Motion Quiz

When is the average velocity of an object equal to the instantaneous velocity?

• always

• never

• only when the velocity is constant

• only when the velocity is increasing at a constant rate

Speed is

• a measure of how fast something is moving

• the distance covered per unit time

• always measured in terms of a unit of distance divided by a unit of time

• all of the above

When you look at the speedometer in a moving car, you can see the car’s

• distance

• average velocity

• instantaneous velocity

• instantaneous speed

Acceleration is defined as the CHANGE in

• distance divided by the time interval

• velocity divided by the time interval

• time it takes to move from one speed to another speed

• time it takes to move from one place to another place

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car’s acceleration?

• 10 km/h/s

• 5km/h/s

• 35 km/h/s

• 40 km/s

An object travels 8 metres in the first second of travel, 8 metres again during the second second of travel, and 8 metres again during the third second. Its acceleration is

• 8 m/s/s

• 0m/s/s

• 16 m/s/s

• 32 m/s/s

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car’s average acceleration?

• 0.25 m/s/s

• 2.5 m/s/s

• 4.0 m/s/s

• 10 m/s/s

• 40 m/s/s

A car accelerates at 2 m/s/s. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?

• 2 seconds

• 15 seconds

• 30 seconds

• 60 seconds

• none of the above

The distance between a moving object's final position and its starting position.

• speed

• reference point

• velocity

• displacement

How is velocity different from speed?

• it includes the displacement of the object

• it includes the direction of the object

• it includes the distance of the object

• it includes the acceleration of the object