All about Gravity and Friction

Will a bowling ball & feather fall at the same time?

• Yes, they will fall at the same time in a vacuum.

• No, the apple will fall faster due to its weight.

• Yes, they will fall at the same time in air.

What happens when objects of different sizes, like a volleyball and a tennis ball, are dropped from the same height?

• The volleyball hits the ground first.

• The tennis ball hits the ground first.

• Both hit the ground at the same time.

Gravity is the force of attraction between objects due to masses.
What is the unit of gravity?

• The unit of gravity is Newton (N).

• The unit of gravity is Weight (W).

• The unit of gravity is
  Mass (m).

What is the average acceleration of gravity on Earth?

• 9.807 m/s²

• 27.807 m/s²

• 16.807 m/s²

What is the HIGHEST pressure (units: pounds per square inch or psi) most people experience on Earth?

• 14 psi

• 16 psi

• 18 psi

What changes based on gravity?

• Mass

• Weight

• Density

Label the points of an Earthquake discussed in class.

a

b

c

d

Fault (the fracture line in the Earth)

Seismic Waves (the energy wave)

Focus

Epicenter

​ (a)   waves can travel through both liquid and solid materials. But ​ (b)   waves can only travel through solid materials.

• Primary (P)
• Secondary (s)

​ (a)   waves move by compression and (b)   waves move side-to-side.

• Primary (P)
• Secondary (s)

Match the effects of Gravity with their correct explanation

Groups:

(a) Weight

,

(b) Falling Objects

,

(c) Stability

,

(d) Ocean Tides

• When you drop an object, it falls to the ground due to gravity

• Gravity gives objects their weight by pulling objects towards Earth

• Tides are created by gravitational pull of the moon and sun

• Gravity prevents everything and everyone on Earth from floating away