PS Final Fall 2023

Which BEST describes the difference between speed and velocity?

• Velocity is instantaneous

• Speed is a vector quantity

• Velocity includes rate of change and direction

• Speed includes rate of change and direction

Answer explanation

Velocity includes rate of change and direction

An object that is moving must have a change in

• its acceleration

• its speed

• its applied force

• its position

Answer explanation

An object that is moving must have a change in its position.

A girl walks 4 steps forward and then 3 steps backward. The girls distance walked is ____ steps and her displacement is ____ steps.

• 7, 1

• 1, 7

• 3, 4

• 7, 7

Answer explanation

The girl's distance walked is 7 steps, as she walks 4 steps forward and then 3 steps backward. Her displacement is 1 step, as she ends up 1 step forward from her starting point.

The speedometer in a car measures the car's

• instantaneous speed

• forward motion

• average speed

• deceleration

Answer explanation

The speedometer in a car measures the car's instantaneous speed, which is the correct choice.

A truck is traveling at a rate of -2 m/s/s. What is the truck doing?

• speeding up

• going backwards

• flying

• slowing down

Answer explanation

The truck is slowing down because it is traveling at a rate of -2 m/s/s.

What type of energy is shown in the picture?

• Elastic

• Chemical

• Kinetic

Answer explanation

The type of energy shown in the picture is Chemical. Chemical energy is stored in the bonds of molecules and is released during chemical reactions.

What type of energy is shown in the picture?

• Electrical

• Gravitational

• Radiant

Answer explanation

The type of energy shown in the picture is Electrical. It is the energy associated with the flow of electric charge.

What type of energy is shown in the picture?

• Elastic

• Chemical

• Kinetic

Answer explanation

The energy shown in the picture is elastic energy, which is stored in the stretched or compressed object.

What type of energy is shown in the picture?

• Potential

• Elastic

• Hydroelectric

Answer explanation

The picture shows potential energy, which is the correct choice. Potential energy is stored energy that an object possesses due to its position or condition.

What type of energy is shown in the picture?

• Electrical

• Gravitational

• Radiant

Answer explanation

The type of energy shown in the picture is gravitational. Gravitational energy is associated with the force of gravity and is present when an object is raised or lifted against gravity.