Understanding Speed and Velocity

What is the definition of speed?

• The rate at which an object changes its position.

• The distance traveled per unit of time.

• The rate of change of velocity.

• The direction of motion of an object.

What is the definition of velocity?

• The distance traveled per unit of time.

• The rate at which an object changes its position.

• The speed of an object in a given direction.

• The total distance covered by an object.

Which of the following best describes the difference between speed and velocity?

• Speed is a vector quantity, while velocity is a scalar quantity.

• Speed includes direction, while velocity does not.

• Speed is a scalar quantity, while velocity is a vector quantity.

• Speed and velocity are the same.

If a car travels 150 kilometers in 3 hours, what is its average speed?

• 30 km/h

• 50 km/h

• 60 km/h

• 70 km/h

If a car travels 150 kilometers north in 3 hours, what is its average velocity?

• 30 km/h north

• 50 km/h north

• 60 km/h north

• 70 km/h north

Which of the following is a vector quantity?

• Speed

• Distance

• Velocity

• Time

Which of the following is a scalar quantity?

• Displacement

• Velocity

• Speed

• Acceleration

If an object moves in a circle at constant speed, what can be said about its velocity?

• The velocity is constant.

• The velocity is zero.

• The velocity changes due to the change in direction.

• The velocity is equal to the speed.

Identify the following quantities as velocity or speed quantities.

Groups:

(a) Velocity

,

(b) Speed

• 50 mi/hr northeast

• 30 km/hr

• 2 m/s

• 25 km/hr

• 20 ft/sec south

• 15 km/hr southwest

• 30 mi/hr southeast

• 60 mi/hr

• 5 ft/sec down

• 10 mi/hr northwest

• 45 km/hr

• 25 m/s east

• 12 ft/sec west

• 15 m/s

• 20 mi/hr

• 50 ft/sec

Which controls of a vehicle could change its velocity?

• Steering wheel

• Gas pedal

• Brake pedal

• Blinker