Theoretical Physics test-exam

In air, a piece of paper falls slower than a steel ball because of:

• The mass of the steel ball is larger than the mass of the piece of paper.

• The weight of the steel ball is larger than the weight of the piece of paper.

• Air resistance.

• None of the following

The average acceleration is:

• The magnitude of the instantaneous velocity.

• The magnitude of the instantaneous acceleration.

• The change of position divided by the time elapsed.

• None of the following.

Tags

NGSS.HS-PS2-1

The instantaneous velocity is defined as the average velocity evaluated for:

• A given time interval.

• A given displacement.

• An extremely short time interval.

• None of the above.

Which of the following are vector quantities?

• acceleration, velocity, displacement, force

• temperature, speed, energy, force

• velocity, speed, distance

• none of the above

Which of the following statements is correct?

• A scalar is defined by its magnitude and its direction

• The magnitude of a vector is always positive

• A vector is defined by a number and a unit

• A scalar is always positive

Two opposite vectors:

• have the same direction but different magnitudes

• have the same magnitude and direction

• have the same magnitude but opposite directions

• have the same magnitude but different directions

A person walks 1 km due north and then 1 km due south. Which of the following statements is correct?

• He travels a distance of 1 km

• His displacement is equal to zero

• The traveled distance is zero

• both a and b

An object is moving with constant velocity in a straight line. Which of the following statements is true?

• The net force on the object is zero

• A constant force is being applied in the direction of motion

• There are no forces acting on the object.

• There is no frictional force acting on the object.

Tags

NGSS.HS-PS2-1

If you exert a force F on an object, the force which the object exerts on you will

• depend on your mass.

• depend on whether or not the object is moving.

• always be:– F

• depend on whether or not you are moving.

Tags

NGSS.HS-PS2-1

What does the word "normal" mean in the phrase "normal force"?

• the component of the force exerted by a surface parallel to the surface

• the force is due to contact between two objects.

• the force that is usually exerted by a surface

• the component of the force exerted by a surface perpendicular to the surface

• the total force exerted by a surface