Forces Study Guide

What is the gravitational force exerted on an object called?

• centripetal force

• friction

• momentum

• weight

Which of the following best describes why projectiles move in a curved path?

• They have horizontal velocity and vertical acceleration.

• They have momentum.

• They have mass.

• They have weight.

Which of the following explains why astronauts seem weightless in orbit?

• Earth's gravity is much less in orbit.

• The space shuttle is in free fall.

• The gravity of Earth and the Sun cancel.

• The centripetal force on the shuttle balances Earth's gravity.

Which of the following exerts the strongest gravitational force on you?

• the Moon

• Earth

• the Sun

• this computer

Which of the following is true about an object in free fall

• Its acceleration depends on its mass.

• it has no inertia.

• It pulls on Earth, and Earth pulls on it.

• Its momentum is constant.

The acceleration of an object is in the same direction as which of the following?

• net force

• static friction

• air resistance

• gravity

Which of the following is NOT a force?

• weight

• friction

• momentum

• air resistance

The graph show the speed of a car moving in a straight line. Over which segments are the forces on the car balanced?

• A and C

• B and D

• C and E

• D only

The net force on an object moving with constant speed in circular motion is in which direction?

• downward

• opposite to the object's motion

• toward the center of the circle

• in the direction of the object's velocity

According to the trend in these data, which of the following values is most likely the speed of the object after falling for 6s?

• 26.7 m/s

• 15.1 m/s

• 20.3 m/s

• 0 m/s