The concepts of Newton's First Law of Motion are essential to understanding dynamics. Answer the following questions to check your conceptual understanding before we look at using free-body diagrams to find whether the forces are balanced or unbalanced.
In a mythological friction and air resistance-free environment you throw a ball. After the ball leaves your hand, the ball will...
- gradually come to a stop.
- continue forever in the direction you throw it.
- speed up indefinitely.
- not leave your hand.
According to Newton's First Law, the ball will move with a constant velocity until an outside force acts on it.
According to Newton's First Law, the ball will move with a constant velocity until an outside force acts on it.
According to Newton's First Law, the ball will move with a constant velocity until an outside force acts on it.
According to Newton's First Law, the ball will move with a constatn velocity until an outside force acts on it.
A 5 kg object is moving in a horizontal direction. How much force do you need to keep that 5 kg object moving at a constant velocity?
- 0 N
- 5 N
- 10 N
- 15 N
An object will remain at a constant velocity unless a force acts on it.
An object will remain at a constant velocity unless a force acts on it.
An object will remain at a constant velocity unless a force acts on it.
An object will remain at a constant velocity unless a force acts on it.
A friend says that if you throw a 2 kg object faster, that it will have a greater inertia. Is this true?
- Yes, the faster an object goes, the more inertia it has.
- No, the faster an object goes, the less inertia it has.
- No, the speed of an object does not give a measure of inertia.
- There is not enough information to decide.
Inertia depends only on an object's mass.
Inertia depends only on an object's mass.
Inertia depends only on an object's mass.
Inertia depends only on an object's mass.
A change in ______ indicates an unbalanced force is acting on an object.
- speed
- direction
- neither speed or direction
- both speed or direction
An unbalanced force will cause a change in an object's speed and/or direction.
An unbalanced force will cause a change in an object's speed and/or direction.
An unbalanced force will cause a change in an object's speed and/or direction.
An unbalanced force will cause a change in an object's speed and/or direction.
You are pushing an object across a table at a constant velocity. Which of the following must be true?
- All the forces on the object are balanced.
- All the force on the object are unbalanced.
- There is only one force acting on the object.
- The push force is greater than the force that goes against the push.
Since the object is moving at a constant velocity, the forces must be balanced.
Since the object is moving at a constant velocity, the forces must be balanced.
Since the object is moving at a constant velocity, the forces must be balanced.
Since the object is moving at a constant velocity, the forces must be balanced.
Summary
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