Newton's 1st Law
How much force is required to keep a 2-kg object moving to the right with a constant speed of 6.0 m/s?
a. 0 N b. 0.33 N
c. 3.0 N d. 12.0 N
a. 0 N
Which one of the following must be true if the forces on an object are balanced?
a. There is no friction acting upon the object.
b. Gravity is the only force acting upon the object.
c. Oppositely directed forces are equal in magnitude.
d. All the forces acting upon the object are equal to one another.
c. Oppositely directed forces are equal in magnitude.
In baseball, the baseball strikes the catcher's mitt and is stopped due to the marvels of Newton's third law. Identify the two letters corresponding to the action-reaction FORCE pairs that are responsible for the stopping of the baseball. Select two letters.
a. The ball pushes upon itself.
b. The ball slows down as the mitt closes upon it.
c. The catcher's mitt pushes backward upon the ball.
d. There is a downward pull of the Earth upon the ball.
e. The ball applies a forward force to the catcher's mitt.
c. The catcher's mitt pushes backward upon the ball.
e. The ball applies a forward force to the catcher's mitt.
The mass of an object is the force of gravity acting upon an object.
a. True b. False
b. False
Consider the following situation:
A person is standing on the ground.
Identify which of the listed forces are exerted upon the object. Select all that apply.
a. Force of gravity b. Normal force
c. Friction force d. Tension force
e. Spring force
a. Force of gravity b. Normal force
Which of the following can be explained using Newton’s first law of motion?
a. It explains why a stationary object remains stationary.
b. It explains why every force is accompanied by a reaction force.
c. It explains why an object accelerates with a particular acceleration value.
a. It explains why a stationary object remains stationary.
Which one of the following must be true if an object is experiencing a net force?
a. There is no friction acting upon the object.
b. Gravity is the only force acting upon the object.
c. Oppositely directed forces are equal in magnitude.
d. All the forces acting upon the object are equal to one another.
b. Gravity is the only force acting upon the object.
A small car is at rest at a stoplight. A large truck rear-ends the small car. Why is the force experienced by the truck greater than the force experienced by the car?
a. The truck has more mass; the more massive object experiences the greater force.
b. The truck is moving; the object with the greatest speed experiences the greater force.
c. Nonsense! The car actually experiences a greater force than the truck.
d. Nonsense! Both the car and the truck experience the same amount of force.
d. Nonsense! Both the car and the truck experience the same amount of force.
The force of gravity that acts upon an object is referred to as the _____ of the object.
a. pressure b. weight
c. mass d. kilograms
e. inertia
b. weight
A skydiver pulls the chord of his parachute. The skydiver is experiencing 2000 N of Air Resistance and 1000 N of Gravity. You can assume that ____.
a. The skydiver will immediately stop.
b. The skydiver will begin moving upwards.
c. The skydiver will continue to fall, but now will slow down.
d. None of these will occur
c. The skydiver will continue to fall, but now will slow down.
Question 8:
Which one of the following statements is true of an object that is at rest?
a. There are no forces acting upon the object.
b. There is no gravity acting upon the object.
c. The individual forces acting upon the object are balanced.
d. The individual forces acting upon the object are NOT balanced.
c. The individual forces acting upon the object are balanced.
Consider the following situation:
A leftward moving car is skidding to a stop.
Identify which of the listed forces are exerted upon the object. Select all that apply.
a. Force of gravity b. Normal force
c. Friction force d. Tension force
e. Spring force
a. Force of gravity b. Normal force
c. Friction force
A rightward force of 30.0 N is applied to a 5.0-kg object to accelerate it across a horizontal surface. The object encounters 10.0 N of friction. What is the object's acceleration?
a. 2.0 m/s/s b. 4.0 m/s/s
c. 6.0 m/s/s d. 8.0 m/s/s
b. 4.0 m/s/s
The mass and weight of an object are the same thing.
a. TRUE b. FALSE
FALSE
The acceleration of an object is ______ proportional to the net force and ______ proportional to its mass. Choose the two words that fill in the blanks in their respective order.
a. directly, directly b. inversely, inversely
c. directly, inversely d. inversely, directly
c. directly, inversely
The individual forces acting upon an object are balanced. What can be concluded about the object’s motion?
a. The object is not moving.
b. The object is slowing down.
c. The object is not accelerating.
c. The object is not accelerating.
Consider the following situation:
A book is at rest upon the table.
Identify which of the listed forces are exerted upon the object. Select all that apply.
a. Force of gravity b. Normal force
c. Friction force d. Tension force
e. Applied force
a. Force of gravity b. Normal force
A rightward force of 24.0 N is applied to a 2.0-kg object to accelerate it across a horizontal surface. The object encounters 16.0 N of friction. What is the object's acceleration?
a. 4.0 m/s/s b. 8.0 m/s/s
c. 12.0 m/s/s d. 20.0 m/s/s
e. None of these are correct.
a. 4.0 m/s/s
The following statements were made about a 1-kilogram object. Which one is INCORRECT?
a. The object weighs 9.8 Newton.
b. The object has a mass of 1 kilogram.
c. The force of gravity on the object is 1 kilogram.
c. The force of gravity on the object is 1 kilogram.
The net force experienced by an object is increased. What affect does this have on the acceleration of the object?
a. The acceleration is increased.
b. The acceleration is decreased.
c. The acceleration is not affected by this change.
a. The acceleration is increased.
An elevator is supported by a cable and moving upward through the elevator shaft at a constant speed. How does the upward tension force compare to the downward force of gravity?
a. The upward tension force is stronger than the downward force of gravity.
b. The downward force of gravity is stronger than the upward tension force.
c. The tension force and the force of gravity are of equal strength.
c. The tension force and the force of gravity are of equal strength.
Consider the following situation:
A force is exerted to push an object to the right at constant speed
Identify which of the listed forces are exerted upon the object. Select all that apply.
a. Force of gravity b. Normal force
c. Friction force d. Tension force
e. Applied force
a. Force of gravity b. Normal force
c. Friction force
e. Applied force
A sprinter in track is able to progress towards the finish line due to the marvels of Newton's third law. Identify the two letters corresponding to the action-reaction FORCE pairs that are responsible for this running action. Select two letters.
a. The ground pushes forward upon the sprinter's shoes.
b. The sprinter pushes backward upon the ground with her shoes.
c. The force of gravity pulls the sprinter towards the track surface.
d. The ground pushes upward upon the sprinter and reduces her weight.
e. The left leg moves forward as the right leg moves backward; and vice versa.
a. The ground pushes forward upon the sprinter's shoes.
b. The sprinter pushes backward upon the ground with her shoes.
There is more gravity on earth than the moon. True or False?
True
An object has an acceleration of 12.0 m/s/s. The net force acting on the object is doubled while the mass of the object is held constant. What will be the new acceleration?
a. 2.0 m/s/s b. 6.0 m/s/s
c. 14.0 m/s/s d. 24.0 m/s/s
d. 24.0 m/s/s