Motion Question Preview (ID: 34510)
Motion, Plate Tectonics, And Acceleration.
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It can be important to know the velocity of an object, not just its speed, because
a) Velocity also tells direction
b) Velocity also tells acceleration
c) Speed is always an average
d) Speed is only useful for fast-moving objects
The trunk of a certain tree is 70 cm thick. Each year it gets thicker by 1 cm. How thick will the tree trunk be in 50 years?
a) 70
b) 100
c) 120
d) 4000
A rider finishes a 150-km bicycle trip in 3 hours. The average speed of the rider is
a) 450
b) 300
c) 5
d) 50 km/h
A car traveling at 20 m/s speeds up to 45 m/s over a period of 25 seconds. The average acceleration of the car is
a) 1 m/s2
b) 25 m/s2
c) 25 km/s2
d) cannot be calculated with the information given
How many centimeters are in a kilometer?
a) 100
b) 100,000
c) 1,000
d) 1,000,000
An airplane that moves 50 meters in one second has a speed of
a) 500 cm/s
b) 180,000 m/h
c) 1,800 km/h
d) 5,000 m/h
Measurements of acceleration are given in units of
a) distance/time
b) time2/distance
c) distance/time2
d) time/distance
Speed measurements are given in units of
a) distance/time
b) time2/distance
c) distance/time2
d) time/distance
A runner starts a 5-km race at 10:15 am and finishes at 10:35 am. Given this information, you can calculate the runner's
a) velocity
b) average speed
c) reference point
d) acceleration
An airplane flies 70 km in 10 minutes and then flies 110 km in 20 minutes. The average speed of the airplane is
a) 60 km/h
b) 8 km/h
c) 360 km/h
d) none of the above
An object is in motion if it is moving relative to a
a) speed
b) direction
c) reference point
d) average speed
To calculate the acceleration of an object moving in a straight line, divide the change in ______________ by the time during which the acceleration occurs.
a) speed
b) direction
c) reference point
d) average speed
The velocity of an object gives both its speed and _______________________.
a) reference point
b) speed
c) average speed
d) direction
You can calculate an _________ ______________ if you know both the TOTAL DISTANCE and the TOTAL TIME of a trip.
a) average speed
b) distance
c) reference point
d) direction
An object cannot be accelerating if it has a constant speed
a) true
b) false
c)
d)
The information needed for describing VELOCITY is distance, time, and direction
a) true
b) false
c)
d)
To determine the speed of an object, divide distance by acceleration
a) true
b) false
c)
d)
An object is in motion only if its distance from a reference point is stationary
a) true
b) false
c)
d)
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