Chap 4 - Physics

Which varies with location, mass or weight?

In the string-pull illustration in Figure 4.8, a gradual pull of the lower string results in the top string breaking. Does this occur because of the ball's weight or its mass?

In the string-pull illustration in Figure 4.8, a sharp jerk on the bottom string results in the bottom string breaking. Does this occur because of the ball's weight or its mass?

State Newton's second law of motion.

How does acceleration depend on the net force?

When you push horizontally on a crate that doesn't slide on a level floor, how great is the force of friction on the crate?

As you increase your push on a stationary crate, will friction on the crate increase also?

Once the crate is sliding, how hard do you push to keep it moving at constant velocity?

Which is normally greater: static friction or sliding friction on the same object?

How does the force of friction for a sliding object vary with speed?

Does fluid friction vary with speed?

Shake something to and fro and you're measuring its what? Lift it against gravity and you're measuring its what?

Fill in the blanks: The Standard International unit for mass is _____. The Standard International unit for force is _____.

What is the approximate weight of a quarter-pound hamburger after it is cooked?

What is the weight of a 1-kilogram brick resting on a table?

How does acceleration depend on mass?

Give an example of what it means to say mass and weight are proportional to each other?

If the net force acting on a sliding block is somehow tripled, what happens to the acceleration?

If the mass of a sliding block is tripled while a constant net force is applied, by how much does the acceleration change?

If the mass of a sliding block is somehow tripled at the same time the net force on it is tripled, how does the resulting acceleration compare with the original acceleration?

How does the direction of acceleration compare with the direction of the net force that produces it?

What is the condition for an object experiencing free fall?

The ratio circumference/diameter for all circles is π. What is the ratio force/mass for freely falling bodies?

Why doesn't a heavy object accelerate more than a light object when both are freely falling?

What is the net force that acts on a 1-kg freely falling object?

What is the net force that acts on a 10-N falling object when it encounters 4 N of air resistance? When it encounters10 N of air resistance?

What two principal factors affect the force of air resistance on a falling object?

What is the acceleration of a falling object that has reached its terminal velocity?

Why does a heavy parachutist fall faster than a lighter parachutist who wears a parachute of the same size?

If two objects of the same size move through the air at different speeds, which encounters the greater air resistance?