TENSION & UPTHRUST

Question 1

What is a spring?

Answer 1

A device that stores elastic potential energy. It obeys a law called Hooke’s Law.

Question 2

Stretching a string makes it ________, and compression a spring makes it _________.

Answer 2

pull back ; push out

Question 3

What is the formula for Hooke’s Law?

Answer 3

k = f/x

k = spring constant
f = spring force
x = spring stretch/compression

Question 4

What is Hooke’s Law?

Answer 4

The extension of a spring is directly proportional to the force.

Question 5

What is upthrust also known as?

Answer 5

Buoyant force

Question 6

What is upthrust?

Answer 6

Acts on an object when partially or fully immersed in a liquid or gas

Question 7

What does upthrust depend on?

Answer 7

• Density of fluid
• Volume displaced

Question 8

What is the Archimedes’ principle?

Answer 8

Upward buoyant force that is equal to the weight of the fluid displaced by the object

Question 9

For a boat to float:

Answer 9

upthrust = weight

Question 10

What is the weight of water?

Answer 10

1L = 1kg

Question 11

For a boat to sink:

Answer 11

weight > upthrust