Kinematics 1 of 3 (scalars, vectors)

Which of the following statement about scalars and vectors is/are false?

• Scalar quantities are physical quantities with magnitude only.

• Scalar quantities are physical quantities with both magnitude and direction.

• Vector quantities are physical quantities with magnitude only.

• Vector quantities are physical quantities with both magnitude and direction.

Which of the following is not a scalar quantity?

• distance

• speed

• time

• velocity

What is defined as the distance covered by a moving object?

• The total length covered without considering the direction of motion and is a scalar quantity

• The total length covered taking into consideration the direction of motion and is a scalar quantity.

• The total length covered without considering the direction of motion and is a vector quantity

• The total length covered taking into consideration the direction of motion and is a vector quantity.

What is defined as the displacement covered by a moving object?

• The total length covered without considering the direction of motion and is a scalar quantity

• The total length covered taking into consideration the direction of motion and is a scalar quantity.

• The total length covered without considering the direction of motion and is a vector quantity

• The total length covered taking into consideration the direction of motion and is a vector quantity.

A car travelling 5km EAST and then makes a U-Turn to travel another 3km.

What is the distance covered AND its displacement?

• 2 km AND 8 km

• 3 km AND 5 km

• 5 km AND 3 km

• 8 km AND 2 km

Which of the following definitions about speed is correct?

• Speed is the displacement changed per unit time and is a scalar quantity.

• Speed is the distance moved per unit time and is a scalar quantity.

• Speed is the displacement changed per unit time and is a vector quantity.

• Speed is the distance moved per unit time and is a vector quantity.

Which of the following definitions about velocity is correct?

• Velocity is the displacement changed per unit time and is a scalar quantity.

• Velocity is the distance moved per unit time and is a scalar quantity.

• Velocity is the displacement changed per unit time and is a vector quantity.

• Velocity is the distance moved per unit time and is a vector quantity.

A car travels forward at a speed of 10 km/h suddenly stops and then moves in the opposite direction at a speed of 5 km/h.

What is the speed and velocity of the car as it is moving in the opposite direction? (take the forward direction as "+", and opposite direction as "-")

• 5 km/h and 5 km/h

• -5 km/h and -5 km/h

• -5 km/h and 5 km/h

• 5 km/h and -5 km/h

The average speed of a mountain deer is 15 m/s. How long does it take to run 300 m?

• (15/300) s

• (15 x 300) s

• (300 / 15) s

• (15 + 300) s

The speed of an object at a particular moment is known as its

• average speed

• total speed

• instantaneous speed

• top speed