4TH QTR Physics Reviewer

What is the net force acting on an object in equilibrium?

• Equal to its weight
• Equal to its mass
• Zero
• Equal to its velocity

Answer explanation

An object in equilibrium has zero net force acting on it.

What type of equilibrium occurs when an object is at rest?

• Dynamic equilibrium
• Translational equilibrium
• Static equilibrium
• Rotational equilibrium

Answer explanation

Static equilibrium occurs when an object is at rest.

What is the term for forces with lines of action through the same point?

• Normal forces
• Tension forces
• Concurrent forces
• Frictional forces

Answer explanation

Concurrent forces have lines of action through the same point.

What is the force a surface applies on another body perpendicular to the surface called?

• Tension
• Weight
• Normal force
• Friction

Answer explanation

Normal force is perpendicular to the surface.

What is the pulling or stretching force transmitted along a rope called?

• Normal force
• Weight
• Tension
• Friction

Answer explanation

Tension is the pulling force in a rope.

According to the equilibrium rule, what is the vector sum of forces acting on a non-accelerating object?

• Equal to its mass
• Equal to its weight
• Zero
• Equal to its velocity

Answer explanation

The vector sum of forces is zero for a non-accelerating object.

For an object resting on a level surface, what is the relationship between the normal force (FN) and the weight (W)?

• FN > W
• FN < W
• FN = W
• FN = 0

Answer explanation

For an object on a level surface, FN = W.

For an object hanging from a vertical rope, what is the relationship between the tension (T) and the weight (W)?

• T > W
• T < W
• T = W
• T = 0

Answer explanation

For an object hanging vertically, T = W.

If an object is suspended at an angle, what are the components of tension (Tx and Ty) related to?

• Tx = W, Ty = Fapp
• Tx = Tcos, Ty = Tsin
• Tx = Tsin, Ty = W
• Tx = W, Ty = Tsin

Answer explanation

Tx = Tsin and Ty = W.

A 10 kg object and a 20 kg object rest on a surface. What is the total normal force (FN)?

• 98 N
• 196 N
• 294 N
• 392 N

Answer explanation

FN = (10 kg + 20 kg) * 9.8 m/s^2 = 294 N.