Force and Motion Quiz

The distance an object travels per unit of time is called (a)   .

• Velocity

• Speed

• Acceleration

• Inertia

Answer explanation

The distance an object travels per unit of time is defined as speed. Unlike velocity, which includes direction, speed only measures how fast an object is moving, making it the correct choice here.

Match the following terms with their correct descriptions:

• A speed in a given direction.

• Force

• A push or pull on an object

• Speed

• The rate at which velocity changes with time

• Velocity

• The distance traveled per unit of time

• Acceleration

What does the term 'Fortis' mean in Latin?

• Inactivity

• Strong

• Fast

• Slow

Answer explanation

In Latin, 'Fortis' translates to 'strong'. This term is often used to describe strength or robustness, making 'Strong' the correct answer among the options provided.

What force pulls objects toward each other?

• Inertia

• Acceleration

• Gravity

• Net force

Answer explanation

Gravity is the force that pulls objects toward each other, such as the Earth pulling us down. Inertia and acceleration describe motion, while net force is the overall force acting on an object, but gravity specifically causes attraction.

Match the following units with their corresponding physical quantities.

• Energy

• Joule

• Mass

• Kilogram

• Length

• Newton

• Force

• Meter

You push a desk right with the force of 120 N and your friend pushes left with the force of 90 N.

What is the net force on the desk.

• 30 N left

• 30 N right

• 210 N right

• 210 N left

• 120 N right, 150 N left

Answer explanation

To find the net force, subtract the left force from the right force: 120 N (right) - 90 N (left) = 30 N (right). Therefore, the net force on the desk is 30 N right.

Which of the following factors affect the force of friction?

• A. The types of surfaces

• B. How hard the surfaces are pushed together

• Both A and B

• C. None of the above

Answer explanation

The force of friction is influenced by the types of surfaces in contact and the normal force, which is how hard the surfaces are pushed together. Therefore, the correct answer is both A and B.

The force that two surfaces exert on each other when they are in contact.

• inertia

• mass

• gravity

• friction

Answer explanation

Friction is the force that two surfaces exert on each other when they are in contact. It opposes the relative motion between the surfaces, making it the correct answer to the question.

Match the following types of friction with their characteristics:

• Friction that occurs when an object moves through a fluid

• Sliding friction

• Friction that occurs when an object rolls over a surface

• Fluid friction

• Friction that occurs when an object is not moving

• Static friction

• Two solid surfaces slide over each other

• Rolling friction

What happens to the gravitational force between two objects when their masses are increased?

• The force increases

• The force decreases

• The force remains the same

• The force becomes zero

Answer explanation

According to Newton's law of universal gravitation, the gravitational force between two objects is directly proportional to the product of their masses. Therefore, increasing their masses results in an increase in the gravitational force.