11.1 Linear Motion

Question 1

What is a scalar quantity?

Answer 1

• Quantities that just have size

Question 2

What is a vector quantity?

Answer 2

• Quantities that just have size and direction

Question 3

What is mass?

Answer 3

The quality/amount of matter the body possesses

Mass is a scalar quanitity because it does not have direction, just size

Question 4

What is weight?

Answer 4

• The force on a given mass due to gravity

measured in Newtons

Question 5

What is the calculation for weight?

Answer 5

Mass X Gravity= Weight

Question 6

What is distance?

Answer 6

• Measured in meters & is the path a body takes as it moves from the starting to the finish position

Distance & displacement are used to describe the extent of a bodys motion

Question 7

What is displacement?

Answer 7

Measured in meters & is the shortest route in a straight line between the starting & finishing position

Question 8

What is speed?

Answer 8

• How fast the body moves
  (With no reference to direction)

Question 9

What is the formula for speed?

Answer 9

Distance/Time

Question 10

What is velocity?

Answer 10

• Refers to how fast a body travels in a certain direction

Question 11

What is the formula for velocity?

Answer 11

Displacement/ Time taken

Question 12

What is acceleration?

Answer 12

• The rate of change of velocity
• When velocity increases positive acceleration occurs
• When velocity decreases, negative acceleration takes place

Question 13

How do you calculate acceleration?

Answer 13

Change in velocity/ Time

Question 14

How do you calculate the final change in velocity?

Answer 14

Final velocity- Initial velocity/Time

Question 15

What is momentum?

Answer 15

• The product of the mass and velocity of an object

Question 16

How do you calculate momentum?

Answer 16

Mass x Velocity

Question 17

What is weight?

Answer 17

• The gravitational force exerted on an object.

Weight= mass x acceleration due to gravity & is measured in newtons (N)

Question 18

What is reaction force?

Answer 18

• Occurs when two bodies are in contact with one another

Question 19

What are the two types of frictional force?

Answer 19

• Static: The force exerted on one surface by another when there is no motion between the two surfaces e.g. the surface of the netball court & the sole of a shoe
• Sliding: When there are two bodies in contact with one another that may have a tendancy to slip/slide over each other
  -Friction acts in opposition to motion.