motion

Question 1

distance

Answer 1

is the total length that an object travels.

Question 2

displacement

Answer 2

is the change in position of an object in a straight line from the starting point to the finishing point.

Question 3

speed

Answer 3

speed is how quickly an object travels. the formula is distance travelled/ time taken.

Question 4

velocity

Answer 4

velocity is also a measure of how fast something is travelling, however it requires direction. It measures the change in displacement of an object after a period of time (m/s or km/h). average velocity = displacement/ time taken.

Question 5

acceleration

Answer 5

acceleration is the measure of change in velocity/ speed. When an object is increasing in velocity/ speed we say it is accelerating. average accelerating= change in speed/ time taken which can also be final speed- initial speed/ time taken.

Question 6

velocity- time graphs

Answer 6

gradient= velocity- time graph gives the acceleration of the object.
the area under the graph represents the displacement of an object.

Question 7

Newton Laws

Answer 7

1. An object will remain at rest or travel at a constant speed in a straight line unless acted upon by an external force.
2. the acceleration of an object is directly proportional to the net force acting on it, and inversely proportional to the mass od that object.
   net force= mass x accaleration
   Fnet= ma

Question 8

weight

Answer 8

weight= is a force which is measured in Newtons and requires gravity.
weight force= mass (kg) x Gravity.
gravity = 9.8 m/s to the power of 2
therefore 70 kg has a weight force of 70 x 9.8= 686 N