Show:
Definitions
Definitions
Definitions
Questions
Questions
100
What is acceleration?
A change in objects speed or direction.
100
What is inertia?
Inertia is the tendency of objects to keep doing what they're doing.
100
What is Newton's Second Law?
Newton's Third Law of Motion is for every action, there is a reaction.
100
If you hit a home run in space, what would happen?
Newton's First Law of Motion states that an object will keep doing what it's doing if the force is acting on it are balanced, this means that an object not moving, will continue to not move.
100
Going faster- Going slower- Changes direction-
A car pushes on the gas pedal. When a car presses on the break.
200
What is contact force?
A force that must touch an object to change it's speed and or direction.
200
What is net force?
Net force is the amount by which the opposing forces acting on an object are unequal.
200
What is noncontact?
Noncontact is a force that acts on an object to change its speed and direction from a distance.
200
Suppose you are playing baseball and hit a home-run. What forces slow the ball while it's in motion?
Scientists also believed that objects in motion on Earth required a force to keep them in motion.
200
Dave is driving down the street. If Dave steps on the brakes, what force slows the car?
Friction slows down cars because of tires and roads.
300
What is force?
Force is a push or pull that causes something to change its motion.
300
What is newton?
Newton is the metric unit used to measure fore or weight.
300
What is a normal force?
A normal force is the force that pushes up to support the weight of an object.
300
If you hit a home-run in space, what would happen?
Newton's First Law of Motion states that an object will keep doing what it's doing if the forces acting on it are balanced, this means that if an object is not moving, it will continue to not move.
300
What force causes a ball to speed up as it rolls down a hill?
Gravity causes a ball to speed up as it rolls down a hill.
400
What is friction?
Friction is a force that occurs when two things move past each other and rub together.
400
What is Newtons First Law?
Newton's First Law of Motion states that forces acting on an object are balanced, the object will continue doing what it's doing.
400
Gabe kicked a soccer ball across a field. The boll rolled for a while but eventually stopped. If Newton's first law is true, it seems like the ball Gabe rolled will continue rolling forever. Why does the ball stop?
Scientists believe that the "natural" state of an object on Earth was to be at rest.
400
Suppose that Sharon rides her bike at a speed of 10m/s. As she rides up a hill, her speed decreases to 5m/s. Is her acceleration positive or negative?
Her acceleration is negative because she is going at a constant speed.
400
Sharon cruises at 7m/s. She then uses her brakes and comes to a gentle stop. As Sharon slows, how does the direction of the net force compare to that of her motion?
The net force is west opposite the direction of her motion. (negative acceleration.)
500
What is gravity?
Gravity is a force that acts without physical contact to pull two objects toward each other.
500
What is Newton's Second Law?
Newton's Second Law of Motion states what the acceleration of an object is related to the net force acting on it and the mass of the object.
500
Suppose you are playing baseball and hit a home-run. What forces slow the ball while it's in motion?
Scientists also believed that objects in motion on Earth required a force to keep them in motion.
500
Now suppose Sharon rides her bike down the street in 20 seconds. During this time, her speed remains at a constant at 5m/s. What is the value of her acceleration during this time?
Her speed is at 0 m/s because she is going at a constant speed.
500
Think back to the story of Alicia and the soccer ball. Using Newton's Third Law of Motion, explain how she could kick the ball into the goal.
Alicia exerts a force on the ball exerts an equal and opposite force back on her. Alicia has a greater mass than the ball, but Alicia's motion did not change