The gravitational pull of the sun on Earth keeps Earth orbiting around the sun. Which statement is correct about the force that Earth exerts on the sun?(1 point) 1.Earth pulls the sun away from itself with a force equal to the ratio of the mass of the sun to the mass of Earth.

2.Earth pulls the sun away from itself with an equal force.

3.Earth pulls the sun toward itself with an equal force.

4.Earth pulls the sun toward itself with a force equal to the ratio of the mass of the sun to the mass of Earth.

A paper pinwheel is spinning in the wind. Which statement is correct about the forces responsible for the rotation? (1 point)

1.Only the perpendicular component of gravity is responsible for the rotation, because wind points toward the pivot.

2.Only the perpendicular component of wind is responsible for the rotation, because gravity points downward.

3.The components of gravity and the force of wind that point through the pivot are responsible for the rotation.

4.The perpendicular components of gravity and the force of wind are responsible for the rotation.

Which statement about kinetic and static friction is accurate?(1 point)

1.Static friction is greater than kinetic friction, but they both act opposite the applied force.

2.Static friction is greater than kinetic friction, and they both act in conjunction with the applied force.

3.Kinetic friction is greater than static friction, and they both act in conjunction with the applied force.

4.Kinetic friction is greater than static friction, but they both act opposite the applied force.

A group of engineers is preparing a satellite to land by moving it 10% closer to Earth in each rotation. Which statement is correct about the rotational inertia of the satellite? (1 point)

1.Rotational inertia does not change because it is conserved.

2.Rotational inertia decreases proportional to the decrease in the radius of rotation.

3.Rotational inertia increases proportional to the decrease in the radius of rotation.

4.Rotational inertia first decreases and then increases as the satellite is ready to land.

In the experimental setup shown, a car has one end of a string attached to it, and the other end is attached to a fixed number of metal discs. The car moves along the table and two photogate probes sense the motion of the car. The probes send information to a computer that displays the acceleration and velocity of the experiment. When looking at these results, which quantity varies during the trials?

A car at the one end of the table is tied to a hanger at the other end of the table using a string. The hanger can support the metal discs. A ruler, a laptop, and other equipment are also placed on the table.

(1 point)

acceleration

velocity

force

mass

Force and Motion Unit Test
6 of 20 Items

Students in a science class conducted an investigation to demonstrate that, by Newton’s second law of motion, the ratio between the net force and the acceleration produced is constant. They manipulated the net force applied to an object and measured the acceleration that the object acquired in response. The results are shown in the table.

Net force (N) Acceleration (m/s2)
2.4 9.6
1.4 5.6
3.2 12.8
The students want to present their results in a graph. How should they organize the graph to show the data they collected?

(1 point)

use the x-axis for the force and the y-axis for the ratio between the force and the acceleration

use the x-axis for the force and the y-axis for the acceleration

use the y-axis for the force and the x-axis for the ratio between the force and the acceleration

use the y-axis for the force and the x-axis for the acceleration

Two rockets with the same mass are accelerated. Rocket A accelerates twice as quickly as rocket B. Which statement is correct?(1 point)

The motor in rocket A is half as powerful as the motor in rocket B.

The motor in rocket A is half as powerful as the motor in rocket B.

The motor in rocket A is four times as powerful as the motor in rocket B.

The motor in rocket A is twice as powerful as the motor in rocket B.