U1-2 Midterm Science HCAS G5

One example of a contact force is:

• Magnetic force

• Electric force

• Gravity

• Friction

The unit of force is ________.

• kilograms (kg)

• milliliters (mL)

• newtons (N)

• seconds (s)

The closer two objects, the ________ the gravitational force.

• weaker

• stronger

• less

• smaller

In a solution of salt and water, salt is the __________.

• solute

• solvent

• solution

• problem

Newton's first law, the law of inertia, states that...

• Things that aren't moving don't move without a force; things that ARE moving keep moving without another force.

• All teachers must give unicorns to their students after the midterm.

• All living and nonliving things are made of matter.

• All matter is made of atoms.

Newton's second law states that...

• Objects with less density tend to rise.

• Water is the universal solvent.

• F=ma, force is equal to mass times acceleration.

• Water is a polar molecule, so one side is positive and the other is negative.

Newton's third law: when an object exerts a force on another object, the forces are equal in strength and opposite in ___________.

• magnitude

• volume

• condensation

• direction

Temperature is a measure of...

• how big or small an object is.

• the average motion of the particles (how fast they're moving).

• how much space an object takes up.

• how much matter is in an object.

Which of the following is NOT an example of acceleration?

• A car slows down from 70 km/h to 50 km/h.

• A car turns around a corner at 20 km/h.

• A car drives straight at 60 km/h.

• A car speeds up from 30 km/h to 40 km/h.

If the blue player kicks a ball with a force of 75N to the right and the yellow player kicks the same ball with a force of 125N to the left, what is the net force?

• 200N

• 200N to the left

• 50N to the left.

• 50N to the right