Unit 2 Forces Review

What is the force of friction of an object that has a normal force acting on it of 50N and a coefficient of friction between the object and the surface of 0.1?

• 5 N

• 10 N

• 50 N

• 500 N

In which direction is the NET FORCE that acts on the object represented in the motion map shown?

• Right

• Left

• No net force

• Unable to determine

The velocity vs time graph shows the velocity at various times for three objects of identical mass. Which object has the greatest net force acting on it??

• A

• B

• C

• All experience the same force

A position vs time graph shows an object's position starting at rest, then moving in the negative direction at an increased rate over time. Which of the following net forces could be responsible for this object's movement?

• 6 N

• 0 N

• • - 5 N

• 100 N

The object in this accceleration vs time graph has what type of net force acting on it at all times shown in the graph?

• Negative

• Zero

• Positive

• Constant

AT whcih of the following time intervals is the kinetic friction acting on the object shown in this force vs time graph?

• 0 s

• 3 s

• 6 s

• Never

Kinetic friction is ______________ of the applied force while the object is moving, while static friction is ______________ of an applied force while the object is at rest.

• dependent; independent

• dependent; non-existent

• independent; non-existent

• independent; dependent

The coefficient of friction is

• dependent only on the mass.

• dependent only on the normal force.

• dependent only on the friction force.

• dependent only on the strength of the interaction between the surfaces in contact.

A set of objects, made from the same material and at rest on the same surface, all experience the greatest force possible acting on them (different for each) that does not allow them to move. Which object has the greatest static friction acting on it?

• the one with the least mass

• the one with the most mass

• the have the same frictional force

• unable to determine

How do we determine the force acting on a mass by reading a velocity vs time graph?

• Multiply the area by the mass

• Multiply the slope by the mass

• Divide the area by the mass

• Divide the slope by the mass