Physics 1st Interim Assessment 1 Review GCA 1819

Which is a way to accelerate?

• speed up

• slow down

• change directions

• All of these are ways to accelerate!

On a Velocity Time graph, a line showing zero acceleration (constant velocity) will be

• straight and directed downhill line (A)

• straight and directed uphill (lines B and D)

• horizontal (line C)

• vertical (not shown in the picture)

Speed is a ______ and velocity is a _______.

• scalar; scalar

• vector; vector

• scalar; vector

• vector; scalar

If you ignore air resistance, all object fall

• at the same rate, -9.8 m/s².

• at different rates depending on their mass.

• at different rates depending on their volume.

• at the same rate, +9.8 m/s².

A straight uphill line on a distance time graph (see picture) means

• the object is not moving.

• the object has a constant velocity.

• the object is accelerating.

• the object is moving backwards.

Which object is accelerating?

• A car with cruise control on driving down a straight road.

• Your sleeping dog.

• Fan blades on a rotating ceiling fan.

• A hovering helicopter.

Which requires a direction?

• All scalars.

• All vectors.

• Only some scalars like time and distance.

• Only some vectors such as acceleration and force.

As an object falls,

• it keeps a constant speed.

• it covers more distance each second.

• it's acceleration increases.

• it covers the same amount of distance each second.

As you run laps, your average speed decreases each time you go around the track. Because you are slower, each lap takes more time to complete than the previous one.

Your speed and time are ____ related.

• directly

• inversely

• not

When the graph has a downhill slope (after 11 seconds),

• the object has a constant acceleration.

• the object is falling.

• the object is moving forwards.

• The object is moving backwards towards the starting point.