7th review Singleterry

Front

Which is true about speed and velocity?

Back

Speed is like velocity but without a direction

Answer explanation

The correct choice states that speed is like velocity but without a direction. Speed is a scalar quantity, representing how fast an object moves, while velocity is a vector that includes both speed and direction.

Front

What is a difference between distance and displacement?

Back

Displacement can be zero if the object ends up where it started.

Answer explanation

Displacement measures the shortest path from the initial to the final position, and can be zero if the start and end points are the same. Distance, however, is the total path traveled and is always positive.

Front

An astronaut travels at a speed of 400 m/s for 250 seconds. What is the total distance covered?

Back

100,000 m

Answer explanation

To find the distance traveled, use the formula: distance = speed × time. Here, distance = 400 m/s × 250 s = 100,000 m. Thus, the correct answer is 100,000 m.

Front

A horse follows a hanging carrot for 20 m, if it took 50 seconds to reach it, what was its average speed?

Back

0.4 m/s

Answer explanation

Average velocity is calculated as total distance divided by total time. Here, the horse traveled 20 m in 50 s. Thus, average velocity = 20 m / 50 s = 0.4 m/s, which is the correct answer.

Front

How many seconds does it take to travel 800 cm at a speed of 25 cm/s?

Back

32 s

Answer explanation

To find the time taken, use the formula: time = distance / speed. Here, time = 800 cm / 25 cm/s = 32 s. Thus, the correct answer is 32 s.

Front

A frog jumps 50 cm for 5 seconds, then jumps 60 cm every 2 seconds. What is its average speed?

Back

15.7 cm/s

Answer explanation

The frog hops 50 cm in 5 seconds, giving a speed of 10 cm/s. Then, it hops 60 cm in 2 seconds, which is 30 cm/s. The total distance is 110 cm in 7 seconds, resulting in an average speed of 15.7 cm/s.

Front

If it takes 45 s to travel 50 m, what was your average speed during the trip?

Back

1.1 m/s

Answer explanation

Average speed is calculated as total distance divided by total time. Here, 50 m / 45 s = 1.1 m/s. Thus, the correct answer is 1.1 m/s.

Front

What is true about this graph?

Back

The displacement of the object is 0 m

Answer explanation

The displacement is the shortest distance from the initial to the final position. If the object returns to its starting point, the displacement is 0 m, even if the distance traveled is greater.

Front

Which of the following has INCORRECT units? velocity = m/s, time = s, displacement = m, velocity = s

Back

velocity = s

Answer explanation

The correct choice is 'velocity = s'. Velocity is a vector quantity that should have units of meters per second (m/s), not seconds (s). The other options have correct units.

Front

What is a vector?

Back

Displacement

Answer explanation

Displacement is a vector quantity as it has both magnitude and direction, representing the shortest path from one point to another. In contrast, distance and speed are scalar quantities, lacking direction.