P1 - 1.4 Gravitational Potential Energy + Gravity

Question 1

What is gravity

Answer 1

The force of attraction between 2 objects

Question 2

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

Answer 2

Mass
How far apart the objects are

Question 3

Is gravity between 2 objects felt strongly or weak

Answer 3

Strongly

Question 4

Is gravity between 2 far away objects felt strongly or weak

Answer 4

Weak

Question 5

What is a gravitational field

Answer 5

Gravity having a big influence over nearby objects

Question 6

What is gravity having a big influence over nearby objects called

Answer 6

Gravitational field

Question 7

What is the strength or a gravitational field called

Answer 7

The gravitational field strength

Question 8

What letter stands for gravitational field strength

Answer 8

g

Question 9

Roughly what is earths gravitational field strength

Answer 9

9.8 Newtons/ Kg

Question 10

Roughly what is the gravitational field strength of the moon

Answer 10

1.6 Newtons / Kg

Question 11

Why is the moons gravitational field strength much smaller than earths

Answer 11

The moon is a lot smaller in size

Question 12

What happens when an object enters a gravitational field

Answer 12

It experiences a force of attraction

Question 13

What is the force of attraction known as in physics

Answer 13

The weight

Question 14

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

Answer 14

Mass x gravitational field strength = weight

Question 15

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

Answer 15

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

Question 16

What is weight measured in

Answer 16

Newtons

Question 17

What is the difference between weight and mass in physics

Answer 17

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

Question 18

To lift up and object what is required

Answer 18

Energy or work

Question 19

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

Answer 19

Energy

Question 20

When we lift up an object where is energy transferred to

Answer 20

That objects gravitational potential energy store

Question 21

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

Answer 21

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

Question 22

What is the unit for mass

Answer 22

Kg

Question 23

What is the unit for gravitational field strength

Answer 23

N/Kg
Newtons per kilogram

Question 24

What is the unit for height

Answer 24

Metres

Question 25

What is the unit for gravitational potential energy

Answer 25

Joules (J)

Question 26

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?

Answer 26

Ep=mgh 1) convert the units 100g —> kg = 100/1000= 0.1kg 2) put numbers into the calculation 0.1x9.8x3= 2.94J

Question 27

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

Answer 27

The force acting on an object due to gravity

Question 28

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

Answer 28

The amount of “stuff” we have

Question 29

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

Answer 29

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

Question 30

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)

Answer 30

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

Question 31

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

Answer 31

The mass of an object is the same as anywhere in the universe 65kg

Question 32

True or False: The mass of an object is the same anywhere in the universe.

Answer 32

True

Question 33

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

Answer 33

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

Question 34

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)

Answer 34

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

Question 35

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)

Answer 35

Ep = mgh M= 65kg H= 20m G= 9.8 Ep= 65x9.8x20 Ep = 12740J

Question 36

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.

Answer 36

Ep = mgh Ep = 1470 M = 60kg G = 9.8 H = ? Ep/mg = h 1470/60x9.8 = 2.5m