Motion & Newtons Laws Flashcards
If two objects have different masses which object is easier to Accelerate ? Which law supports your answer?
The object with the least mass requires less force
Second law
The tendency of an object to resist change in its motion is known as
Inertia
First law
Speed equals distance divided by
Time
On a graph showing distance versus time, a horizontal line represents an object that is
Not moving at all ( at rest, stopped)
Give an example of negative acceleration
Car approaching a red light, a ball rolling to a stop
If a bicyclist travels 30 km in two hours, her average speed is
S = D/T
15 km/h
In speed versus time graph, a diagonal straight line shows that acceleration is
Constantly speeding up
A person traveling in a car that stops suddenly keeps moving forward due to
Inertia
If the action force of a bad striking a ball accelerates the ball in One Direction, the reaction force accelerates the bat in the opposite direction
Newtons third law
The total distance traveled divided by the total time taken to travel the distance is
Average speed
Newtons first law of motion states that an object remains at rest unless a —— force acts on it
Unbalanced
They statement for every action, there is an equal but opposite reaction is a statement of
Newtons third law
When I swimmer pushes the water back, the water pushes the swimmer ford. What is the reaction force in this situation?
They water pushing the swimmer forward (opposite)
If you push a skateboard that has a mass of 60 kg with a force of 6N, What force will the skateboard pushback on you according to newtons third law of motion?
6N (it’s equal because of the third law)
Forces that are equal in size but opposite indirection and cause no change in motion are —— forces
Balanced forces
Define displacement and give an example of when displacement and distance would be equal and when they would be different
Displacement is the distance and direction an object is from starting point to stopping point
What is the key factor in determining if an object is in motion?
Change in position relative to a reference point
What is the motion of an object with zero acceleration?
At rest or at a constant speed (no change in motion)
What is the acceleration formula
A = (final speed - initial speed) divided by time
If a family took a vacation and was traveling 60 mph, how far would they have traveled after three hours?
180 miles
What two things affect the momentum of a moving object?
Mass and velocity (size and speed)
