Quiz: Forces in Two Dimensions

What does it mean for an object to be in equilibrium?

• The object is moving rapidly
• The net force acting on the object equals zero
• The object is accelerating
• The object is only acted upon by gravity

Which of the following is NOT a condition for equilibrium?

• The object is at rest
• The object is moving at a constant velocity
• The net force is greater than zero
• The forces acting on the object balance out

In a free-body diagram, what do the arrows represent?

• The speed of the object
• The forces acting on the object
• The direction of motion
• The mass of the object

If a box is resting on a flat surface, which forces are acting on it?

• Only gravity
• Gravity and normal force
• Gravity and friction
• Only normal force

What is the normal force acting on a 10 N object at rest on a horizontal surface?

• 0 N
• 5 N
• 10 N
• 20 N

If two forces of 5 N East and 3 N North are acting on an object, what is the equilibrant force?

• 5 N East
• 3 N North
• √(5² + 3²) N at an angle
• 8 N South-West

What happens to the forces acting on an object if it is in equilibrium?

• They increase
• They decrease
• They balance out to zero
• They become unbalanced

Which of the following forces acts perpendicular to the surface of an inclined plane?

• Weight
• Normal force
• Friction force
• Tension

When analyzing forces on a ramp, which component of weight acts parallel to the ramp?

• Weight × cos(θ)
• Weight × sin(θ)
• Weight
• Normal force

What is the role of friction on an inclined plane?

• To increase speed
• To oppose motion
• To provide lift
• To balance weight