1B.1 Gravitational potential and Kinetic energies Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Gravitational potential energy

A

is the energy an object has by virtue of its position in a gravitational field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

kinetic energy

A

it is the energy an object has by virtue of its movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Gravitational potential energy =?

A

Mass kg x gravity N Kg^-1 x Height m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what us gpe considered

A

it is changes of gpe caused by the change of height Gpe = Mass kg x gravity N Kg^-1 x (change of )Height m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is Gravitational potential energy measured in

A

Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the gravitational field strength

A

It is the measure of a pull of gravity by a planet at a distance from its center. this is not a constant value since the strength of the Gravitational field strength experienced by mass is inversely proportional to the square of the distance from the planet’s centre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

kinetic energy =

A

Kinetic energy (J) = 1/2 x m (kg) x speed^2 = (v^2) ( m^2 s^-2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the principle conversation of energy

A

energy is never lost or gained therefore when transferring from kinetic energy to gravitational potential energy we would have mgh = 1/2 mv^2 dividing by both masses and rearranging we would get v= square root of 2gh and h = v^2/2g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how can we energy be transformed from kinetic energy to gravitational energy

A

E(g) can be transformed to E(k) if an object falls to a lower height and E(k) can be transformed to E(g) if an object is thrown upwards

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

following the principle of energy, how can we find how fast an object is traveling after falling from a certain distance

A

v= square root of g x (change of) height

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

following the principle of energy, how can we find how high an object could rise if project upwards at a certain speed

A

(change of) h = v^2/2g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

v= square root of g x (change of) height how does this confirm galileo’s theory

A

it shows that 2 objects from the same height can fall to the ground at the same rate regardless of their mass ( assuming that there isn’t any energy last in friction or air resistance)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly