AP Physics Work

Which are correct units for work?

• N x s

• N x m

• J/s

• W

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

is it possible for forces to act on an object and still have a net force of zero?

• yes

• no

• depends on the type of force

Whenever work is done, energy changes

• Law of Conservation of Energy

• Work-Energy Theorem

• Newton's Fourth Law

• Efficiency

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The force used in the work equation has to always be acting in the same direction as the movement of the object.

• True

• False

Tags

NGSS.MS-PS2-1

Moving the car by the diagonal route uses 20 000J and lifting the car vertically uses 24 000J of energy. If both routes take the same time, (10 s) which route uses more power?

• Vertical one less energy is used per second

• Diagonal one as less energy is used per second

• Vertical one as more energy is used per second

• Diagonal one as more energy is used per second

Tags

NGSS.MS-PS3-5

On another day Bob does 30 000J of work riding up the slope and gaines 28 000J in E_p. If it takes the same amount of time 20 seconds to get to the top calculate the power he uses for both routes.

• 1400J and 1300J

• 1400J and 2000J

• 1400J and 1500J

• 14000J and 15000J

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-2

Winnie and Eeyore have the same mass and have just finished climbing the same tree, but Eeyore was 4 seconds faster then Winnie. Who used the most power?

• Winnie as he took the longer time and did the same amount of work as Eeyore

• Winnie as he is shorter and could grip more as so did more work overall

• Eeyore as he did the same amount of work as Winnie but in a shorter time.

• Eeyore as he did more work than Winnie but in a shorter time

How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?

• 3.8 m

• 3.7 m

• 3.2 m

• 3.6 m

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Is this an example of work? 
A book falls off a table and free falls to the ground.

• True

• False

Tags

NGSS.MS-PS3-5

Is this an example of work? 
A rocket accelerates through space.

• True

• False

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5