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Question 1

Linear Acceleration vs Centripetal Acceleration

Answer 1

• Linear Acceleration corresponds to a change in speed of an object
• Centripetal Acceleration (Radial) corresponds to a change in direction of an object
  
  • They can both change the speed or direction of an object

Question 2

Characteristics of uniform circular motion - the net force

Answer 2

The net force, ΣF, changes the direction only
The net force, ΣF, is constant in magnitude

Question 3

How can you find instataneous velocity in uniform circular motion

Answer 3

Instataneous velocity is always tangent to the circle

Question 4

How can you find acceleration in uniform circular motion

Answer 4

Acceleration is always directed toward the centre and at a constant magnitude

Question 5

When on a merry-go round, why does it feel like your being thrown outward

Answer 5

• By Newton’s 1st law, your body wants to continue in the direction of V, which is tangential to the circle
  
  • Thus, making it feeling like you are moving outward

Question 6

What is gravity and how does it occur

Answer 6

• Gravity is the force between 2 masses
  
  • occurs as an “action at a distance”

Question 7

What is a satellite

Answer 7

Any object that remains in a stable orbit around a much larger object

Question 8

Why do satellites orbit

Answer 8

Orbit due to the constant presence of a field force; gravitational field

Question 9

Why must satellites orbit at least 150km above earth surface

Answer 9

to avoid enough air friction to maintain a stable orbit