10.2- KINETIC ENERGY AND POTENTIAL ENERGY

Question 1

What is kinetic energy?

Answer 1

energy of object due to its motion

Question 2

What happens to KE the faster an object moves?

Answer 2

the more KE it has

Question 3

What is the equation for KE?

Answer 3

1/2mv^2

Question 4

What is potential energy?

Answer 4

energy of object due to its position

Question 5

Equation for work done to raise an object/ change of gravitational potential energy?

Answer 5

mgΔh

Question 6

What happens to an object of mass m released above ground if the air resistance is negligible?

Answer 6

object gains speed as it falls

Question 7

When object of mass m released above ground and air resistance negligible + object gains speed as it falls, what happens to its potential energy + KE?

Answer 7

its potential energy decreases + its KE increases

Question 8

What would the KE + potential energy of an object eventually be like once falling through the vertical height of Δh?

Answer 8

1/2mv^2 = mgΔh

Question 9

Equation of KE with pendulum bob?

Answer 9

1/2mv^2 = mg(h0 - h)

h0- initial height above equilibrium position
h- height above equilibrium position

Question 10

What is the kinetic energy with a pendulum bob equal to?

Answer 10

loss of potential energy from maximum height

Question 11

What is the work done to overcome friction + air resistance? (fairground vehicle of mass m on downward track)

Answer 11

mgh - 1/2mv^2