Vocabulary
the type of force that causes an object to change its motion
an unbalanced force
Finish the phrase: "An object in motion stays in motion and...
"an object at rest stays at rest unless acted on by an unbalanced force"?
the formula for Newton's 2nd Law
F=ma
Newton's 3rd Law states that...
every action has an equal and opposite reaction
A tennis ball is served, the tennis player on the other side of the net swings at the ball but misses. This law explains why the ball stays in motion until it hits the fence.
What is "Newton's 1st Law"?
What is the force that pulls two objects toward one another, generally downward?
gravity
In the following example, what is the unbalanced force: A car is driving down the street, but comes to an abrupt stop when it hits a tree.
the tree
Finish Newton's 2nd Law: Acceleration occurs when...
a force acts on a mass.
Explain how a dog leaping after a Frisbee demonstrates Newton's 3rd Law.
When the dog leaps, it pushes down on the ground. The reaction force of the ground pushes the dog into the air.
Which of Newton's Laws take force into consideration?
What is "all of them"?
the distance from one object to another is changing
What is "motion"?
If an object is not moving, it will continue not moving until...
what is " a force acts on it"
If a force of 10N occurs on a mass of 2kg, what must the acceleration be? (remember to use appropriate units!)
5 m/s2
A swimmer pushes off the side of the pool and is propelled forward by the force of the pool exerting a force on the swimmers foot. Explain this in terms of Newton's 3rd Law.
the action is pushing off of the side of the pool, the reaction is moving forward
Mrs. Orapollo is going down the sidewalk on her skateboard; Mr. Holmes decides to get on too. What will Mr. Holmes have to do to keep the skateboard moving at the same velocity?
What is "push with more force"?
Speed in a given direction is known as what?
Velocity
Another name for Newton's First Law.
"law of inertia"
Calculate the force of a 50 kg ball accelerating at 3 m/s2.
150 N
If you push on a wall with 30 N of force, the wall will push back with how much force?
30 N
Mrs. LB is driving down the road in her car and she has a glass of water. She has to stop very quickly. What happens (specifically!) to the water in the glass and why?
the water spills because it has inertia and wants to continue moving forward even though the car has stopped
What is inertia?
an object's tendency to resist any change in its motion
Why did the quarter fall into the cup when the index card was pulled away?
the quarter had inertia
What is the mass of an object traveling at 10 m/s2 with a force of 200N? (unit will be kg)
20 kg
While repairing the Hubble Telescope, which is in space, an astronaut turns a screwdriver clockwise. What direction will the astronaut turn?
What is "counter-clockwise"?
Why does a marble on the floor slow down and eventually stop rolling if Newton's 1st Law says an object in motion stays in motion?
What is "friction"?