Question

multiple select question
select all that apply
when driving a car in a straight line, in which situations do you obtain a nonzero acceleration?

when you press down farther on the gas pedal and the speedometer increases
when you hold the gas pedal fixed and the speedometer stays in place
when you release the gas pedal a little and the speedometer decreases
when you place the car on cruise control and the speedometer stays in place

Explanation:

Acceleration is non-zero when an object's speed changes (increases or decreases) over time. A constant speed means acceleration is zero.

1. Pressing the gas to increase speed: Speed changes, so acceleration is non-zero.
2. Fixed gas with constant speed: No speed change, acceleration is zero.
3. Releasing gas to decrease speed: Speed changes, so acceleration is non-zero.
4. Cruise control with constant speed: No speed change, acceleration is zero.

Answer:

• When you press down farther on the gas pedal and the speedometer increases
• When you release the gas pedal a little and the speedometer decreases