Principles Of Motion And Energy

Question 0

What is the difference between speed and velocity?

Answer 0

Speed is the rate of motion or displacement over time. It is a scalar quantity so does not indicate direction. Velocity indicates which direction as well magnitude. It is a vector quantity.

Question 1

What is required to change an object’s motion?

Answer 1

Force

Question 2

What is acceleration?

Answer 2

Change in the velocity over time. a=v/t it is a vector quantities so indicates magnitude and direction

Question 3

What is the distinction between acceleration, velocity, and speed?

Answer 3

They are all rated of change, but velocity and speed measure the rate at which the position changes, while acceleration measures the rate at which the velocity changes.

Question 4

How are velocity and acceleration depicted graphically?

Answer 4

Both can be represented as a slope of a line. Time makes up the x-axis(horizontal) and position makes up the y-axis. The slope will indicate the value of velocity or speed.

Question 5

What causes acceleration?

Answer 5

There must be an unbalanced force applied to the object as defined by Newton’s first law (when no force acts on an object, or when forces acting on it cancel, it moves in a straight line at a constant speed

Question 6

How is pressure related to force?

Answer 6

Pressure is force divided by area. p=f/a. A sharp knife cuts better because the same amount of force is applied to a smaller area.

Question 7

What type of line would be displayed on a graph showing positive acceleration?

Answer 7

A curved line going up