Phys Final

The final displacement of the stone is negative.

A stone is thrown upward from atop a cliff and then lands at the base of the cliff. Which statement is true if the upward direction is considered positive?

-9.8 m/s^2

A stone is tossed upward at +9.80 m/s. What is its acceleration at the top of its rise?

4.9 m

A stone is tossed upward at +9.80 m/s. What is its displacement after one second?

0 m/s

A stone is tossed upward at +9.80 m/s. What is its velocity after one second?

0 m/s

A stone is tossed upward at +9.80 m/s. What is its velocity at the top of its rise?

The feathers and bricks strike the ground simultaneously.

A ton of feathers and a ton of bricks are dropped from the same height on the moon. What happens?

A constant unbalanced backward force.

If an object is moving forward at a constant velocity and is TO BE decelerated at a constant rate, what kind of force is needed?

The change in momentum could occur in a short period of time, requiring a large applied force.

In a 30 mph collision, a 10 lb child can exert a 300 lb force against a parent's grip. How is this possible?

The object is accelerating at 2 m/s^2.

The velocity graph of an ovject's motion has a slope of +2. What does this indicate?

The steel ball has more mass but also weighs more.

The reason a tennis ball and a steel ball of the same volume will accelerate downward at the same rate is that...

6 Newtons east

Three forces act simultaneously on an object. The first is a 5 Newton force acting due east, the second is a 3 Newton force acting due west, and the third is a 4 Newton force acting due east. What is the resultant force?

remains zero throughout

Two gliders having the same mass and equal but opposite velocities move toward eachother on an air track and bounce. In this collision, the total combined momentum of the gliders

The distance the stone travels.

V is standing on top of the roof of his house, firing stones with his slingshot over a level field. He is aiming straight outward, horizontally. If V pulls back harder on the sling to shoot a stone, which of the following quantities will be changed?

constant acceleration

A constant unbalanced force on an object with a constant mass will produce...

Riding down to the shipping dock on a conveyor belt tilted at 45 degrees to the ground

A crate makes a journey through a factory. During which of the following parts of its journey is the magnitude of the frictional force acting on the crate the highest?

moving at a constant speed of 5 m/s

An object is observed and a graph of its distance versus time is constructed. The graph has a slope of +5.00 when the distance is measured in meters and the time is measured in seconds. The object was...

less inertia

Compared to an identical 10 kg object on the earth, a 10 kg object on the moon would have

velocity

Neglecting air resistance, when an object is thrown straight up, which of the following quantities is NOT the same on the way down as the way up?

Inertia

What must be overcome to throw an object horizontally.

The velocity is zero.

When an object that was thrown upward reaches its highest point, which statement is true?

Velocity

Which of the following quantities is a vector that changes signs when an object that was thrown upward stops rising and begins to fall?

surface area

Which of the following will not, when altered, change the value of a frictional force?

in V's arms.

While riding at a constant speed on a train, V playfully tossed his dog straight upward. During the time his dog was in the air, the train moved forward one meter. The dog landed

constant and the time is increased, so the force is increased.

You are jumping off a wall and choose to bend your knees as you land. You did this because the change in momentum is