Y7 U3 Revision

Match the following key terms to their definitions

• contact force

• the force from a surface of an object that is equal and opposite to the weight of the object

• gravity

• the quantity of matter in an object

• weight

• mass x gravity, force of gravity on an object

• tidal force

• force from gravitational pull of the sun and moon that causes the rise and fall of water level on Earth

• mass

• found around any object with a mass that causes weight and a force of attraction on other masses

Match the following key terms with their definitions

• earth tide

• the distance from the bottom of the ocean to the surface of the ocean, how deep the ocean is

• tidal force

• rise and fall of the land surface as the result of tidal forces

• tide

• the force from the gravitational pull of the Sun and Moon that causes tides

• tidal range

• difference in depth of water between high tide and low tide

• depth

• daily rise and fall in the ocean and land depth caused by gravity from the Moon and the Sun

Match the following measurements with their units

• degrees Celsius (oC)

• temperature

• Newtons per kg (N/kg)

• weight

• newtons (N)

• energy

• joules (J)

• gravity

• kilograms (kg)

• mass

Organize these options into the right categories

Groups:

(a) Mass

,

(b) Weight

,

(c) Gravity

• does not change when you go to different planets

• always pulls objects towards the center of Earth

• is not affected by gravity

• is the quantity of matter in an object

• property of a planet that makes the planet have gravity

• Can be calculated by mass x gravity

• is 10N/kg on Earth

• measured in kg

• measured with a force meter

• Can be calculated by taking Weight / Mass

• the more mass, the more this will impact the force of attraction of a Planet

• measured in newtons

• affected by the strength of gravity on planets

• is equal to the contact force

• of an object decreases as the object goes further away from the center of Earth

• measured with a scale or balance

Which system has the greater gravitational attraction between the two objects (if any)?

• System A
• System B
• Same gravitational attraction fro System A and System B

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Which System has the greater gravitational pull between the two objects?

• System 1
• System 2
• Same: there is no gravitational attraction between the two objects

Tags

NGSS.MS-PS2-4

A person would weigh less on on the Moon than on the Earth because . . .

• Moon has more mass, and therefore more gravity
• Moon has less mass, and therefore more gravity
• Moon has more mass, and therefore less gravity
• Moon has less mass and therefore less gravity

Tags

NGSS.MS-PS2-4

Earth's gravity pulls everything toward:

• North

• West

• East

• The center of the earth

This diagram can be used to indicate which of the following for a book sitting on table? (TWO correct answers)

a

b

c

Object not moving

weight

contact force

object moving

This unknown figure is called DermDem standng on the ground. Identify which diagram is correct AND explain why the other ones are incorrect.

• C

• The arrows are drawn incorrect for contact force and weight. They should be swapped.

• B

• This is the correct drawing for contact force and weight

• D

• This one is showing that dermdem would be floating upwards due to having too many followers on tiktok.

• A

• This one is showing the object would be sinking into the ground or table