1.2 Accelerating in One and Two Dimensions

Acceleration is:

• the change of position over time

• the change of velocity over time

• a different way of saying speed

• a different way of saying displacement

From rest, a dog reaches a velocity of 6.3 m/s [forward] after 1.8 s. What is the dog's acceleration?

• 3.5 m/s² [forward]

• 3.5 m/s² [backward]

• 11.3 m/s² [forward]

• 3.5 m/s [forward]

When acceleration changes, the rate of its change is called the:

• speed acceleration

• acceleration boost

• jerk

• boom

In a velocity-time graph, acceleration is represented by:

• positive y-values

• the slope of the graph

• the area under the curve

• x-intercepts

True or false? When the acceleration remains at 0, that means velocity must also remain at 0.

• True

• False

When both acceleration and velocity are in the same direction, you are:

• going up

• staying still

• slowing down

• speeding up

When acceleration and velocity are in different directions, you are:

• going up

• staying still

• slowing down

• speeding up

In an acceleration-time graph, the area under the curve represents the object's:

• surface area

• displacement

• velocity

• acceleration

A cyclist travelling at 5.3 m/s [N] slows down to 3.7 m/s [N] over 4.7 s. What is his acceleration?

• 0.34 m/s²[N]

• 0.34 m/s²[S]

• 1.9 m/s²[N]

• 1.9 m/s²[S]

From rest, a toy rocket launched upward, reaching a velocity of 4.8 m/s [up] 8.0 m from the ground. What is the rocket's acceleration, assuming its constant?

• 2.9 m/s² [up]

• 2.9 m/s² [down]

• 1.4 m/s² [down]

• 1.4 m/s² [up]