PS Ch 3 Test Review

How is the energy of an object affected after work is done on it?

• Energy is increased.

• Energy is decreased.

• Energy remains the same.

• Energy increases and decreases.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

NGSS.MS-PS3-1

Which machine works by changing the direction of a force?

• a rake

• a pulley

• a screwdriver

• a broom

Which statement describes the relationship between input work and output work using a machine?

• Input work is always equal to output work.

• Input work is always less than output work.

• Input work is always greater than output work.

• None of the above.

Which distance do you measure to determine how much work was done on an object that has been moved?

• vertical distance

• horizontal distance

• all distance against gravity

• distance in the direction of motion

A rake makes doing work easier by changing the __________________________.

• size of the force

• distance a force acts

• Amount of work required

• direction of the force

Which factor always causes the output work of a machine to be less than the input work?

• gravity

• fatigue

• friction

• distance

Which two factors are used to calculate work?

• speed and time

• force and speed

• time and distance

• distance and force

Which option is NOT a way that machines can make work easier?

• Increase the total energy.

• Change the size of a force.

• Change the direction of a force.

• Increase the distance a force acts.

Lifting an object in the air increases the __________ energy of the object.

• kinetic

• It does not increase the energy.

• kinetic and potential

• potential

Tags

NGSS.MS-PS3-2

Which equation is used to calculate power?

• work x time

• force x distance

• weight/force

• work/time