Force and Motion - General

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A train goes 300 miles at an average speed of 45 miles per hour. 

It takes hours to go the distance  (Approximate decimal points to the first decimal point)

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An object is traveling with a speed of 2 m/s.  Three seconds later its speed is 14 m/s.

It is acceleration during this time is m/s²

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The acceleration of gravity in British units is ft/s².  The acceleration of gravity in metric units is m/s²

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An object accelerating by 4 m/s².  How far does it go in 3 seconds of acceleration?

distance = meters

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An object falling from rest reaches a speed of ft/s (or m/s) after falling 5 seconds.  (Ignore air resistance.)  At this time it has fallen ft (or m).

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Suppose you are a passenger in a car moving at 55 miles per hour.  You lift a pencil to the ceiling of the car and drop it.  Just before it hits the seat, how fast is it traveling forward? miles/hour.  Is the downward speed of the pencil increase or decrease?

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One boy pulls on his bicycle with a force of 15 pounds.  His (former) friend pulls on it with a force of 18 pounds in the opposite direction. 

1. What is the net force on the bike?
2. What is the direction of the net force?

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A force of 3 pounds is exerted toward the east on an object.  At the same time a 4-pound force toward the north is exerted on it. 

1. What is the net force on the object? pounds
2. Describe the direction of this force. 

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