Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > P1 - 1.4 Gravitational Potential Energy + Gravity > Flashcards

P1 - 1.4 Gravitational Potential Energy + Gravity Flashcards

1
Q

What is gravity

A

The force of attraction between 2 objects

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

What can affect a force of attraction between two forces in gravity

A

Mass
How far apart the objects are

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

Is gravity between 2 objects felt strongly or weak

A

Strongly

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

Is gravity between 2 far away objects felt strongly or weak

A

Weak

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

What is a gravitational field

A

Gravity having a big influence over nearby objects

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

What is gravity having a big influence over nearby objects called

A

Gravitational field

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

What is the strength or a gravitational field called

A

The gravitational field strength

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

What letter stands for gravitational field strength

A

g

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

Roughly what is earths gravitational field strength

A

9.8 Newtons/ Kg

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

Roughly what is the gravitational field strength of the moon

A

1.6 Newtons / Kg

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

Why is the moons gravitational field strength much smaller than earths

A

The moon is a lot smaller in size

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

What happens when an object enters a gravitational field

A

It experiences a force of attraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the force of attraction known as in physics

A

The weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How do we work out the weight of an object in gravitational potential energy

A

Mass x gravitational field strength = weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Scenario:
If a person was to stand on earth with a weight it 60kg
Assuming that the gravitational field strength is 9.8 N

A

Mass x gravitational field strength = weight
60x9.8=588N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is weight measured in

A

Newtons

17
Q

What is the difference between weight and mass in physics

A

Mass is an intrinsic property
Weight is the force acting on it in a gravitational field

18
Q

To lift up and object what is required

A

Energy or work

19
Q

When we lift up an object what is transferred to the gravitational potential energy store

A

Energy

20
Q

When we lift up an object where is energy transferred to

A

That objects gravitational potential energy store

21
Q

What is the calculation to find gravitational potential energy (Ep)

A

Ep = mgh
Gravitational potential energy = mass x gravitational field strength x height

22
Q

What is the unit for mass

A

Kg

23
Q

What is the unit for gravitational field strength

A

N/Kg
Newtons per kilogram

24
Q

What is the unit for height

A

Metres

25
Q

What is the unit for gravitational potential energy

A

Joules (J)

26
Q

If i were to drop an apple that has a mass of 100g from a height of 3 metres what would the gravitational potential energy be?

A

Ep=mgh
1) convert the units
100g —> kg = 100/1000= 0.1kg

2) put numbers into the calculation
0.1x9.8x3= 2.94J

27
Q

What can we think of when we talk about weight in physics

A

The force acting on an object due to gravity

28
Q

What can we think of when we refer to mass in physics

A

The amount of “stuff” we have

29
Q

What is the weight of a 70 kg object on earth?
(The Earth’s gravitational field strength is 9.8 N/kg)

A

Weight = mg
W = 70x9.8
=686N

30
Q

A car on earth experiences a downwards weight of 8820 N, what is the mass of the car?
(The Earth’s gravitational field strength is 9.8 N/kg)

A

W=mg
W = 8820N
G= 9.8N/kg
W/g = m
8820/9.8 = 900kg

31
Q

Tony has a mass of 65 kg on Earth. What is Tony’s mass on the moon?

A

The mass of an object is the same as anywhere in the universe

65kg

32
Q

True or False:

The mass of an object is the same anywhere in the universe.

A

True

33
Q

Tony’s mass is 65 kg. What is his weight on Earth?
(The Earth’s gravitational field strength is 9.8 N/kg)

A

W = mg
W = 65x9.8
W = 637N

34
Q

Tony’s mass is 65 kg. What is Tony’s weight on the moon?
(The moon’s gravitational field strength is 1.6 N/kg)

A

W = mg
W = 65 x 1.6
W = 104N

35
Q

Tony, who has a mass of 65 kg, climbed the stairs from the ground floor, up to the fourth floor, which is 20 m higher. How much gravitational potential energy did Tony gain?
(The Earth’s gravitational field strength is 9.8 N/kg)

A

Ep = mgh
M= 65kg
H= 20m
G= 9.8

Ep= 65x9.8x20
Ep = 12740J

36
Q

Freya, who has a mass of 60 kg, jumps from a boat into the sea. Just before she hits the water, she has lost 1,470 J of gravitational potential energy.

A

Ep = mgh
Ep = 1470
M = 60kg
G = 9.8
H = ?

Ep/mg = h
1470/60x9.8 = 2.5m

Physics (106 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions