Matter and motion

Pure substances that cannot be broken down into simpler substances by ordinary chemical means are called

• molecules
• atoms
• elements
• protons

Nicki rides her bike at a constant speed for 5 km. That part of her ride takes her 1 h. She then rides her bike at a constant speed for another 9 km. That part of her trip takes her 1 h. What is her average speed?

• 7.00 km/h

• 5.25 km/h
• 5.00 km/h
• 3.00 km/h

Anything that occupies space and has mass is

• energy.
• matter.
• liquid.
• solid.

The smallest unit of an element that still exhibits the characteristics of that element is called a(n)

• protons
• ion
• electron
• atom

The subatomic particle that has a negative charge is the

• proton
• ion
• electron
• neutron

The three basic states of matter include liquid, solid, and

• air.
• vapor.
• atom.
• gas.

You might have noticed that a feather falls slowly toward the ground, while a ball falls rapidly. Which statement correctly explains the motion of these objects?

• The ball does not experience fluid friction as it falls.
• Gravity is the only force acting on the feather and the ball.
• The acceleration of the ball and feather are the same.
• The feather experiences more fluid friction than the ball.

Marcus is hanging a porch swing on his front porch. The first thing he has to do is attach two springs to the ceiling. Then, he fastens the swing to the springs so that they can stretch and support the weight of the swing. Which two types of potential energy do the springs have?

• elastic
• gravitational
• kinetic
• stretched

What is determined by the distance an object travels and the time it takes to travel that distance?

• direction
• mass
• speed
• force

What element is represented by the diagram?

• arsenic (As)
• nitrogen (N)
• phosphorus (P)
• sulfur (S)