Acceleration

As a car is driven south in a straight line with constant speed, the acceleration of the car must be ______.

• Zero

• Directed Southwards

• directed northward

• constant, but not zero

Identify which of the following can all be true about the motion of an accelerating object.

• A

• B

• C

• D

If an object’s velocity and acceleration have the same direction, then the object is _______.

• at rest

• speeding up

• slowing down

• moving at a constant velocity

Over the nine-second interval shown, we can say that the acceleration of the particle ____

• only increases

• increases and then decreases

• decreases and then increases

• remains constant

Over the nine-second interval shown, we can

say that the speed of the particle ___.

• only increases

• increases and then decreases

• decreases and then increases

• remains constant

Which of the objects is/are moving with a constant velocity?

• A only

• A and E only

• B and C only

• A,B and C only

Which object has a constant negative acceleration throughout its motion?

• B

• C

• D

• E

When is the acceleration zero?

• A

• B

• C

• D

When is the acceleration negative?

• A

• B

• C

• E

As a car is driven south in a straight line with decreasing speed, the acceleration of the car must be:

• zero

• directed northward

• directed southward

• constant, but not zero