10- work, energy and power

Question 1

what is the equation for work done when the displacement is not in the direction of the force

Answer 1

w= Fcos θ x s

Question 2

what is the area under the graph in a force displacement graph

Answer 2

work done

Question 3

what is kinetic energy

Answer 3

the energy an object has due to its motion

Question 4

what is potential energy

Answer 4

the energy an object has due to its state, position or shape

Question 5

what is the final formula for the velocity of a falling object derived from Ek and Ep

Answer 5

v = √2gh

Question 6

what is the formula of a falling object experiencing a frictional force derived from Ek and Ep

Answer 6

1/2 mv^2 = mg △h - f △h

Question 7

what is power

Answer 7

work done per unit time

Question 8

what is the equation for power of a moving object

Answer 8

p = Fv

Question 9

what is efficiency

Answer 9

a ratio of useful energy transferred to the total energy input

Question 10

what is the efficiency equation

Answer 10

efficiency = useful energy transferred / total energy input