Ap Physics - Forces and Newton's Laws of Motion

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What is a force? What does it do?

A force is a push or a pull. A force acts on an object and requires an agent.

A force is also a ______.

vector

What are the two types of force?

A contact force and a long range force.

What is a net force?

The vector sum of all the forces.

What is the formula for net force?

F1 + F2 + F3 + e.t.c = Fnet

What steps do you take to graph a force vector?

1\. Represent the object as a particle/dot. \n 2. Place the tail of the force vector on particle. \n 3. Draw it pointing in the direction that the forces acts with a length proportional to the size of the force \n 4. Give the vector an appropriate label

What are the eight forces?

1\. Weight \n 2. Spring force \n 3. Tension force \n 4. Normal Force \n 5. Friction \n 6. Drag \n 7. Thrust \n 8. Electric and magnetic forces

What is weight?

The gravitational pull of the earth on an object on or near the surface of the earth. The symbol for weight is w. 

An object’s weight vector _____, no matter ______.

An object's weight vector always points vertically downward, no matter how the object is moving.

What type of force does a spring force exert?

Contact force.

What is the symbol for Spring force?

Fsp.

A spring can either _____ or _____.

A spring can either push (when compressed) or pull (when stretched). 

When a string or rope or wire pulls on an object, it exerts a contact force that we call ______.

The tension force, represented by T. 

The direction of the tension force is always _____.

In the direction of the string or rope.

The force exerted by a surface (the agent) against an object that is pressing against the surface.