CA #1 Motion, Speed, and Acceleration

Ways that an object can accelerate.

Speed up, Slow down, Change Direction, Free fall

An airplane flies with an airspeed of 200 km/hr South. The airplane encounters a headwind moving at a 50 km/hr North. What is the actual velocity of the airplane relative to the ground?

150 km/hr South

What forces cause an object in free fall to reach terminal velocity.

Gravity and air resistance

A passenger on a train is moving at a steady speed is at rest relative to

The seat next to them.

The slope of a line on a distance-time graph shows

speed

What are two quantities necessary to describe motion? (remember it is a vector)

Direction and Speed

A train approaching a crossing changes speed from 20 m/s to 5 m/s in 200 seconds. Describe the train's acceleration.

The acceleration is negative. (it is slowing down)

1 kilometer equals 1000 meters. What does the prefix kilo mean?

1000

frame of reference

a system of objects that are not moving with respect to one another

Vector

A quantity that has magnitude and direction

Which distance can be most accurately measured with a ruler?

The width of a book.

The object is at rest or not moving.

What does the graph show?

Displacement vectors of 4 km South, 5 km North, and 2 km South combine to a total displacement of

1 km South

Speed

The ratio of the distance an object moves to the amount of time needed to travel the distance.

A person drive 6 block North, then Turns West and drive 6 blocks. The driver then turns South and drives 6 blocks. What is the driver's displacement?

6 block West

Displacement

Distance and direction of an object's change in position from the starting point in a straight line.

distance

The length of a path between two points

Objects in free fall near the surface of the Earth experience

constant acceleration

Green

Which colored line on the graph shows the object moving at the fastest constant speed?

An object is moving at 25 m/s takes 5 seconds to come to a stop. What is the objects acceleration?

- 5 m/s/s

10 m/s

At the point of the arrow what is the average speed?

Is an example of constant acceleration due only to direction change...

traveling around a circular track

instantaneous speed

speed at a specific instant in time

A child spinning on a merry-go- round is an example of...

acceleration

A horizontal line on a distance-time graph means the object is

not moving

vector addition

adding or combining quantities that have magnitude and direction

constant acceleration

This graph shows

Accleration

The rate at which velocity changes

If I start at my house and walk for 6 miles until I reach my house again, what is my displacement?

0

A car speedometer measures

instantaneous speed

9.8 m/s2

acceleration due to gravity