Understanding Motion in a Straight Line

What is acceleration?

• Acceleration is the distance traveled over time.

• Acceleration is the force applied to an object.

• Acceleration is the rate of change of velocity over time.

• Acceleration is the speed of an object at a given moment.

Define deceleration.

• Deceleration is the increase of speed or velocity.

• Deceleration is the reduction of speed or velocity.

• Deceleration refers to the maintenance of constant speed.

• Deceleration is the process of accelerating in the opposite direction.

How is acceleration calculated?

• a = v_f / v_i

• a = v_f + v_i * t

• a = (v_i - v_f) * t

• a = (v_f - v_i) / t

What is the unit of acceleration?

• meters per second square (m/s²)

• meters per second (m/s)

• kilometers per hour (km/h)

• grams per second squared (g/s²)

Explain the difference between positive and negative acceleration.

• Positive acceleration refers to a decrease in speed; negative acceleration refers to an increase in speed.

• Positive acceleration increases velocity; negative acceleration decreases velocity.

• Positive acceleration decreases velocity; negative acceleration increases velocity.

• Both positive and negative acceleration increase velocity.

What does a negative acceleration indicate?

• Negative acceleration signifies a constant speed without any change.

• Negative acceleration means the object is moving faster in the same direction.

• Negative acceleration indicates an increase in speed.

• Negative acceleration indicates deceleration or a decrease in speed.

If a car speeds up from 20 m/s to 50 m/s in 5 seconds, what is its acceleration?

• 10 m/s²

• 8 m/s²

• 6 m/s²

• 4 m/s²

What is the formula for calculating average acceleration?

• average acceleration = v_f / t

• average acceleration = (v_f - v_i) / t

• average acceleration = v_f + v_i

• average acceleration = (v_i + v_f) * t

Describe a scenario where an object experiences deceleration.

• A car slowing down as it approaches a red light.

• A car speeding up on a highway.

• A ball rolling down a hill.

• A bicycle maintaining a constant speed.

How does friction affect acceleration?

• Friction increases acceleration by enhancing the motion of an object.

• Friction decreases acceleration by opposing the motion of an object.

• Friction has no effect on acceleration whatsoever.

• Friction only affects the speed of an object, not its acceleration.