speed and acceleration ch28 Flashcards
What is the formula for calculating speed?
Speed = Distance / Time
True or False: Speed is a vector quantity.
False
Fill in the blank: Acceleration is defined as the rate of change of __________.
Velocity
What unit is commonly used to measure acceleration?
Meters per second squared (m/s²)
Which of the following is the correct formula for acceleration? (a) a = v/t, (b) a = (v_f - v_i) / t, (c) a = d/t
b) a = (v_f - v_i) / t
What does a negative acceleration indicate?
An object is slowing down.
What is the SI unit for speed?
Meters per second (m/s)
True or False: Velocity has both magnitude and direction.
True
What is the difference between average speed and instantaneous speed?
Average speed is total distance divided by total time, while instantaneous speed is the speed at a specific moment.
Fill in the blank: If an object moves in a circle at a constant speed, it is experiencing __________.
Centripetal acceleration
What is the formula for calculating distance when given speed and time?
Distance = Speed x Time
Which of the following represents uniform acceleration? (a) A car moving with constant speed, (b) A ball dropped from a height, (c) A cyclist speeding up.
b) A ball dropped from a height
What is the acceleration of an object in free fall near the Earth’s surface?
Approximately 9.81 m/s²
True or False: Speed can be negative.
False
What is the term for the maximum speed an object can achieve?
Terminal velocity
Fill in the blank: The slope of a distance-time graph represents __________.
Speed
What happens to the acceleration of an object if the net force acting on it is zero?
The acceleration is zero.
Which of the following factors can affect acceleration? (a) Mass, (b) Force, (c) Both a and b
c) Both a and b
What does the area under a speed-time graph represent?
Distance traveled
True or False: An object can have a constant speed but still be accelerating.
True
What is the term for the change in velocity over time?
Acceleration
What is the average speed of a car that travels 150 km in 2 hours?
75 km/h
Fill in the blank: The formula for calculating average acceleration is __________.
(Final velocity - Initial velocity) / Time
What does a horizontal line on a speed-time graph indicate?
Constant speed
True or False: Acceleration can occur even when an object’s speed is constant.
True
What is the acceleration if a car increases its speed from 20 m/s to 50 m/s in 10 seconds?
3 m/s²
What is the term for the speed of an object at a specific point in time?
Instantaneous speed
