Quiz on Forces and Motion Laws

Which of the following is the unit of universal gravitational constant?

• m/s^2

• km/s^2

• N/m^2 kg^2

• m^3 s^2/kg^2

Newton's third law talks about action and reaction forces. Which of the following statements about this force pair is incorrect?

• These forces occur at the same time.

• These forces are equal in size.

• These forces must act on different objects.

• These forces are equal in size and opposite in direction, thus the objects are in equilibrium.

Which of the following is incorrect?

• Friction is a vector quantity.

• Friction always acts in the direction of motion.

• Cars often skid on roads with spilled oil.

• Friction occurs when two objects are in contact.

Which of the following is not related to friction between tires and the road?

• Tire contact area

• Weight of the vehicle

• Surface texture of the road

• Tread pattern of the tire

What is the friction that occurs when two objects touch each other?

Which of the following is not related to friction between the wheel and the road?

• Area of the tire surface

• Weight of the vehicle

• Surface characteristics of the road

• Tread pattern of the tire

Which of the following correctly defines force?

• The state of motion of an object

• A quantity that has only magnitude

• A quantity that causes an object to maintain its state of motion

• A vector quantity that will change the state

Which statement about force is most accurate?

• It is a vector quantity because it has only magnitude

• It is a vector quantity because it has magnitude and direction

• It is a scalar quantity because it has only magnitude

• It is a scalar quantity because it has magnitude and direction

In the SI system, what is the unit of force?

• Kilogram

• Newton

• Gram

• Ton

While pulling a mass vertically, which equation can be used to find the tension in the rope?

• ∑F⃑=0

• ∑F⃑=1

• ∑F⃑=mg⃑

• ∑F⃑=ma⃑