Last Ever Physics 1 Quizziz

hree blocks are pushed along a rough surface by a force with magnitude P, as shown above. FC is the magnitude of the contact force between blocks 2 and 3, and Ff , FN , and FG are the magnitudes of the friction, normal, and gravitational forces on block 3, respectively. Which of the following is a correct free-body diagram for block 3 ?

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Tags

NGSS.HS-PS2-1

A wheel with radius 0.33 m and rotational inertia 2.0 kgm^2 spins on an axle with an initial angular speed of 3.0 rad s. Friction in the axle exerts a torque on the wheel, causing the wheel to stop after 6.0 s. The average torque exerted on the wheel as it slows down has magnitude

• 0.50 Nm

• 1.0 Nm

• 2.0 Nm

• 3.0 Nm

Tags

NGSS.HS-PS3-2

Sphere 1 of mass m and sphere 2 of mass 2m hang from light strings. Sphere 1 is pulled back, as shown above, and released from rest. Sphere 1 has kinetic energy K immediately before colliding with sphere 2. The two spheres stick together and move horizontally for an instant after the collision. During the collision, what is the change in the kinetic energy of the two-sphere system?

• 0

• -K/3

• -K/2

• -2K/3

Tags

NGSS.HS-PS2-2

The graph represents the position of two identical carts on a straight horizontal track as a function of time. Which of the following statements about the magnitude of the momentum of the two-cart system’s center of mass, p, is true?

• p is constant from t = 0 s to t = 5 s

• p is smaller after t = 2 s than it is before t = 2 s

• p is larger after t = 2 s than it is before t = 2 s

• p increases at a constant rate from t = 0 s to t = 5 s

Tags

NGSS.HS-PS2-2

At time t = 0, a projectile is launched from the top of a cliff at an angle of 30 degrees below the horizontal. Which of the following pairs of graphs best represents the horizontal displacement and the vertical velocity component of the projectile as a function of time t ?

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Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

An object hangs in equilibrium from a spring, as shown above. The object is then displaced to one of the labeled points X, Y, or Z . Which of the following correctly ranks the elastic potential energy U stored in the spring when the object is at each of the three positions?

• $U_x>\left(U_y=U_z\right)$

• $U_y>\left(U_x=U_z\right)$

• $U_y>U_x>U_z$

• $U_y>U_z>U_x$

A simple pendulum consists of a sphere tied to the end of a string of negligible mass. The sphere is pulled back until the string is horizontal and then released from rest. Assume gravitational potential energy is zero when the sphere is at its lowest point. What angle will the string make with the horizontal when the kinetic energy and the potential energy of the sphere-Earth system are equal?

• Greater than 45 degrees

• Equal to 45 degrees

• Less than 45 degrees

• It cannot be determined without knowing the mass of the sphere.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

An amusement park ride consists of a large vertical wheel of radius R that rotates counterclockwise on a horizontal axis through its center, as shown above. Which of the following best describes a passenger’s linear and angular velocity while passing point A?

• Linear velocity - constant

  angular velocity - changing

• Linear velocity - constant

  angular velocity - constant

• Linear velocity - changing

  angular velocity - constant

• Linear velocity - changing

  angular velocity - changing

Tags

NGSS.HS-PS2-1

An amusement park ride consists of a large vertical wheel of radius R that rotates counterclockwise on a horizontal axis through its center, as shown above. Points A and D represent the position of a car at the highest and lowest point of the ride, respectively. While passing point A, the person releases a small rock of mass m, which falls to the ground without hitting anything. At point A, the car is moving at speed v. What is the kinetic energy when the rock passes point D?

• $\frac{1}{2}mv^2$

• $mgR$

• $2mgR$

• $\frac{1}{2}mv^2+2mgR$

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1