Forces & Net Force
A push or pull on an object.
What is a force?
The nickname for Newton's First Law.
What is the Law of Inertia?
The nickname commonly used for Newton's Third Law.
What is the Action-Reaction Law?
As an object's mass increases, this property also increases.
What is inertia?
The variable that a scientist intentionally changes during an investigation.
What is the independent variable?
When forces on an object are equal in size and opposite in direction, the net force is this.
What is 0 N?
The Newton's Law represented by the equation (F=ma).
What is Newton's Second Law?
A tennis ball pushes on a wall with 20 N. State the force the wall exerts on the ball.
What is 20 N in the opposite direction?
If mass stays the same and net force increases, this also increases.
What is acceleration?
The variable that a scientist measures in response to the change.
What is the dependent variable?
A box has a 25 N force to the right and a 10 N force to the left. Give the net force and direction.
What is 15 N to the right?
An object sitting on a desk will remain at rest until this happens.
What is an unbalanced/net force acts on it?
A swimmer pushes water backward. Identify the reaction force.
What is the water pushes the swimmer forward?
A 4 kg object experiences a net force of 20 N. Calculate its acceleration.
What is 5 m/s²?
Scientists conduct several trials instead of relying on one trial for this reason.
What is to improve reliability/reduce the effect of random variation?
A cart has 40 N acting right and 40 N acting left. Describe the forces and what they will do to the cart's motion.
What are balanced forces; they will not cause a change in motion?
Two objects experience the same net force. One has twice the mass of the other. This object will have the greater acceleration.
What is the object with less mass?
Air shoots backward out of an untied balloon. Explain why the balloon moves forward.
What is the balloon pushes the air backward and the air pushes the balloon forward with an equal and opposite force?
Two objects receive the same net force. Object A has a mass of 2 kg and Object B has a mass of 6 kg. Compare their accelerations.
What is Object A has the greater acceleration?
These two variables should appear in a well-written graph title.
What are the independent and dependent variables?
A sled is moving to the right when an unbalanced net force begins acting to the left. Describe what initially happens to the sled's motion.
What is it begins to slow down?
Explain why a loaded shopping cart is harder to start moving than an empty shopping cart using Newton's First Law.
What is the loaded cart has more mass, therefore more inertia, so it resists a change in motion more?
A small cart and a large cart collide. The small cart is damaged much more. Compare the forces they exert on one another during the collision.
What are equal-magnitude forces in opposite directions?
Object X and Object Y have the same acceleration, but Object Y has three times the mass. Compare the net forces required to produce those accelerations.
What is Object Y requires three times the net force?
In the crashing-carts investigation, identify both the independent variable and the dependent variable.
What are [your investigation's IV] and [your investigation's measured DV]?