Physics Quiz

Define work.

• Rate of doing work.

• The product of force and distance.

• A device that changes force.

• • The number of times a machine increases an input force.

What are the necessary conditions for work to be done? Mark all that apply.

• Some of the acting force must be in the same direction as the object is moving.

• The object must be moving.

• All of the acting force must be in the same direction as the object is moving.

• The object must not be moving.

What is the definition of the joule?

• 1 W = 1 J/s = 1 J / 1 s

• 1 W = 1 J/s = 1 J / 1 m

• 1 J = 1 N * 1 m = 1 N * m

• 1 J = 1 m * 1 m = 1 N * m

Tags

NGSS.HS-PS2-1

Define power.

• The product of force and distance.

•  A device that changes force.

• • The number of times a machine increases an input force.

• Rate of doing work.

What is the definition of the watt?

• 1 J = 1 N * 1 m = 1 N * m

• 1 W = 1 J/s = 1 J / 1 s

• 1 J = 1 n * 1 m = 1 N * m

• 1 W = 1 J/s = 1 J / 1 m

How can you increase power output?

• You can do more work in a given amount of time, or do the same amount of work in more time.

• You can do less work in a given amount of time, or do the same amount of work in less time.

• You can do more work in a given amount of time, or do the same amount of work in less time.

• You can do less work in a given amount of time, or do the same amount of work in more time.

How do we define horsepower?

• 1 horsepower is equivalent to the power output of a strong horse. (It’s approximately 755.7 W.)

• 1 horsepower is equivalent to the power output of a strong horse. (It’s approximately 745.7 W.)

• 1 horsepower is equivalent to the power output of a strong horse. (It’s approximately 745.7 S.)

• 1 horsepower is equivalent to the power output of a strong horse. (It’s approximately 754.7 W.)

Define machine. **

• A thing that changes distance traveled

• An apparatus using or applying mechanical power and having several parts, each with a definite function and together performing a particular task.

• An object that makes lives easier

• A device that changes force.

Tags

NGSS.MS-PS2-1

How do machines make doing work easier?

• It can change the distance that a force needs to travel through.

• It can change the size of the force needed.

• It can change the size of the force needed, change the distance that a force needs to travel through, or change the direction that a force is applied.

• It can change the direction that a force is applied.

Tags

NGSS.MS-ETS1-1

How are work input and work output related for a machine, and why?

• The work output of a machine is strictly less than the work input of a machine because of friction.

• The work output of a machine is strictly more than the work input of a machine because of friction.

• The work output of a machine is strictly less than the work input of a machine because of movement.

• The work input of a machine is strictly less than the work output of a machine because of friction.