Unit 5 Circular motion review

An object moving at a constant speed in a circle is accelerating because what value is changing?

• The speed

• The acceleration

• The direction

• The momentum

What causes an object to move in a curved path around the center of motion?

• The tangential velocity

• The angular velocity

• The centripetal acceleration

• The centrifugal force

An object is moving in a circle. If you double the objects velocity, what happens to the acceleration?

• It doubles

• It becomes 4 times bigger

• It become 1/4 as much

• It becomes 1/2 as much

given a=v²/r, what is the radius of an object travelling at 5m/s with an acceleration of 25m/s²?

• 125m

• 5m

• 0.2m

• 1m

Which vector shows the tangential velocity?

• The vector pointing straight out from the circle

• The vector pointing toward the blue dot

• The vector pointing straight down

• None of these vectors show tangential velocity

Which vector shows the centripetal acceleration?

• The vector pointing straight out from the circle

• The vector pointing toward the blue dot

• The vector pointing straight down

• None of these vectors show tangential velocity

Which vector shows the centripetal force?

• The vector pointing straight out from the circle

• The vector pointing toward the blue dot

• The vector pointing straight down

• None of these vectors show tangential velocity

In the picture of the single stage merry go round above, which animal has the slowest tangential velocity?

• The zebra

• The giraffe

• The horse to the inside of the giraffe

• All the objects have the same tangential velocity

In the picture of the single stage merry go round above, which animal has the longest period?

• The zebra

• The giraffe

• The horse to the left of the giraffe

• All the objects have the same period

 $v_{t_{ }}=\ \text{2pi r/T}$  What is the period of an object that has a velocity of 10m/s and a radius of 1m?

• 0.6s

• 62.8s

• 16.28s

• 3.72s