Changing Velocity

What is the main difference between speed and velocity?

• Speed includes direction, velocity does not.

• Velocity includes direction, speed does not.

• Speed is always greater than velocity.

• Velocity is always greater than speed.

Why does an object moving in a circle at constant speed have a changing velocity?

• Because its speed is increasing.

• Because it is moving in a straight line.

• Because its speed is decreasing.

• Because its direction is constantly changing.

What causes an object in circular motion to accelerate?

• An increase in mass.

• A change in direction.

• A decrease in mass.

• A change in speed.

What is the force called that keeps an object moving in a circle?

• Magnetic force

• Frictional force

• Centripetal force

• Gravitational force

If you let go of a ball attached to a string while swinging it, in which direction will it travel?

• In a straight line tangent to the circle

• In the opposite direction of the swing

• Towards the center of the circle

• In a circular path