Uniform Circular Motion, Gravitation, Charged Particles

In the hammer throw event, which of the following correctly indicates the path the hammer will take when it is released?

• The hammer will take a straight-line path tangent to the circle it was inscribing prior to its release.

• The hammer will continue to curve, with the circle getting larger each revolution.

• The hammer will take a straight-line path directly away from the center of the circle it was inscribing prior to its release.

• The hammer will take a straight-line path directly toward the center of the circle it was inscribing prior to its release.

For a body in uniform circular motion, what is the direction of the acceleration vector?

• The acceleration vector is directly toward the center of the circle it was inscribing.

• The acceleration vector is directly away from the center of the circle it was inscribing.

• The acceleration vector is a straight-line tangent to the circle it was inscribing.

• The acceleration vector is downward toward the center of the Earth (gravity.)

For a body in uniform circular motion, what is the direction of the velocity vector?

• The velocity vector is always tangent to the circle an object is inscribing.

• The velocity vector is always a straight-line directly toward the center of the circle an object is inscribing.

• The velocity vector is always a straight-line directly away from the center of the circle an object is inscribing.

• The velocity vector is always downward because of the force of gravity.

If a student is swinging a bucket in a horizontal circle, in which direction is the centripetal force on the bucket?

• directly inward toward the student's hand

• directly outward away from the student's hand

• in a straight line tangent to the circle the bucket is inscribing

• directly downward

Tags

NGSS.HS-PS2-1

Velocity, acceleration, and force are examples of ______________ quantities.

• vector

• scalar

• tangent

• Newtonian

Tags

NGSS.HS-PS2-1

An object traveling a circular path of radius 5 m at constant speed experiences an acceleration of 3 m/s². If the radius of its path is increased to 10 m, but its speed remains the same, what is its acceleration?

HINT: a = v² / r

• 0.3 m/s²

• 1.5 m/s²

• 6 m/s²

• 12 m/s²

A Lincoln Continental and a Yugo are making a turn. The Lincoln is four times more massive than the Yugo. If they make the turn at the same speed, then how do the centripetal forces acting upon the two cars compare?

HINT: F_net=(m•v²) / R, meaning force and mass are directly proportional.

• The centripetal force on the Continental is four times greater than that of a Yugo, so four times the mass means four times the force.

• Since the centripetal force on the Continental is four times greater than that on the Yugo, the force will be one-fourth on the Yugo.

• Since the centripetal force on the Continental is four times greater than that on the Yugo, the force will be 16x on the Yugo.

• None of these answers are correct!

The acceleration experienced by an object when the only force acting upon it is the force of gravity is represented by which of the following?

• g

• F_grav

• mgh

• Gm₁m₂/d

The value for the acceleration of gravity is approximately 9.8 m/s². It is the same acceleration value for all objects, regardless of their mass.

• True

• False

Which of the following statements are true concerning gravity? CHOOSE ALL THAT APPLY!

• Gravity is proportional to the product of the masses.

• Gravity is inversely proportional to the square of the distance.

• The effect of gravity upon masses increases as distance increases.

• Albert Einstein was the first to attempt to explain both the behavior of everyday objects on Earth’s surface as well as the motions of the planets through space.

Tags

NGSS.HS-PS2-4