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8th Grade > Physics and of unit test review > Flashcards

Physics and of unit test review Flashcards

1
Q

What is the formula for net force

A

mass x acceleration

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2
Q

What is the formula for mass

A

Force ÷ acceleration

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3
Q

What is the formula for acceleration

A

Force ÷ mass

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4
Q

Balanced forces are equal in ____ and _____

A

Balanced forces are equal in force and size

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5
Q

Speed and direction which the object is moving is the definition of what?

A

Velocity

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6
Q

What is a change in speed or direction over time?

A

Acceleration

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7
Q

Acceleration unit?

A

Always squared

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8
Q

If you have 10 newtons to right and 4 to left what is net force/

A

6 N to the left

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9
Q

If you have 10 newtons right and 4 right what is net force?

A

16 to the right

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10
Q

There is 30 N force applied to a car. Of the force decreases what happens to the speed?

A

Decreases

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11
Q

There is 30N force applies to a car. If the force increases what will happen to the speed?

A

Increases

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12
Q

Example of a change in velocity

A

Making a turn around a mountain

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13
Q

How much force is needed to accelerate a 10 kg ball to a rate of 2m/s^2

A

20 N (F = mass x acceleration

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14
Q

What is kinetic energy?

A

Energy in motion, actively using energy for movement.

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15
Q

An object in motion will stay in motion. What is this?

A

Inertia

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16
Q

What is speed

A

The rate of change of position of an object in any direction.

17
Q

How is speed calculated

A

Speed = distance ÷ time

18
Q

How does friction affect forces in motion

A

It slows them down and eventually makes them come to a stop.

19
Q

What is acceleration

A

Increase or decrease in the rate or speed of something.Acceleration is also something that stays at a constant speed

20
Q

What is Newton’s first law?

A

And object at rest stays at rest or an object in motion stays in motion until an unbalanced force act upon psi it.

21
Q

What is Newton’s second law?

A

The acceleration of an object depends on the objects mass and the magnitude of the force acting upon it.

22
Q

What is Newton’s third law?

A

For action there is an equal and opposite reaction.

23
Q

What unit is energy measured in?

A

Joule (J) - how much energy is needed for change within a system

24
Q

What is potential energy?

A

Energy that is stored in a system

25
Q

On a distance and time graph, what axis is time on?

A

X-Axis

26
Q

On a distance and time graph, what axis is distance on?

A

Y-Axis

27
Q

What does speed describe?

A

How fast an object is moving

28
Q

On a distance-time graph what does the line of an object at rest look like.

A

Straight

29
Q

On a distance-time graph what does the line of an object increasing speed look like?

A

The line would be rising

30
Q

How is the steepness of the lines slope related to speed on a distance-time graph?

A

The faster the object moves, the steeper the line

8th Grade (6 decks)

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