A

Force

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4
Q

Every force has a _______________

A

Strength or magnitud

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5
Q

What is the measure for the strenght?

A

Unit called newtons (N)

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6
Q

What is the Force?

A

Is a push or pull that acts on an object.

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7
Q

A force has a _______________

A

Direction

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8
Q

Can the forces change the way objects move?

A

Yes

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9
Q

What its the CONTACT FORCES?

A

A force that requires two piece of matter to touch

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10
Q

What is the FRICTION?

A

Is the force that result when two materials rub against each other or when their contyact prevents sliding.

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11
Q

Is the force that result when two materials rub against each other or when their contyact prevents sliding?

A

Is the Friction

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12
Q

What does the amount of friction between 2 objects depend on?

A

May depend of texture, shape, speed, and weight

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13
Q

Solids are not the only materials that can cause friction. The ___________and__________also resist motion an object pushes against them.

A

Air and water

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14
Q

What help that submarines and ship reduce friction and move through water easily?

A

Yor design, because your shapes help them

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15
Q

Is the force that acts at a distance into two or more objects?

A

Non contact forces

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16
Q

Give me exmaple for the non contac forces

A

Gravity, electricity forces and magnetics forces

17
Q

Is the forces of attraction between any objects?

A

Gravity

18
Q

How act the electric forces?

A

Act between objects that are electrically charged

19
Q

Magnets will pull strongly on objects made of:

A

Metals such, as iron, cobalt, and nickel.

20
Q

The magnets has two poles. What is the name?

A

North pole and South pole?

21
Q

Is the rate at which the speed or the direction of motion of an object changes over time?

A

ACCELERATION

22
Q

When we speak in accleration we refer only faster and faster?

A

No, in science the word acceleration means any change in motion.

23
Q

Motion without acceleration is called________________

A

Uniform motion

24
Q

What is the mean UNIFORM motion?

A

This word tell us that the motion no changed.

25
Q

What say the Newton’s first law?

A

That an object will stay in uniform motion unless a net force acts on the object.

26
Q

Is the tendency of an object to resist any change in motion?

A

Inertia

27
Q

True or false: Objects with lot of mass have LESS inertia that objects with less mass?

A

False, the objects with more mass have a MORE intertia.

28
Q

The second law describe how acceleration, mass and force are related.

A

FORCE is product of mass and acceleration.

29
Q

What is the formule that describe the relation betwenee Force, mass and acceleration

A

Force= Mass x Acceleration ( F= m x a)

30
Q

Is the unit of force in the metric system?

A

newton (N)

31
Q

Newton’s third law of motion states that when one object exerts a force on a second object, the seconf object exerts a force on the first. Give me a exmple

A

1.

32
Q

Newton’s first law say that…

A

An object stay in uniform motion unless a net force acts on the object

33
Q

Newton’s second law say that…

A

Describe how acceleration, mass and force are related

34
Q

Newton’s third law say that…

A

Describe when a object exerts a force on a second, the second object exerts on the first object

35
Q

What happen when two people combine their forces?

A

This combined force can have a bigger effect.

36
Q

What happen when two forces of equal strenght combine to act on the same object, but in opposite directions?

A

The force are the BALANCED

37
Q

Is when an area of partial darkness where ligt has been blocked by an object?

A

SHADOW

Mariana2 (8 decks)

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