P2.1 Forces and their effects (3)

Question 1

The faster an object moves through a fluid, the…

Answer 1

…greater the frictional force

Question 2

What will happen to an object falling through a liquid? (4)

Answer 2

• Will initially ACCELERATE
• because of GRAVITY
• Soon, resultant force = 0
• Reaches TERMINAL VELOCITY

Question 3

What are the units for gravitational field strength?

Answer 3

N/kg

Question 4

What can change an objects shape?

Answer 4

A force (like in a car crash)

Question 5

What happens when a force is applied to a elastic object?

Answer 5

The object will STRETCH and store ELASTIC POTENTIAL energy (e.g. a spring)

Question 6

What happens to the elastic potential energy in an object that can RECOVER it’s shape?

Answer 6

• EPE is stored in object

- When work is done on the object

Question 7

What is the extension of an elastic object directly proportional to?

Answer 7

The force applied

Question 8

What is k in the equation ‘F=k×e’?

Name the units that it’s measured in.

Answer 8

The spring constant

N/m

Question 9

What is e in the equation ‘F=k×e’?

Name the units that it’s measured in.

Answer 9

Extension

m