Newtons Laws
Which of the following best describes Newton's First Law of Motion?
A) An object in motion stays in motion unless acted upon by an external force.
B) Force equals mass times acceleration.
C) For every action, there is an equal and opposite reaction.
A) An object in motion stays in motion unless acted upon by an external force.
A box is pushed to the right with a force of 10 N and pulled to the left with a force of 4 N. What is the net force on the box?
A) 14 N to the right
B) 4 N to the left
C) 6 N to the right
C) 6 N to the right
What is friction?
A) A force that opposes motion between two surfaces in contact
B) A force that acts only on moving objects in the air
C) A force that pulls objects together
A) A force that opposes motion between two surfaces in contact
What is work in physics?
A) The force applied times the distance over which it acts in the direction of the force
B) The energy lost due to friction
C) The speed of an object times its mass
A) The force applied times the distance over which it acts in the direction of the force
What causes static electricity?
A) The flow of electric current through a wire
B) The movement of magnets near metal
C) The buildup of electric charge on the surface of an object
C) The buildup of electric charge on the surface of an object
Newton's Second Law states that the acceleration of an object is:
A) Proportional to its mass and inversely proportional to the force applied.
B) Proportional to the force applied and inversely proportional to its mass.
C) Equal to the force multiplied by the mass.
B) Proportional to the force applied and inversely proportional to its mass.
If an object experiences zero net force in one dimension, what happens to its velocity?
A) It speeds up.
B) It slows down.
C) It stays constant.
C) It stays constant.
Which type of friction acts on objects that are not moving relative to each other?
A) Kinetic friction
B) Static friction
C) Rolling friction
B) Static friction
If you push a box across the floor with a force of 20 N for a distance of 5 meters, how much work do you do?
A) 4 J
B) 25 J
C) 100 J
C) 100 J
When you rub a balloon on your hair and it sticks to a wall, what type of charge interaction is happening?
A) Opposite charges attract
B) Like charges repel
C) Magnetic forces attract
A) Opposite charges attract
If no net force acts on an object, what will happen according to Newton's First Law?
A) The object will start moving.
B) The object will slow down.
C) The object will maintain its current state of motion.
C) The object will maintain its current state of motion.
A 5 kg object accelerates at 2 m/s² in one direction. What is the magnitude of the net force acting on it?
A) 10 N
B) 2.5 N
C) 7 N
A) 10 N
If you push a box across the floor with a constant force and it moves at a constant speed, what can be said about the frictional force?
A) It is zero
B) It is greater than the push force
C) It is equal in magnitude and opposite in direction to the push force
C) It is equal in magnitude and opposite in direction to the push force
Which of the following is a form of energy that an object possesses due to its motion?
A) Potential energy
B) Kinetic energy
C) Thermal energy
B) Kinetic energy
Which material is most likely to gain electrons and become negatively charged when rubbed against wool?
A) Glass
B) Rubber
C) Silk
B) Rubber
According to Newton's Third Law, when you push against a wall, the wall:
A) Does not exert any force back.
B) Pushes back with an equal and opposite force.
C) Pushes back with less force than you apply.
B) Pushes back with an equal and opposite force.
If two forces act on an object in opposite directions with equal magnitude, what is the net force?
A) Equal to the sum of both forces
B) Zero
C) Equal to one of the forces
B) Zero
Which of the following statements about gravity is true?
A) Gravity only acts on objects that are moving.
B) Gravity pulls objects toward each other with a force that depends on their masses and distance.
C) Gravity pushes objects away from the Earth.
B) Gravity pulls objects toward each other with a force that depends on their masses and distance.
Which of the following is an example of a simple machine?
A) Lever
B) Motor
C) Bicycle
A) Lever
Who is the best Physics teacher?
a) Mr. Smith
b)Miss. W
c) Elmo
c)elmo
Just Kidding ... b) Miss. W
Which equation correctly represents Newton’s Second Law?
A) F = m x a
B) F = m + a
C) F = m – a
A) F = m x a
An object is initially at rest. A constant force is applied in one direction. What will happen to the object’s motion?
A) It will remain at rest.
B) It will move with constant speed.
C) It will accelerate in the direction of the force.
C) It will accelerate in the direction of the force.
What causes objects to fall toward the Earth?
A) Magnetic force
B) Gravity
C) Friction
B) Gravity
How do simple machines help us do work?
A) By increasing the amount of work done
B) By changing the direction or amount of force needed to do work
C) By eliminating friction completely
B) By changing the direction or amount of force needed to do work
When is the last day of school?
a) June 21st
b) June 12th
c) June 17th
b) June 12th