Unit 4 - Centripetal Force and Gravity

Question 1

How can an object accelerate if it is travelling at a constant speed

Answer 1

If there are changes in the DIRECTION of motion

Question 2

ac =

Answer 2

v^2 / r

Question 3

What is centripetal force

Answer 3

The net force that acts on an object to keep it moving along a circular patch

Question 4

What is the equation for centripetal force

Answer 4

F_c = mv²/r = mrw²

Question 5

What is the symbol for angular velocity

Answer 5

w

Question 6

What is the equation for angular velocity (w)

Answer 6

v/r

Question 7

Show how Fc = mrw² is derived

Answer 7

From N2L F=ma => a= F/m

Circular motion - a = v²/r

So F/m = v²/r

F = mv²/r = mw²r²/r = mrw²