# Force and Motion - General

General questions about force and motion
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Questions #: 10
Time: 10 minutes
Pass Score: 80.0%
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#### Train Travel

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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#### Object acceleration

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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#### Acceleration units

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

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32
9.8
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#### Distance covered during acceleration

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

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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#### A pencil on a car

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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increase
descrease
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#### Friends pulling against each other

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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towards the first boy
towards the former friend
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#### Force on object

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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east of north
east
north
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