P9 - Motion

Question 1

What is a scalar quantity?

Answer 1

Does not involve direction

Question 2

What is the velocity of an object?

Answer 2

Speed in a given direction

Question 3

What the speeds of walking, running, cycling, speed of sound in air?

Answer 3

• Walking (1.5 m/s)
• Running (3 m/s)
• Cycling (6 m/s)
• Speed of sound in air (330 m/s)

Question 4

What does a distance time graph represent?

Answer 4

Represents the distance travelled by an object moving along a straight line.

Question 5

How is the speed of an object calculated in a distance-time graph?

Answer 5

The gradient of the line

Question 6

How is acceleration calculated?

Answer 6

Change in velocity over the time taken(gradient)

Question 7

What is the value for the gravity of the Earth’s surface?

Answer 7

9.8m/s^2

Question 8

What happens to an object as it falls through a fluid such as air or water?(3)

Answer 8

• Object initially accelerates due to the force of gravity
• As it increases in speed resistance acting in the opposite direction increases
• Eventually the force due to gravity and force due to resistance are equal and object reaches terminal velocity

Question 9

What is displacement?

Answer 9

The distance travelled in a given direction

Question 10

What is deceleration?

Answer 10

Negative acceleration when an object slows down

Question 11

Compare velocity and speed

Answer 11

• Both speed and velocity can be calculated by diving the distance an object travelled by the time that it took. - Velocity and speed also have the same unit which is m/s. However velocity is a vector and has direction, while speed is a scalar and does not have direction