Flashcards in Motion & Newton's Laws Deck (20):
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– 2nd law
The tendency of an object to resist change in its motion is known as __________.
inertia (1st law).
Speed equals distance divided by __________.
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.
A car approaching a red light; a ball rolling to a stop.
If a bicyclist travels 30 kilometers 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__________.
Which law is this?
Newton's 1st Law
If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the __________ direction.
opposite (3rd law)
A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. What is the average acceleration? A=F(s)-I(s)/T _______
The total distance traveled divided by the total time taken to travel the distance is __________.
Newton's first law of motion states that an object remains at rest unless a(n) __________ force acts on it.
The statement "for every action, there is an equal but opposite reaction" is a statement of Newton’s ___ law.
When a swimmer pushes the water back, the water pushes the swimmer forward. What is the reaction force in this situation?
The water pushing the swimmer forward. (opposite)
If you push a skateboard that has a mass of 60kg with a force of 6N, what force will the skateboard push back on you according to Newton’s third law of motion?
6N (It’s equal because of 3rd law.)
Forces that are equal in size but opposite in direction and cause no change in motion are ________ forces.
Define displacement. Displacement is the distance and direction an object is from starting point to stopping point.
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)