Question 2 b)

What

is the change in the ball’s position from

Question 1 d)

Which statement below is true?

Question 2 a)

A

ball rolls horizontally along a track. A camera takes a picture of the ball 4

times every second and the position of the ball at each photograph is shown in

the diagram below (note the leftmost ball position is the first photograph,

with each subsequent photograph showing the movement of the ball towards the

right of the track).

Which

of the graphs of position,

Question 1 c)

What

was the initial speed of the second stone?

Give your answer to 1 decimal place

in units of m/s. Write your answer without units i.e., 12.6 m/s as 12.6.

Question 1 b)

What is the speed of the first stone when it hit

the water?

Question 1 a)

A tourist is standing on a rock ledge hanging over a pool 65

metres below them.

They throw one stone vertically downwards, wait 1.5 s and

then throw a second stone vertically downwards. They see a single splash (both

stones hit the water at the same time). The initial speed of the first stone

was 2.2 m/s.

How much time has elapsed between the release of

the first stone and the second stone hitting the water? Give your answer to 1

decimal place in seconds. Write your answer without units i.e., 12.6 s as 12.6.

You

work for a company that tests machine components that undergo high-speed

rotation. One component consists of a solid steel disk of mass 350 kg and

radius, 45 cm spinning at an angular speed of 18,000 rev/min.

What

is the angular speed of the disk in rad/s?

Give

your answer to 0 decimal places in rad/s. Do not include the units in your

answer i.e. you would write 2 rad/s as 2

You

work for a company that tests machine components that undergo high-speed

rotation. One component consists of a solid steel disk of mass 350 kg and

radius 45 cm spinning at an angular speed of 18,000 rev/min.

Calculate

the moment of inertia assuming a solid disk.

Give

your answer to 2 decimal places in kgm

When a child starts a merry-go-round from rest is the angular velocity constant?

Now let's say that our driver is not speeding (so is going 80kmh = 22 m/s) but they are looking at their cell phone. Their alarmed passenger shouts "ROOOOOOOO!!!!." In this case, it takes them 2.5 seconds to react and start applying the brakes.

What's your gut reaction: do they hit the kangaroo?