Describing motion

Question 1

Difference between Scalar and Vector qualities

Answer 1

Scalar has magnitude but no direction (e.g speed, distance) whereas vector has direction and magnitude (e.g displacement, acceleration)

Question 2

What is the average walking speed of a human

Answer 2

1.5 m/s

Question 3

What is the average running speed of a human

Answer 3

3 m/s

Question 4

What is the equation for speed

Answer 4

Speed (m/s) = distance (m)/time (s)

Question 5

What is the equation for acceleration

Answer 5

Acceleration (m/s2) = change in velocity (m/s)/time (s)

Question 6

What is the equation for uniform acceleration

Answer 6

Final Velocity (m/s2)- Initial Velocity (m/s2) = 2x Acceleration (m/s2) x distance (m)

Question 7

Describe how a falling object reaches it’s terminal velocity.

Answer 7

As the object is dropped, it initially accelerates due to it’s weight. Then, as the objects vertical speed increases, the drag force due to air resistance increases. This continues until the drag force is equal to the weight and the forces are balanced. There is no more acceleration and the object is moving uniformly at it’s maximum speed. This speed is called the terminal velocity