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Nat 5 Physics > Dynamics And Space > Flashcards

Dynamics And Space Flashcards

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1
Q

Scalar

A

Magnitude

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2
Q

Vectors

A

Magnitude and direction

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3
Q

Examples of scalar

A 
Mass
Time
Energy
Distance
Speed
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4
Q

Examples of vector

A 
Weight
Force
Momentum 
Displacement 
Velocity
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5
Q

Acceleration

A

Velocity of an object change each second

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6
Q

What does force change

A

The speed
Direction or
Shape
Of an object

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7
Q

What is weight

A

The force that pulls objects down to the center of the earth

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8
Q

What is friction

A

The force which acts between touching surfaces and tries to stop them moving

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9
Q

What is tension

A

The force carried through a stretched rope or wire

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10
Q

What is gravitational field strength

A

The downward force acting on one kilogram of mass

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11
Q

What is Newton’s first law

A

If the forces on an object are balanced the motion of an object does not change

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12
Q

What is Newton’s second law

A

If an unbalanced force acts on a mass the mass accelerates

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13
Q

What is terminal velocity

A

When forces are balanced and an object is traveling at a constant velocity

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14
Q

What is Newton’s 3rd law

A

When you apply a force on an object the object will apply and equal and opposite force back on you

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15
Q

What is a projectile

A

An object with both horizontal and vertical velocities

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16
Q

What happens to the horizontal motion

A

It travels at a constant speed

17
Q

What happens to vertical motion

A

Accelerates downwards at 9.8ms-2

18
Q

Why do astronauts appear to be floating

A

The space station astronauts are in is in free fall

It still has horizontal velocity which prevents it from crashing down to earth

19
Q

What happens if a space shuttle reenters the atmosphere at a too shallow angle

A

It is reflected

20
Q

What happens if a space shuttle reenters at to steep an angle

A

It burns up

21
Q

What is instantaneous speed

A

The speed at one particular point

Nat 5 Physics (4 decks)

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