Rotating Platform Project Reflection

Project Reflection

Centripetal Velocity

Formula

Centripetal force

Multiple Choice

Why does a car accelerate as it goes around a corner at the same speed?

• Its direction changes

• It doesn't

• It slows down

• Its speeds up

Multiple Choice

A car traveling at a constant 45 mph going around a curve is accelerating because

• it is getting faster

• it is getting slower

• it is changing directions

• it is not accelerating if it has a constant speed

Multiple Choice

To make an object move in a circle at a constant speed, a net force must always be directed _________

• toward the center of the circle

• away from the center of the circle

• tangent to the circle

• opposite to gravity

Multiple Choice

The force that causes circular motion is called the

• centripetal force

• centrifugal force

• United Center Force

• pi force

Multiple Choice

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

Multiple Choice

What is the direction of the velocity at point A, if the ball is revolving clockwise?

• up
• right
• down
• left

Multiple Choice

If a body moves around a fixed point, without changing its position it is said to be ___

• Revolving

• Rotating

• Moving in a straight line
• At Rest

Multiple Choice

A body is traveling in a circle at a constant speed.

• has a constant velocity

• has no acceleration

• has an inward acceleration

• has an outward radial acceleration

Multiple Choice

The velocity is always _____ to the line of a circle. 

• outwards
• towards the center
• tangent
• faster

Multiple Select

The centripetal acceleration of an object can be calculate by (select 2 answers):

• $$\frac{v^2}{r}$$

• $$\frac{F_{cp\ }}{m}$$

• $$at^2$$

• ma

Multiple Choice

When using the term “uniform circular motion,” what do we mean by the term “uniform?”

• The direction of the object’s velocity is constant.

• The net force on the moving object is zero newtons.

• The forces acting on the object are uniformly applied from all directions.

• The motion occurs without the influence of the gravitational force

• The motion of the object is at a constant speed.

Multiple Choice

The centripetal force is best explained by which of the following statements?

• The centripetal force is the force on an object that is directed radially outward from the center of its orbit.

• The centripetal force is the force on an orbiting object that is directed along a line that is tangent to the circle.

• The centripetal force is the net force acting on an orbiting object that maintains it in uniform circular motion.

• The centripetal force is a fundamental force of nature.

Multiple Select

The equations that relate centripetal force and acceleration to velocity:

• $$F_c=\frac{mv^2}{r}$$

• $$a_c=\frac{v^2}{r}$$

• $$a_c=\frac{mv^2}{r}$$

• $$F_c=\frac{v^2}{r}$$

Multiple Choice

To calculate the speed of something moving in a circle:

• divide the circumference by the time

• multiply the circumference by the time

• divide the acceleration by the time

• multiply the mass times the acceleration

Multiple Choice

A 450 kg car travelling at 20 m/s goes around a curve with a radius of 15 m. Determine the centripetal acceleration of the car?

• 600 m/s/s

• 26.7 m/s/s

• 1.3 m/s/s

• 0.67 m/s/s

Open Ended

Mr. Malvik puts a penny (m=2.5g) on a platform that has a coefficient of friction (μ = 0.25). Calculate the maximum static friction the platform can give the penny.

Open Ended

Mr. Malvik's 2.5g penny is travels around the platform (r=7.5cm) in 1.25 seconds. How fast is the penny moving?

Open Ended

Will Mr. Malvik's penny stay on the platform? Explain by calculating the centripetal force needed to keep the penny moving in a circle. Please show your work

Open Ended

Investigate the top 3 teams' platforms. Which do you think was better and why? Give evidence based on the physics of the situation.

Open Ended

One of Mr. Malvik's goals for this project was to introduce you to new things while building your platform. Write a paragraph explaining what you individually have learned from this project.

Open Ended

Reflect on your platform's performance. Given more time, what would you have done to improve your design? Please write at least five sentences and give evidence that supports your changes (from other's designs or from physics concepts).

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