IPC Midterm Exam

________ is the force that opposes the sliding motion of two surfaces that are touching each other.

• Gravity

• Static

• Inertia

• Friction

The unit of power is the ________.

• Neurons

• Meters

• Watts

• Joules

What does a negative acceleration mean?

• The object is slowing down.

• The object is speeding up.

• The object is moving at a constant speed.

• The object is not moving.

Acceleration is

• displacement

• velocity

• the rate of change of displacement

• the rate of change of velocity

What is the gravitational potential of a 10-kg sack of groceries on a shelf 1 m above the floor? (HINT: Use 9.8 m/s² for gravity)

• 9.8 J

• 10 J

• 100 J

• 98 J

Which statement about acceleration is TRUE?

• Acceleration always has a positive value.

• A change in direction of motion does not affect an object's acceleration.

• Acceleration can have a positive or negative value.

• If the acceleration is in the same direction as the velocity, acceleration is negative.

________ is a force that opposes the motion of objects that move through the air.

• Air resistance

• Gravity

• Static friction

• Rolling friction

In the absence of air, a penny and a feather dropped from the same height will ______.

• fall at different rates

• fall at the same rates

• not have momentum

• float

Which unit could not be used to describe the distance an object travels?

• kilometer

• mile

• meter

• second

Which unit could not be used to describe the instantaneous speed of an object?

• kilometer per second

• meter per second

• mile per hour

• newton