Vocab.
How far an object moves in a given amount of time is a measure of its ________________.
speed
What is the formula for speed?
speed = total distance traveled / total time.
What is Newton's Second Law equation?
F=MxA
Who is your favorite teacher?
Ms. Sol
The rowers' oars exert an action force on the water. The water exerts an equal reaction force on the oars, but in the opposite directions. The boat moves forward. What is this an example of?
Newton's 3rd Law
When an object undergoes____________, it speeds up, slows down, stops, or changes directions.
acceleration
A train travels 100 miles in 2 hours. How fast was the train moving?
50 mph
What does F=MxA stand for?
Force equals mass times acceleration.
Explain Newton's Second Law with walking.
When you walk, your foot pushes backward against the ground (action force).
The ground pushes forward with an equal force (reaction force), propelling you forward.
If you throw a ball in a straight line, it moves in a straight line until gravity pulls back to earth. This is an example of _____________.
Newton's 1st Law
Newton's 3rd law of motion can be stated this way: For every __________, there is an equal and opposite _____________.
action, reaction
Define friction.
Friction is the action of one surface or object rubbing against another.
A larger force results in a ________ acceleration for the same mass.
larger
If a book is placed on a table, what is the action? What is the reaction?
The action is the book is pushing against the table. The reaction is the table is pushing on the book.
If you hit a basketball and a golf ball with a bat (using the same force), the golf ball goes further because of ___________.
Newton's 2nd Law
Speed in a particular direction is ____________.
Velocity
Friction causes __________.
heat
A larger mass requires a _______ force to achieve the same acceleration.
greater
The forces are equal in force, but ________ in direction.
opposite
If an astronaut throws a tennis ball in outer space, what happens to the object? Use Newton's 1st Law of Motion to justify your answer!
When an astronaut throws a tennis ball in outer space, the ball will continue to move in a straight line at a constant speed until a net force acts upon the ball. This is based on Newton's first law, which states, an object will stay in uniform motion, until a net force is applied.
Unlike speed, velocity includes_________.
direction
Label whether each problem below is describing the velocity, speed or acceleration.
You do NOT need to solve the problems.
1. A train moves south at 90km / hour.
2. A jet plane travels at 600 km/hr.
3. A car moving at 60 mi/hr slows to 40mi/hr.
1. velocity
2. speed
3. acceleration
Pushing a heavier object requires _______ force to accelerate it compared to a lighter object.
more
What happens when a rocket blasts off towards outer space? Use Newton's Third Law of Motion to justify your answer! Describe or illustrate the action and reaction force.
When a rocket blasts off towards outer space, the rockets pushes towards the center of the earth and the earth pushes against the rocket. This causes the rocket to accelerate towards outer space. For every action, there is a reaction.
Drawings may vary.
What happens to a soccerball when a player hits it? Use Newton's Second Law of Motion to justify your answer!
The a soccerball is hit, the force of the kick changes the speed (acceleration) of the soccer ball (mass). Newton's Second Law states, F=MxA.