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?

50 m/s
25 m/s**
10 m/s
100 m/s

Which example identifies a change in motion that produces acceleration?

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

When an unbalanced force acts on an object,

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

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

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

Projectile motion is caused by

the downward force of gravity.***
the initial forward velocity.
a final vertical velocity.
the downward force of gravity and an initial forward velocity.

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