Physics Ch.3

The speedometer of an automobile reads

• average speed

• instantaneous speed

• accelerated speed

The average speed of a horse that gallops 10 kilometers in 30 minutes is

• 15 km/h

• 20 km/h

• 30 km/h

• 40 km/h

A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be

• less

• the same

• more

If an object moves with constant acceleration, its velocity must

• be constant also

• change by the same amount every second

• . change by varying amounts depending on its speed

• always decrease

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

• in the direction of the motion

• opposite its velocity

• directed upward

• directed downward

The accelerations possible for a ball on an inclined plane

• range from zero to g

• range from g to infinity

• have no limit

While an iron block near the Earth's surface is in free fall, it undergoes an increase in

• speed

• acceleration

• both of these

• neither of these

If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about

• 60 m

• 120 m

• 180 m

• more than 200

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by

• 10 m/s

• 20 m/s

• 30 m/s

• 40 m/s

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

• 10 m/s

• 20 m/s

• 30 m/s

• 40 m/s