Dynamics & Space - Definitions Flashcards Preview

Nat 5 Physics > Dynamics & Space - Definitions > Flashcards

Flashcards in Dynamics & Space - Definitions Deck (25)
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1
Q

Speed

A

the distance travelled by an object in one second

2
Q

Velocity

A

the discplacement of an object in one second

3
Q

acceleration

A

the change in velocity in one second

4
Q

Kinetic Energy

A

the energy an object has due to it moving, which depends on the objects mass and velocity

5
Q

Potential Energy

A

the stored energy of an object when it is lifted a height,h, above the ground

6
Q

gravitational field strength

A

the weight of 1kg

7
Q

Scalar

A

a quantity with a magnitude (size) only.

8
Q

Vector

A

a quantity with direction and magnitude

9
Q

Balanced forces

A

the forces acting on an object are equal in size and opposite in direction

10
Q

Newton’s 1st law

A

when the forces acting on an object are balanced, the object will remain at rest or continue to move in a straight line at a constant velocity

11
Q

Newton’s 2nd Law

A

when the forces acting on an object are unbalanced, the object will accelerate
the object’s acceleration is directly proportional to the unbalanced force acting on it

12
Q

Newton’s 3rd Law

A

If A exerts a force on B then B exerts and equal but opposite force on A

13
Q

Big Bang

A

a theory for the formation of the universe, which ocured around 13.7 billion years ago

14
Q

Planet

A

a celestial body in orbit around the sun with a nearly round shape, which has cleared the neighbourhood around it’s orbit and is not a satellite

15
Q

Dwarf Planet

A

a celestial body in orbit around the sun with a nearly round shape, which has NOT cleared the neighbourhood around it’s orbit and is not a satellite

16
Q

moon

A

a celestial body that orbits a planet

17
Q

sun

A

the star at the centre of our solar system

18
Q

star

A

a ball of gas which produces heat by nclear fusion

19
Q

asteroid

A

a small rocky object which orbits the sun (many asteroids can be found between the orbits of mars & Jupiter)

20
Q

the solar system

A

the sun and all the smaller objects which orbit it, incluing the eight planets and their moons

21
Q

exoplanet

A

(aka extrasolar planet) a planet outside out solar system that orbits a star

22
Q

galaxy

A

a system of billions of stars, gas and dust held together by gravity

23
Q

universe

A

all existing matter and space

24
Q

light year

A

the distance travelled by light in one year

25
Q

geostationary satellite

A

a satellite with a period of 24 hours, orbiting the earth at an altitude of 36,000 km