physics test 2

A truck hits a fly on the road and exerts a force pointing north on the fly. The fly accelerates a certain amount. What is the magnitude of the acceleration of the truck equal to? A) Less than the acceleration of the fly B) The same as the acceleration of the fly C) More than the acceleration of the fly D) None of these

Less than the acceleration of the fly

Exerting a force on anything in this universe results in an "equal and opposite" force on the object that is exerting the force

Newton's third law of motion states A) An object in motion stays in motion unless acted upon by a net external force B) Fnet=ma C) Exerting a force on anything in this universe results in an "equal and opposite" force on the object that is exerting the force D) The gravitational force between two masses is proportional to each of the masses and inversely proportional to the square of the distance between the masses

kg*m/s^2

Newtons are the units of force in this course. What is a Newton in terms of other units? A) kg*m/s^2 B) kg*m/s C) kg*m D) g*m

A truck hits a fly on the road and exerts a force pointing north (when seen from above) on the fly. What is the direction of the force the fly exerts on the truck? A) North B) East C) South D) West

South

Inertia can be measured with an object's A) Mass B) Weight C) Gravitational acceleration D) Velocity

mass

Newton's second law of motion relates force to which other quantities? A) mass and position B) mass and velocity C) mass and acceleration D) mass only

mass and acceleration

D) all of the above

. An object moving at constant velocity can be described which of the following terms A) at rest B) has a net external force of zero C) has zero acceleration D) all of the above

C) 2 m/s2

A commercial jet has a mass of 5,000 kg and the thrust of its engine is 10,000 N. The acceleration of the jet when taking off is A) 0.5 m/s2 B) 1 m/s2 C) 2 m/s2 D) 4 m/s2

be half

A given net force propels an object along a straight-line path by a force. If the mass were doubled and the force didn't change, its acceleration would A) quadruple B) double C) stay the same D) be half

D) (1/2)a

A given net force, F, pushes an object of mass, m producing an acceleration, a, of the object. In a new situation, the same force, F, pushes a new mass, 2m. What is the new acceleration? A) 4a B) 2a C) a D) (1/2)a

0 N

A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is A) 0 N B) equal to the weight of the puck C) the weight of the puck divided by the mass of the puck D) the mass of the puck multiplied by 10 m/s2

B) 3000 N.

A karate chop breaks a board with a blow of 3000 N. The force that acts on the hand during this event is A) less than 3000 N. B) 3000 N. C) more than 3000 N. D) not enough information

force of the glove on the ball.

A player catches a ball. Consider the force of the ball against the player's glove. The reaction force is the A) player's grip on the glove. B) force of the glove on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms.

even though no force acts on it

A space probe in remote outer space (negligible gravity/other forces) continues moving A) because a force acts on it B) in a curved path C) even though no force acts on it D) due to gravity

D) All of the above

An object in equilibrium A) has a net external force of zero B) has a constant velocity C) has an acceleration of zero D) All of the above

all of the above

An object moving at constant velocity can be described which of the following terms A) at rest B) has a net external force of zero C) has zero acceleration D) all of the above

1st law

An object remains at rest unless acted upon by a net external force is which of Newton's laws? A) 1st law B) 2nd law C) 3rd law D) 4th law

pull of the ball's mass on Earth.

As a ball falls, the force on the ball is the pull of Earth's mass on the ball. The reaction force is the A) air resistance acting against the ball. B) acceleration of the ball. C) pull of the ball's mass on Earth. D) nonexistent.

D) All of these

How an object responds to a force is determined by A) The net external force on an object B) The object's inertia C) The object's mass D) All of these

zero

The force required to maintain an object at a constant velocity in free space is equal to A) zero B) the mass of the object C) the weight of the object D) the force required to stop it

A truck hits a fly on the road and exerts a force pointing north on the fly. What is the magnitude of the force the fly exerts on the truck equal to? A) Less than the force the truck exerts on the fly B) The same as the force the truck exerts on the fly C) More than the force the truck exerts on the fly D) None of these

The same as the force the truck exerts on the fly

. An object has two forces acting on it: a force of 100 N to the right and a force of 80 N to the left. If the object has a mass of 20 kg, what is the direction of acceleration? A) To the left B) To the right C) There is no acceleration D) First to the left and then to the right

To the right

All of the above

What is force? A) A vector B) An interaction between two or more objects C) Something that can be contact or non-contact D) All of the above

An objects resistance to acceleration

What is inertia? A) Motion of objects B) Force on objects C) An objects resistance to acceleration D) Acceleration of objects

Resistance to motion

What is inertia? A) Motion of objects B) Force on objects C) Resistance to motion D) Acceleration of objects