The front seat of the car

A passenger in the rear seat of a car moving at a steady speed us at rest relative to?

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?

By driving west 6 blocks from the starting point

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?

4 meters

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?

2 km south

Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of?

the amount of the time needed to travel the distance

Speed is the ratio of the distance an object moves to

at a particular instant

Instantaneous speed is measured

speed

The slope of a line on a distance-time graph is

at rest

A horizontal line on a distance-time graph means the object is

more than one direction, velocity, and one speed

vector addition is used when motion involves

acceleration

The rate at which velocity changes is called

a ball moving at a constant speed around a circular track

What identifies a change in motion that produces acceleration?

constant acceleration

Objects in free fall near the surface of the Earth experience

traveling around a circular track

What’s an example the describes constant acceleration due ONLY to a change in direction?

acceleration

The slope of a speed-time graph indicates

Slowing down, changing direction, and gaining speed.

An object that is accelerating may be

How fast a velocity is changing at a specific instant

What is instantaneous acceleration?

Frame of references

The motion of an object looks different to observes in different…?

meter

The SI unit for measuring length is the?

Displacement

The direction and length of a straight line from the starting point to the ending point of an object’s motion is?

vectors

Displacement and velocity are examples of what? because they have both magnitude and direction.

resultant vectors

The sum of two or more vectors is called the?

m/s

speed is measured in units of?

instantaneous speed

A car’s speedometer measures

speed

v = d/t is the equation for?

direction

The difference between speed and velocity indicates the _____ of motion and speed does not

vector addition

two or more velocities add by

accelerate

a moving object does not ______ if its velocity remains constant.

gravity

Freely falling objects accelerate at 9.8 m/s2 because the force of _________ acts on them.

acceleration

The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant _____

speed

The acceleration of a moving object is calculated by dividing the change in _____ by the time over which the change occurs.

curved

Accelerated motion is represented by a _____ line o a distance-time graph.

positive

A car that increases its speed for 20 km/h to 100 km/h undergoes _____ acceleration.

Instantaneous acceleration

______ ______ is how fast a velocity is changing at a specific instant.

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

Mass:

is the force of gravity acting o an object.

Weight:

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

Inertia:

The law of Inertia

Newton’s 1st Law states:

Newtons (N)

SI unit for force

w=m.g

Weight formula:

kg x m/s(2)

1 N:

m/s(2)

N/kg

Push or pull on an object

Force

Magnitude and direction

Vector

Velocity, Acceleration, Force, and Gravity

List 4 things that are vectors

Newton

Force (SI unit):

m/s(2)

Acceleration (SI unit):

1 m/s(2)

Velocity (SI unit):

km x 1 m/s(2)

Formula for Newton:

forces combined when they are acting on an object (they can be pushed or pulled)

What is a net force?

balanced force

What do we call it when net forces are zero acting on an object (so there is no change in the object’s motion)?

True

True/False: All moving objects are subject to friction.

acceleration= net force / mass or a=f/m

Formula for Newton’s 2nd Law of Motion

mass x velocity

Formula for Momentum

kg x m/s

SI Unit for Momentum

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.

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

Newton’s Third Law of Motion

True

(True or False) Force always exist in pairs.

True

(True or False) Only when equal and opposite forces act on the same object do they result in a net force of zero.

True

(True or False) Momentum is a vector

If no net force acts on a system, then the total momentum does not change.

Law of Conservation

Momentum

What is conserved when 2 objects collide in a closed system?