linear motion

Question 1

what are the 3 scalar quantities

Answer 1

• mass
• speed
• distance

Question 2

what are the four vector quantities

Answer 2

• weight
• velocity
• displacement
• momentum

Question 3

what is mass

Answer 3

• mass is a physical quantity expressing the amount of matter or substance in a body.
  the mass of an object will never change (e.g. weight of a shot will have the same mass on earth and the moon)

Question 4

what are scalars

Answer 4

quantities that just have size/magnitude

Question 5

what are vectors

Answer 5

quantities size/magnitude and direction

Question 6

what is weight

Answer 6

• the force acting on a given mass due to gravity
  it is measure in newtons
• weight = mass x gravity
• weight will change depending on gravity

Question 7

what is distance

Answer 7

• measured in meters and is the path a body takes as it moves from the starting position to the finishing position.

Question 8

what is displacement

Answer 8

• the shortest route in a straight line between the start and the finish point. ( in meters)

Question 9

what is speed

Answer 9

• a measurement in meters/second of the body movement per unit of time with no reference to direction.

Question 10

what is velocity

Answer 10

• Is when measurements are described, in terms of magnitude and direction – weight, acceleration, displacement, velocity and momentum.
• = displacement/time.
• Measured in meters/ second and is the rate of change of displacement

Question 11

what is acceleration

Answer 11

• Acceleration is the rate of change of velocity.
• Final velocity – initial velocity/ time = acceleration
• When velocity increases positive acceleration occurs, and when velocity decreases negative acceleration takes place.

Question 12

what is momentum

Answer 12

• Momentum is the product of mass and velocity of an object.
• Momentum = mass x velocity.
• Momentum is calculated using velocity. It has magnitude and direction and is therefore also a vector quantity. Momentum is dependent upon mass and velocity if one of these increases them momentum increases.

Question 13

what is an impulse

Answer 13

• Impulse = force x time
• Impulse is measured in newtons per second.
• Increased impulse will cause an increased change in momentum. This causes a large change in velocity.
• Example would be following though during a tee shot in golf.
• Example would be a drag flick in hockey.
• Example would be a javelin throw.
• ## A long-distance kicks in rugby for the posts.