QUIZ 6&7 SET 3

An object moving with constant speed in a circular path has acceleration because ________.

• its direction is always changing.

• its direction is constant.

• its direction is zero.

• its direction is increase.

The acceleration of a body in circular motion is always ________.

• to the left of the circle.

• towards to the center of circle.

• out of the circle.

• downward of the circle.

The example of centripetal force are ___________.

A. the Earth's gravitational force on the satellite.

B. as a car makes a turn.

C. an object tied to a string swings to make a circle.

D. a worker is pushing a wheelbarrow along a path.

• A, B & D

• B, C & D

• A, B & C

• A, C & D

Which of the following is NOT a unit of rotational speed?

• Revolutions per second

• Revolutions per minute

• Meters per second

• Rotations per second

Which of these quantities is not described by the kinematics of rotational motion?

• Rotation angle

• Angular acceleration

• Angular velocity

• Centripetal force

What is meant by angular velocity?

• rate of change in angular displacement

• tangential velocity over time

• angle swept by radius in a particular direction

• rate of change in angular displacement

Positive torque when the force tends to produce a ______________________ rotation about the axis.

• clockwise

• anticlockwise

• circular

• direction of

Torque NOT depends on the _____________.

• magnitude of force applied.

• length of the lever arm.

• mass of the rigid body.

• angle between the force and the lever arm.

The easiest way to open a heavy door is by applying the force is _______________.

• near the hinges

• in the middle of the door

• at the top of the door

• at the edge of the door far from the hinges

Fizik best !

• Yes

• No

• Don't know

• Maybe