Newton's 1st Law is also known as the law of ______________.
Inertia
100
Newton's 2nd Law shows the relationship among which three quantities?
Force, mass, and acceleration.
100
What is Newton's 3rd Law also called?
action/reaction law
100
What is a force?
A push or pull
100
Name the 3 types of friction.
Sliding, rolling, and static
200
State Newton's 1st law. (Must completely state the law)
An object at rest remains at rest, and an object in motion remains in motion AT CONSTANT SPEED AND IN A STRAIGHT LINE, unless acted on by an unbalanced force.
200
State Newton's 2nd Law
Force= mass X acceleration
200
State Newton's 3rd Law.
For every action, there is an equal and opposite reaction
200
What 2 things should you describe about a force that acts on an object?
the size and direction
200
What is the difference between instantenous speed and average speed?
Instantaneous speed is the speed at a certain moment. Average speed is the average of the instantenous speed over a certain period of time.
300
What does Newton's 1st Law say about a moving object if the forces on the object are balanced?
The object will remain in motion at a constant speed and in a straight line.
300
A 5N force acts on an object, but it doesn't move. How is this possible?
The force is balanced by an equal and opposite force. Balanced forces cause no change in motion.
300
You apply a force to a soccer ball when you kick it. Compare this force to the force that the soccer ball exerts on your foot.
The two forces are equal in strength, but opposite in direction.
300
What is friction?
The force that resists the movement of one surface past another.
300
Why don't you notice the gravitational pull of your school desk?
The mass of the desk is too small.
400
Which has greater inertia, a beach ball or a bowling ball? EXPLAIN
The bowling ball because it has greater mass.
400
State one of the 3 formulas that can be used to solve for either force, mass or acceleration.
F=ma
m=F/a
a=F/m
400
A bowling ball rolls down a lane and strikes a bowling pin. Which is greater, the force of the ball on the pin or the force of the pin on the ball? EXPLAIN
According to Newton's 3rd Law, the forces are equal.
400
What is the difference between speed and velocity?
Velocity shows DIRECTION
400
In what direction does friction act on a moving object?
Opposite the direction of motion
500
Described how a ball moves when released.
Travels at constant speed and in a straight line.
500
The same unbalanced force is applied to objects A, B, and C. Object B has the greatest acceleration, and object A has the least. Rank the MASSES of the 3 objects.
A --> C --> B
500
Which has greater momentum, a car sitting still or a pebble rolling down a hill? EXPLAIN
The pebble has greater momentum. An object that isn't moving has zero momentum
500
What is momentum?
The force needed to stop a moving object.
500
Three men want to push a stalled car into a garage. Predict whether the car will be easier to push before it begins to move or after it is moving. EXPLAIN
It should be easier to push after it is moving, because rolling friction is usually less than static friction