1st Semester Exam (force, motion, energy, waves)

Front

Velocity includes the speed that the object is moving and a

Back

direction

Answer explanation

Velocity is defined as speed with a direction. Unlike speed, which is a scalar quantity, velocity is a vector quantity that includes both magnitude (speed) and direction. Therefore, the correct answer is 'direction'.

Front

Complete the formula: speed = __/time

Back

distance

Answer explanation

The formula for speed is derived from the relationship between distance, speed, and time. Speed equals distance divided by time, making 'distance' the correct choice to complete the formula.

Front

If a person runs 100 meters in 10 seconds, what is their average speed?

Back

10 m/s

Answer explanation

To find average speed, divide distance by time. Here, 100 meters in 10 seconds gives an average speed of 100 m / 10 s = 10 m/s. Thus, the correct answer is 10 m/s.

Front

What is the speed of a plane with a velocity of 500 miles per hour west?

Back

500 miles per hour

Answer explanation

The speed of the plane is the magnitude of its velocity. Since velocity includes direction, the speed is simply 500 miles per hour, regardless of the westward direction.

Front

If a car travels 18,000 meters in 30 minutes, what is its average speed?

Back

600 m/min

Answer explanation

To find the average speed, divide the distance by time. Here, 18,000 meters in 30 minutes equals 18,000 / 30 = 600 m/min. Thus, the correct answer is 600 m/min.

Front

Acceleration is the rate of change of an object's:

Back

velocity

Answer explanation

Acceleration is defined as the rate of change of velocity, which measures how quickly an object's speed and direction change over time. Therefore, the correct answer is velocity.

Front

What is the SI unit for finding speed?

Back

m/s

Answer explanation

The SI unit for speed is meters per second (m/s), which measures the distance traveled in meters for each second of time. The other options do not represent speed: m/s squared is for acceleration, m is for distance, and s is for time.

Front

The process of changing position is called:

Back

motion

Answer explanation

The process of changing position is known as motion. It refers to the movement of an object from one place to another, distinguishing it from terms like displacement, which measures the change in position.

Front

The measure of the distance an object travels per unit of time is called:

Back

speed

Answer explanation

The measure of the distance an object travels per unit of time is defined as speed. Unlike velocity, which includes direction, speed only considers how fast an object is moving.

Front

What is the SI unit for measuring distance?

Back

meters

Answer explanation

The SI unit for measuring distance is the meter. While kilometers, miles, and seconds are related to distance, only meters is the standard unit defined by the International System of Units (SI).