Work and work energy Theorem

A constant force of 12 N in the positive x direction acts on a 4.0-kg object as it moves from the origin to the point (6i -8j) m. How much work is done by the given force during this displacement?

• +60 J

• +84 J

• +72 J

• +48 J

• +57 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?

• +294 J

• -294 J

• +30 J

• -30 J

• -50 J

Tags

NGSS.HS-PS2-4

When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is

• 0

• -mgh

• +mgh

• -2mgh

• +2mgh

Tags

NGSS.HS-PS2-4

The net force on an object is represented in the

force-position graph shown below. Find the work

done on the object as it moves from x = –40 m to x =

40 m.

• 90 J

• 60 J

• 40 J

• 30 J

• 20 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS2-1

A student pushes a box across a rough horizontal floor. If the amount of work done by the student on the box is 100 J and the amount of energy dissipated by friction is 40 J, what is the change in kinetic energy of the box?

• 0 J

• 40 J

• 60 J

• 100 J

• 140 J

Tags

NGSS.HS-PS3-1