Physics Kinematics: Motion in a Straight Line - Acceleration

This video tutorial covers kinematics, focusing on motion in a straight line and acceleration. It explains velocity as a vector quantity and introduces acceleration as the rate of change in velocity. Through examples, it demonstrates how objects can move without accelerating and how to calculate average acceleration. The tutorial also discusses uniform and non-uniform acceleration, the distinction between scalars and vectors, and provides a sample question to reinforce learning.

What is the primary difference between velocity and speed?

• Speed is measured in meters per second squared.

• Velocity is a scalar, while speed is a vector.

• Speed includes direction, while velocity does not.

• Velocity includes direction, while speed does not.

Which of the following is true about acceleration?

• It has no direction.

• It is the rate of change of velocity.

• It is a scalar quantity.

• It is the rate of change of speed.

If an object is moving at a constant speed in a straight line, what is its acceleration?

• Zero

• Negative

• Variable

• Positive

What happens to an object when it reaches terminal velocity?

• Its acceleration becomes zero.

• It stops moving.

• It moves upwards.

• It continues to accelerate.

How do you calculate average acceleration?

• By multiplying the final velocity by the initial velocity.

• By dividing the change in velocity by the time taken.

• By adding the initial and final velocities.

• By dividing the change in speed by the time taken.

What is the significance of sign conventions in physics?

• They are only used in non-uniform acceleration.

• They determine the magnitude of vectors.

• They help in identifying the direction of vectors.

• They are used to calculate scalar quantities.

Which of the following is an example of uniform acceleration?

• A car speeding up and slowing down.

• A ball rolling down a hill with increasing speed.

• A cyclist turning a corner at constant speed.

• A skydiver falling at a constant rate.

What is the relationship between acceleration and net force?

• Acceleration occurs in the same direction as the net force.

• Acceleration is independent of the net force.

• Acceleration occurs in the opposite direction of the net force.

• Acceleration is always zero when net force is applied.

In the sample question, what is the average acceleration of the ball?

• 70 meters per second squared upwards

• 70 meters per second squared downwards

• 7 meters per second squared upwards

• 7 meters per second squared downwards

What must be ensured when calculating acceleration?

• Initial and final velocities must have different units.

• Initial and final velocities must have the same units and direction.

• Only the final velocity needs to be considered.

• Only the initial velocity needs to be considered.