Vocabulary
What is the SI unit of force?
What is "Newtons"?
What is another name for Newton's 1st Law?
What is "Law of Inertia"?
What equation represents Newton's 2nd Law?
What is "F=ma"?
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 do we call "a push or pull acting on an object"?
What is "the force that pulls two objects toward one another, generally downward"?
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.
What is "the tree"?
A 4 kg object experiences a net force of 20 N. Find its acceleration.
What is "5 m/s² "?
When a swimmer pushes water backward, what force moves the swimmer forward?
What is "The water pushes the swimmer forward."?
What do we call the vector sum of all forces acting on an object?
What is "Net Force"?
What happens to an object at rest when net force is zero?
What is "it remains at rest"?
A net force of 60 N produces acceleration of 3 m/s². Find the mass.
What is "20kg "?
Share an example of Newton's 3rd Law.
A 10 kg box has 40 N right and 40 N left. Is it necessarily at rest? Explain.
What is "No. Zero net force means zero acceleration; it could be at rest or move at constant velocity."
What do we call "a change in a moving object's speed or direction"?
What is "acceleration"?
A car turns left at constant speed. Is its net force zero? Explain.
What is "No. Its direction changes, so its velocity changes; there must be a nonzero net force."?
An 8 kg box has 50 N right and 18 N left. Calculate its net force and acceleration.
What is "32 N right; 4 m/s² right."?
***DAILY DOUBLE*** 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 (Identify Action and Reaction).
What is "the action is pushing off of the side of the pool, the reaction is being propelled forward"?
Ms. Medina is going down the sidewalk on her skateboard; Ms. Yap decides to get on too. What will Ms. Medina have to do to keep the skateboard moving at the same velocity?
What is "push with more force"?
What is the definition of "inertia"?
What is "an object's tendency to resist any change in its motion"?
A spacecraft moves through empty space with engines off. One student says it slows because no force keeps it moving. Is this true or false? Explain.
What is "This statement is false. No extra force is needed to maintain velocity. With zero net force, it keeps moving at constant velocity in a straight line."?
A 6 kg cart has 24 N right and 12 N left. A second cart has twice the mass and experiences the same net force. Compare their accelerations.
What is "Net force is 12 N right. First cart: 2 m/s² right. Second cart (12 kg): 1 m/s² right, half as much."?
A truck collides with a small car. The truck has more mass. Which vehicle experiences the greater force? Do their accelerations differ? Explain why.
What is "Neither: forces are equal in magnitude and opposite in direction. Yes, accelerations differ because mass affects acceleration. More mass makes it harder to accelerate the object."?
Mrs. Clark 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?
What is "the water spills on the radio because it has inertia and wants to continue moving forward even though the car has stopped"?