# Physical Science

A distance-time graph indicates than an object moves 100 m in 4 s and then remains at rest for 6 s. What is the average speed of the object?

A.
50 m/s
B.
25 m/s**
C.
10 m/s
D.
100 m/s

Which example identifies a change in motion that produces acceleration?

A.
a speed skater moving at a constant speed on a straight track
B.
a ball moving at a constant speed around a circular track
C.
a particle moving in a vacuum at a constant velocity
D.
a vehicle moving down the street at a steady speed***

When an unbalanced force acts on an object,

A.
the object’s motion does not change.****
B.
the object accelerates.
C.
the weight of the object decreases.
D.
the inertia of the object increases.

As you push a cereal box across a tabletop, the sliding friction acting on the cereal box

A.
acts in the direction of motion.***
B.
equals the weight of the box.
C.
is usually greater than static friction.
D.
acts in the direction opposite of motion

Projectile motion is caused by

A.
the downward force of gravity.***
B.
the initial forward velocity.
C.
a final vertical velocity.
D.
the downward force of gravity and an initial forward velocity.

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