Energy

Question 1

What is impulse?

Answer 1

Impulse is a collision with an external force causing a change in momentum.

Question 2

What is the formula for kinetic energy, mass or velocity?

Answer 2

E = 1/2mv^2

Question 3

What is the formula for gravitational potential energy?

Answer 3

E = mg x change in h

Question 4

What is the formula for elastic potential energy?

Answer 4

E = 1/2kx^2 (the energy in a stretched or compressed object).

Question 5

What is Hooke’s law and the formula?

Answer 5

Hooke’s law is a principle stating that the force needed to compress or stretch a spring by some distance is proportional to that distance. F = -kx where k is the spring constant (characteristic), the - is the direction of the force and x is the extension of the spring in m.

Question 6

What is kinetic energy and gravitational potential energy?

Answer 6

kinetic energy is the energy of motion, gravitational potential energy is potential energy in an object when it is raised from the ground.

Question 7

Explain conservation of energy.

Answer 7

Energy is never created or destroyed, so the initial kinetic/potential energy = final kinetic/gravitational energy. We can use this to find either side.

Question 8

What is work and its formula/unit?

Answer 8

Work is done when a force moves something over a distance, the formula is W = Fd and it is measured in joules.