H PHYSICS MIDTERM

They all fall down in the same constant acceleration

A football, a hockey puck, and a tennis ball all fall down in the absence of air resistance. Which of the following is true about their acceleration?

The force on the truck is the same in magnitude as the force on the car

A loaded truck collides with a car causing huge damage to the car.Which of the following is true about the collision?

Arrow pointing to right

A motorbike travels east and begins to slow down before a traffic light. Which of the following is the correct direction of the motorbike's acceleration?

a/5

A net force F accelerates a mass m with an acceleration a. If the same net force is applied to mass 5m, then the acceleration will be

a/2

A net force F acts on a mass m and produces an acceleration a. What acceleration results if a net force 3F acts on a mass 6m?

The bus slows down

A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication of?

The bus speeds up

A passenger standing in a moving bus, facing forward, suddenly falls backward. This can be an indication of?

The bus turns to the left

A passenger standing in a moving bus, facing forward, suddenly falls to the right. This can be an indication of?

Arrow pointing to right

A race car moving west begins to slow down after crossing a finish line. Which of the following is the correct direction of the car's acceleration?

Car 3

A snapshot of three racing cars is shown on the diagram. All three cars start the race at the same time, at the same place and move along a straight track. As they approach the finish line, which car has the lowest average speed?

mgh

A spacecraft moves around Earth in a circular orbit with a constant radius. How much work is done by the gravitational force on the spacecraft during one revolution?

No applied force is required to maintain a constant velocity

A spacecraft travels at a constant velocity in empty space far away from any center of gravity. Which of the following about the force applied on the spacecraft is true?

2 m/s

A toy car moves 8m in 4s at the constant velocity. What is the car's velocity?

3 h

A train moves at a constant velocity of 50 km/h in still water. How long will it take for the boat to move 24 km?

25 km

A train moves at a constant velocity of 50 km/h. How far will it move in 0.5 h?

Zero

A truck driver is trying to push a loaded truck with an applied force. Unfortunately, his attempt was unsuccessful. The truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

Arrow pointing to right

A truck travels east with an increasing velocity. Which of the following is the correct direction of the truck's acceleration?

Be of magnitude F and the opposite direction

If you exert a force F on an object which has a much greater mass than you do, the force with the object exerts on you will

Zero

In order for a rocket ship in deep space, far from any other objects, to move in a straight line with constant speed, it must exert a net force that is

Move with constant velocity

In the absence of a net force, a moving object will

3 km west

What is the net displacement of the car from the initial point?

3rd law

When a baseball is struck by a bat, the force of the bat on the ball is equal and opposite to the force of the ball on the bat. This is an example of newton's

Zero

When a cat sleeps on a table, the net force is

Move with constant velocity

When the engines on a rocket ship in deep space, far from any other objects, are turned off, it will

First law

Which Newton's law can explain the following statement that we often see on the highway display "Buckle up, its the state law"?

Velocity

Which is a vector quality?

Velocity and acceleration both pointing downward

Which of the following is true about the direction the ball's velocity and acceleration between B and C?

Multiply 2 to everything 2Xf=at^2 Divide by t^2 2Xf/t^2=a

Xf=Xo+Vot+1/2at^2 Solve for a

Multiply 2 to everything 2Xf=at^2 Divide by a 2Xf/a=t^2 Add square root

Xf=Xo+Vot+1/2at^2 Solve for t

Never act on the same object

Newton's third law refers to "action-reaction forces". These forces always occur in pairs and

d=st

S=d/t Solve for d

t=s/d

S=d/t Solve for t

-400 J

A container with a mass of 5kg is lifted to a height of 8m. How much work is done by the gravitational force?

9s

A bicyclist moves at a constant speed of 4m/s. How long will it take for the bicyclist to move 36m?

Zero

A block of mass m is moved over a distance d. An applied force F is directed perpendicularly to the block's displacement. How much work is done by the force F?

-Fd

A block of mass m is moved over a distance d. An applied force F is opposite to the block's displacement. How much work is done on the block by the Force F?

Fd

A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement. How much work is done on the block by the force F?

The net force is zero

A boy rides a bicycle at a constant velocity. Which of the following about the net force is true?

Zero

A construction worker holds a heavy tool box. How much work is done by the worker?

Zero

A container wiht a mass of 5kg is lifted to a height of 8m. How much work is done by the external force?

w/m=g

w=mg Solve for g

w/g=m

w=mg Solve for m

Subtract Vo to both sides Vf-Vo=at Divide by a Vf-Vo/a=t

Vf=Vo+at Solve for t

Add square root to everything

Vf^2=Vo^2+2a(Xf-Xo) Solve for Vf

Get rid of Vo and Xo because they'll most likely by zero Vf^2=2aXf Divide by 2a Vf^2/2a=Xf

Vf^2=Vo^2+2a(Xf-Xo) Solve for Xf

Zero

A container with a mass of 5kg is lifted to a height of 8m and then returned back to the ground level. How much work is done by the gravitational force?

Work is positive on the way up, work is negative on the way down

An object is thrown straight up, Which of the following is true about the sign of work done by the gravitational force while the object moves up and then down?

Moves 6 meters every second

An object moves at a constant 6 m/s. This means that the object

The object's velocity increases every 5m/s every second

An object moves with a constant acceleration of 5m/s2. Which of the following statements is true?

F/m=a

F=ma Solve for a

F/a=m

F=ma Solve for m

Increased

If a book on the dashboard of your car suddenly flies towards you, the forward velocity of the car must have

11km

Starting from the origin, a car travels 4km east and then 7km west. What is the traveled distance of the car from the initial point?

9km east

Starting from the origin, a person walks 6km east during first day, and 3km east the next day. What is the net displacement of the person from the initial point in two days?

Its mass

The acceleration of an object is proportional to

36m

The graph represents the relationships between velocity and time for an object moving in a straight line. What is the traveled distance of the object at 9s?

Subtract Vo to both sides Vf-Vo=at Divide by t Vf-Vo/t=a

Vf=Vo+at Solve for a