Physics Forces at an Angle

Two people lift a heavy box a distance of 15 m. They use ropes, each of which make an angle of 15 degrees with the vertical. Each person exerts a force of 225 N. How much work is done by the ropes

• 3.29 x 10³ J

• 6.5 x 10³ J

• 4.0 x 10⁴ N

• 2.45 x 10² J

An airplane passenger carries a 215-N suitcase up the stairs , a displacement of 4.20 m vertically and 4.60 m horizontally. How much work does the passenger do on the suitcase.

• 903 J

• 989 J

• 976 J

• 945 J

A rope is used to pull a metal box a distance of 15.0 m across the floor. The rope is held at an angle of 46 degrees with the floor, and a force of 628 N is applied to the rope. How much work does the rope do on the box.

• 6.54 x 10^{3 N}

• 6.77 x 10^{3 J}

• 5.34 x 10³ J

• 6.54 x 10 ^{3 J}

Tags

NGSS.HS-PS3-1

A sailor pulls a boat a distance of 30.0 m along a dock using a rope that makes a 25 degree angle with the horizontal. How much work does the rope do on the boat if its tension is 255 N?

• 7.65 x 10³ J

• 6.93 x 10³ J

• 7.65 x 10³ N

• 5.23 x 10³ J

Tags

NGSS.HS-PS3-1

A mover loads a 185-kg refrigerator into a moving van by pushing it at a constant speed up a 10.0 m , friction free ramp at an angle of inclination of 11 degrees. How much work is done by the mover on the refrigerator?

• 1.86 x 10^{3 J}

• 3.45 x 10² J

• 3.46 x 10³ J

• 1.78 x 10^{4 J}

Tags

NGSS.HS-PS3-1

A wagon with a constant force is pushed by a student over a distance. What is the change in energy of the wagon when 5.0 N of force is applied over 0.5 m?

• 0.025 J

• 0.25 J

• 2.5 J

• 10.0 J

Tags

NGSS.HS-PS3-1

When a force is applied at an angle to the direction of motion, the only work done is...?

• by the component of the force applied in the direction of he displacement.

• by the component of the force pushing downward

• by the force of friction between the object and the ground

• by the component of the force applied perpendicular to the direction of the displacement.

If an object with a mass of 200g moves a distance of 2.1 m when a force of 6.4N is applied, what is the amount of work done?

• 13 J

• 420 J

• 1280 J

• 95 J

Tags

NGSS.HS-PS3-2

A 10.0 kg box on a smooth, frictionless, horizontal surface experiences a downward force of 30.0 N at an angle of 40 degrees to the horizontal. The box moves 1.5 m to the right. What was the work done by gravity?

• 34.5 J

• 1.80 kJ

• 28.9 J

• 0.00J

For an ideal machine, the output work is always

• greater than the input work

• equal to the input work

• less than the input work

• insufficient information to answer the question

Tags

NGSS.HS-PS3-3