Deck 10: Chapter 9 Equations

Question 1

acceleration =

Answer 1

change in velocity/ time

Question 2

average velocity=

Answer 2

initial velocity+ final velocity / 2

Question 3

State all the suvat equations.

Answer 3

1) v=u+at2)v^2 = u^2 + 2as3) d= ut + 1/2at^24) s= 1/2(u+v)t

Question 4

State the equation for newtons second law.

Answer 4

F=ma

Question 5

In braking a car, what is thinking distance proportional to?

Answer 5

Thinking distance is proportional to speed.

Question 6

In braking a car, what is the braking distance proportional to?

Answer 6

Braking distance is proportional to V^2

Question 7

How can velocity be calculated?

Answer 7

V= at

Question 8

What is momentum?

Answer 8

Force x time and also mass x velocity

Question 9

What does momentum tell you?

Answer 9

Momentum mv says how big a force is needed to stop in a given distance.

Question 10

What is kinetic energy?

Answer 10

Force x displacement or 1/2mv^2

Question 11

What does kinetic energy tell you?

Answer 11

Kinetic energy 1/2mv^2 says how big a force is need to stop in a given distance.

Question 12

What equation calculates the gravitational potential energy of an object?

Answer 12

potential energy = mgh

Question 13

What happens when a ball is dropped?

Answer 13

The gravitational potential energy decreases while the kinetic energy increases.

Question 14

Power is?

Answer 14

Power=rate of transfer of energy = force x velocity

Question 15

Work done

Answer 15

drag force x displacement

Question 16

work done per second =

Answer 16

drag force x distance moved per second.