APP1 1st semester review

The slope of the curve in the position vs. time graph for a particle’s motion gives

• the particle’s speed.

• the particle’s acceleration.

• the particle’s average velocity.

• the particle’s instantaneous velocity.

Is it possible for an object’s instantaneous velocity and instantaneous acceleration to be of opposite sign at some instant of time?

• yes

• no

• more information needed

Without air resistance, an object dropped from a plane flying at constant speed in a straight line will

• quickly lag behind the plane.

• remain vertically under the plane

• move ahead of the plane

A ball is thrown downward (not dropped) from the top of a tower. After being released, its downward acceleration will be

• greater than g.

• exactly g

• smaller than g

Which of these laws is not one of Newton’s laws?

• Action is reaction

• F = ma

• All objects fall with equal acceleration.

• Objects at rest stay at rest, etc.

The law of inertia

• expresses the tendency of bodies to maintain their state of motion.

• is Newton’s 3rd law.

• states force is proportional to acceleration.

Astronauts on the Moon can jump so high because

• they weigh less there than they do on Earth.

• their mass is less there than it is on Earth.

• there is no atmosphere on the Moon.

Is the normal force on a body always equal to its weight?

• yes

• no

A person holds a bowling ball in a fixed position. The work she does on the ball

• depends on the weight of the ball.

• cannot be calculated without more information.

• is equal to zero.

A very heavy load is pushed across a horizontal floor. The work done by gravity on the load

• depends on the weight of the load.

• cannot be calculated without more information.

• is equal to zero.