Revision before dynamics exam

Units

100

What is the unit of force?

Newton

200

What is the unit of momentum?

kg*m*s^-1

300

Is the unit of the impulse of force the same as the unit of momentum?

Yes

400

Is this statement correct? The unit of centripetal acceleration is rad*s^-2.

No, it is an acceleration, so the unit is m*s^-2.

500

Is this statement correct? The unit of coefficient of friction is Newton, because it is connected with friction force.

No, coefficient of friction has no unit.

Equations

100

How can we calculate angular velocity?

ω= 2πf or ω=2π/T or ω= v/r

200

How can we calculate friction force?

F_F= f*F_N

300

Is this statement correct? The impulse of force is calculated as force times the time.

Yes, I = F*t

400

Prove that we can write the equation of the second Newton's law, F = m*a, using the momentum.

F = m*a = m*(v/t) = p/t

500

How can we calculate the gravitational force F_g?

F_g = κ (m*M/r²)

Newton's laws

100

Which law is talking about the resultant force that is zero?

1st Newton's law

200

Which law is talking about the change of the state of an object by acting on it with some force?

2nd Newton's law

300

Which law can be written as this equation: F₁ = - F₂?

3rd Newton's law

400

In dynamics of circular motion, which law is not applied?

1st Newton's law

500

What does impulse of force mean and to which law it is connected?

Impulse of force represents the change of momentum, it is connected to 2nd Newton's law.