Forces Test Multiple Choice
The law of interia applies to
Both moving and nonmoving objects -An object's resistance to acceleration when a nonzero net force is exerted
A high school student hits a nail with a hammer. During the collision, there is a force
on the nail, and also the hammer
if surface area increases what happens to friction
the friction will increase
A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s2. The acceleration of a mass of 6 kg acted upon by a force of 6 N is
the same
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is
the same
After a cannonball is fired into frictionless space,e the amount of forced needed to keep it going equals
zero since no force is necessary to keep it moving
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
1o Times as much as the force on the 1-kg blook
A bag of sports equipment has a mass of 10.0 kg and a weight of
98 N
A box is being pushed by a constant force along a horizontal surface. If the object's velocity is constant, we can infer that there is ____ acting on the box
Frictional force
Which of the following is an example of a force which acts as a distance?
Gravity
if a book on the dashboard of your car suddenly flies towards you, the forward velocity of the car must have
Increased
If the force acting on a cart doubles, what happens to the carts acceleration?
It doubles
Compared to its weight on Earth, an 10-kg object on the moon will weigh
Less
Why is it so much more difficult to get a heavy table to start moving, than it is to keep it moving?
MS is greater than MK
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight, you would weigh
More
Newtons 3rd law refers to action-reaction forces. Theres forces always occur in pairs and
Never act on the same object
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 spacecraft is true?
No applied force is required to maintain a constant velocity.
The acceleration due to gravity is higher on Jupiter than on Earth. The mass and weight of a rock on Jupiter compared to that on Earth would be
Same, more
Which force is directly responsible for your ability to walk and stop
Static
A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s2. What is the mass of the car?
2000 kg
Supposed the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is
25 N
You pull horizonatally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. What is the acceleration?
4 m/s2
An apple weighs 1 N. The net force on the apple when it is in free fall is
1 N
Friction
-comes from microscopic bumps that act as obstructions to the object's motion -is the name given to the force acting between surfaces sliding past one another -acts in a direction that opposes motion of an object
The acceleration produced by a net force on an object is
-inversely proportional to the mass of the object -directly proportional to the magnitude of the net force -in the same direction as the net force
The mass of a lamb that weights 110 N is about
11 kg
A ball is thrown straight up. At the top of its path, the magnitude of the net force acting on it is
Equal to mg.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?
The force of the ball against the bat.
A loaded truck collides with a car causing huge damage to the car. Which of the following is true?
The force of the truck is the same in magnitude as the force of the car
A player catches a ball. Consider the action force to be the impact of the ball against the players glove. What is the reaction to this force?
The force the glove exerts on the ball
Earth pulls downward on a pen, of mass m, which is sitting on a table; the magnitude of the force is mg. If that is called the action force, what is the reaction force?
The pen pulling upward on Earth with a force equal to mg.
If a horse pulls a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?
Yes because there is a net force acting on the wagon
The force to maintain an object at constant speed in free space is equal to
Zero
in order for a rocket ship in deep space, far from other objects, to move in a straight line with constant speed, it must exert a net force that is
Zero
A net force F acts on a mass m and produces a acceleration a. What acceleration results if a net force 3F acts on mass 6m?
a/2
