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Physics: Vectors and Free-body Diagrams

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Questions and Answers

What is the condition for an object to topple?

The line of action of its weight must pass beyond the pivot (correct)

The object must have a large surface area

The line of action of its weight must be below the pivot

The object must be heavy

In projectile motion, what does 'X = R cos θ' represent?

The resistance force

The vertical component of motion

The horizontal component of motion (correct)

The driving force

What is the relation between velocity and time in displacement-time graphs?

Area under graph = velocity

Area under graph = acceleration

Gradient = acceleration

Gradient = velocity (correct)

Which force increases with speed and converts kinetic energy to heat and sound energy?

Resistance force Signup and view all the answers

According to Newton's laws of motion, what happens to an object's acceleration?

It is directly proportional to the resultant force Signup and view all the answers

What is the correct formula for finding the horizontal component of a vector?

X = R cos θ Signup and view all the answers

In a free-body diagram, which forces should be included?

All forces acting on the object Signup and view all the answers

What is the principle of moments for a body to be in equilibrium?

Sum of clockwise moments equals sum of anticlockwise moments Signup and view all the answers

What is a couple in the context of forces?

Two parallel forces acting in opposite directions Signup and view all the answers

Why does a body in stable equilibrium return to its original position after being displaced?

Due to the center of mass being directly below the point of support Signup and view all the answers