Science help.?

Question

2. Compare the force of air resistance and the force of

gravity on an object falling at its terminal velocity.

3. Compare the size of forces due to static, sliding, and

rolling friction between two surfaces.

4. Think Critically What is the net force on a car stopped

at a stop sign? What is the net force on a car moving in

a straight line with a constant speed?

5. Calculate Net Force Two students push on a box in the

same direction, and another pushes on the box in the

opposite direction. What is the net force on the box if

each pushes with a force of 50 N?

7. Calculate Acceleration The downward force of

gravity and the upward force of air resistance on

a falling ball are both 5 N. What is the ball’s

acceleration?

THNX :]

Answer 1

2. Compare the force of air resistance and the force of

gravity on an object falling at its terminal velocity.

they are equal

3. Compare the size of forces due to static, sliding, and

rolling friction between two surfaces.

depends on the surfaces. static is usually highest, rolling is usually lowest

4. Think Critically What is the net force on a car stopped

at a stop sign? What is the net force on a car moving in

a straight line with a constant speed?

zero, zero

5. Calculate Net Force Two students push on a box in the

same direction, and another pushes on the box in the

opposite direction. What is the net force on the box if

each pushes with a force of 50 N?

Each of the three pushes with 50N? then net is

50.

+50+50-50 = 50

7. Calculate Acceleration The downward force of

gravity and the upward force of air resistance on

a falling ball are both 5 N. What is the ball’s

acceleration?

zero