A passenger in the rear seat of a car moving at a steady speed us at rest relative to?
The front seat of the car
A person walks 1 mile every day for exercise, leaving her front porch at 9:00 am. and returning to her front porch at 9:25 am. What is the total displacement of her daily walk?
A person drives north 6 blocks, then turns west, and drives 6 blocks. The driver then turns south and drives 6 blocks. How could the driver have made the distance shorter while maintaining the same displacement?
By driving west 6 blocks from the starting point
A ball is rolled uphill a distance of 5 meters before it slows, stops and begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball's displacement?
Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of?
2 km south
Speed is the ratio of the distance an object moves to
the amount of the time needed to travel the distance
What identifies a change in motion that produces acceleration?
a ball moving at a constant speed around a circular track
What's an example the describes constant acceleration due ONLY to a change in direction?
traveling around a circular track
The direction and length of a straight line from the starting point to the ending point of an object's motion is?
Displacement and velocity are examples of what? because they have both magnitude and direction.
The difference between speed and velocity indicates the _____ of motion and speed does not
The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant _____
The acceleration of a moving object is calculated by dividing the change in _____ by the time over which the change occurs.
Is the amount of matter in an object, a measure of the inertia of an object, which depends on the amount of matter the object contains
An object that is in motion stays in motion and an object at rest stays at rest as long as the net forces acting on that object are zero
What is a net force?
forces combined when they are acting on an object (they can be pushed or pulled)
What do we call it when net forces are zero acting on an object (so there is no change in the object's motion)?
Newton's Third Law of Motion
For every action there is an equal and opposite reaction.
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
(True or False) Only when equal and opposite forces act on the same object do they result in a net force of zero.