Motion

Trajectory is...

• the line described by an object in movement

• the path where the object moves through space.

• the place where an object is located.

• Two anwers are correct

Answer explanation

the line described by an object in movement and the path where the object moves through space.

Identify the wrong sentence

• When the trajectory is straight is called rectilinear

• When the trajectory is a circle, the trajectory is called circular

• Position on the left of the reference system are often taken as negative.

• We call initial position to the ending place.

Displacement is...

• different from distance

• the same of distance

• the distance travelled by an object in movement

• a velocity

The International System Unit for Speed is ...

• km/h

• m/s

• cm/min

• km/s

The ecuation of velocity is ...

• V=S/t

• V=t/S

• V=a/t

• V=t/a

An object is moving during an interval of time (t-t₀) with constant velocity

• There isn´t movement

• It´s not a uniform movement

• It´s a uniform movement

• It´s an accelerated movement

When the speed of an object in motion varies we say there is...

• velocity

• acceleration

• speed

• graphs

Position-time graphs...

• tell us the trajectory

• don´t tell us anything about the trajectory

• tell us the path

• tell us the shape of the path

What is the acceleration of a bike that goes from 38 km/h to a stop in 4.5s?

• 2.45 m/s²

• 2.25 m/s²

• 2.35 m/s²

• 2.55 m/s²

The area under the grahph v-t is equal to ...

• the acceleration of an object

• the distance travelled in an interval of time

• the trajectory

• the displacement of the complete movement