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Complete the sentences using these words:

- potential

- mass

- height

- acceleration

• 1) changed

  2) potential

  3) acceleration

  4) mass

  5) height

• 1) changed

  2) acceleration

  3) mass

  4) height

  5) potential

• 1) changed

  2) height

  3) mass

  4) potential

  5) acceleration

• 1) changed

  2) mass

  3) potential

  4) height

  5) acceleration

The Law of Universal Gravitation describes an existing attraction, or gravitational force among ______ in the universe which decreases when the distance between the objects increases.

What's the missing word?

• objects

• materials

• houses

• places

Match the words to the pictures

• 1. C

  2. A

  3. B

• 1. B

  2. C

  3. A

• 1. B

  2. A

  3. C

• 1. A

  2. B

  3. C

What does make astronauts appear to float in space?

• none of the above

• ocean currents

• freefalling

• escape velocity

What are ocean currents?

• none of the above

• They're a kind of ocean in the space

• They're currents in the ocean

• They're determined by the rise and fall of tides in the ocean.

The speed necessary to break away from the gravitational force of an object is called ______

• escape velocity

• ocean currents

• freefalling

• gravity

Match the type of energy to the picture

• 1. b

  2. a

  3. a

• 1. a

  2. b

  3. a

• 1. b

  2. a

  3. b

• 1. b

  2. b

  3. a

Choose the correct explanation for the situation.

• Jordan will float because his mass has changed. It's gravitational force will not pull him toward the Earth's center, because the moon's gravitational force will pull him towards it's center

• Jordan will feel like he's floating, but not because his mass has changed. It'll be because due to Eart's larger mass, it's gravitational force will continue pulling him toward the Earth's center, while the moon's gravitational force will be pulling him towards the moon's center

• Jordan will faint because he can't go to the moon

• none of the above

Calculate the gravitational potential energy (PEgrav) if the Jordan´s height from the ground id 5.6m

• Bike's mass= 11.63kg

  Total mass= 70kg + 11.63kg = 81.63kg

  PEgrav= 81.63kg x 9.8 x 5.6 m= 4,479.85 Joules

• Bike's mass= 15.60kg

  Total mass= 70kg + 15.60kg = 85.60kg

  PEgrav= 85.60kg x 9.8 x 5.6 m= 4,697 Joules

• Bike's mass= 12.50kg

  Total mass= 70kg + 12.50kg + 82.50kg

  PEgrav= 82.50kg x 9.8 x 6.6 m= 5,336 Joules

• Bike's mass= 11.63kg

  Total mass= 70kg + 11.63kg = 81.10kg

  PEgrav= 81.10kg x 9.8 x 5.6 m= 4,483.85 Joules

Read and complete

• 1- Energy

  2- matter

  3- non-renewable

  4- renewable

  5- potential

  6- PEgrav

  7- mass

  8- gravity

  9- escape velocity

  10- freefalling

• 1- Energy

  2- matter

  3- renewable

  4- non-renewable

  5- PEgrav

  6- potential

  7- gravity

  8- mass

  9- freefalling

  10- escape velocity

• 1- Energy

  2- potential

  3- non-renewable

  4- renewable

  5- gravity

  6- PEgrav

  7- matter

  8- freefalling

  9- escap velocity

  10- mass

• 1- Energy

  2- escape velocity

  3- PEgrav

  4- renewable

  5- non-renewable

  6- potential

  7- gravity

  8- matter

  9- freefalling

  10- mass