M whatever we learnt first

Question 1

Explain why a person sitting in a car on a roller coaster would feel heavier at the top compared to the bottom
3.

Answer 1

How heavy a person feels depends on the Fr size

At the top Fc is provided by Fg so Fr is relatively small

At the bottom Fr must not only oppose Fg, it must provide the entirety of Fc, so Fr is large.

Question 2

Where does this formula apply Fc= mv*2/r

2.

Answer 2

Objects moving in circular path, constant speed.

It’s the force required to keep an object moving in a circle e.g centripetal force.

Question 3

Where it’s used? Fg= Gm-1m-2/r*2
(gm-1= g x mass 1
m2= mass 2 not mass x 2)

Answer 3

The Fg between 2 objects, calculates attraction between them based on their masses and the distance. e.g earth or moon.

Question 4

energy taken place when an object rolls down a ramp

Answer 4

Gravitational potential energy to linear and rotational kinetic energy

Question 5

Calc Rotational inertia steps

Answer 5

1. Eg= mgh
2. v=wr or w=v/r
3. Eg=1/2mv2 + 1/2Iw2
   or I= 2Eg-mv2/w2
   w= omega

Question 6

Whats needed for an object to move in a circular path

Answer 6

An unbalanced force to continually change it’s direction

Question 7

Rotational motion?

Answer 7

The motion of an object around a circular path in a fixed orbit’

Question 8

If a car is travelling horizontally?

Answer 8

There will be no vertical components acting unbalanced

Question 9

whats one thing gravitational attraction affects

Answer 9

The velocity of orbits

Question 10

How can you tell if the assumption of constant velocity before a collision is valid?

Answer 10

Small acceleration= A valid assumption (gravitational attraction isn’t strong enough to change the velocity)

Large acceleration= (Gravitational attraction is strong enough to cause noticeable change in velocity)

Question 11

Momentum is conserved because..?

Answer 11

no external forces acting on the system, total momentum before collision = total momentum after collision