Forces Unit Review

Which of the following is the cause of an acceleration?

• Speed

• Inertia

• Force

• Velocity

What causes a moving object to change direction?

• Acceleration

• Velocity

• Inertia

• Force

Which of the following forces exists between objects even in the absence of direct physical contact?

• Frictional Force

• Fundamental Force

• Contact Force

• Field Force

A newton is equivalent to which of the following quantities?

• kg

• kg•m/s

• kg•m/s²

• kg•(m/s)²

The length of a force vector represents the

• cause of the force.

• direction of the force

• magnitude of the force.

• type of force.

A free-body diagram represents all of the following except

• the object.

• forces as vectors.

• forces exerted by the object.

• forces exerted on the object.

In the free-body diagram shown on question 7 of the review, which of the following is the gravitational force acting on the car?

• 5800 N

• 775 N

• 14 700 N

• 13 690 N

Which of the following is the tendency of an object to maintain its state of motion?

• acceleration

• inertia

• force

• velocity

A crate is released on a frictionless plank inclined at angle θ with respect to the horizontal. Which of the following relationships is true? (Assume that the x-axis is parallel to the surface of the incline.)

• Fy = Fg

• Fx = 0

• Fy = Fx

• none of these

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is

• greater than the normal force times the coefficient of static friction.

• equal to the normal force times the coefficient of static friction.

• the normal force times the coefficient of kinetic friction.

• zero