Chapter 8 Forces in Motion

The illustration shows forces acting on a box.

What is the net force on the box if the sliding friction between the box and the floor is 5N?

• 5N to the left

• 8N to the right

• 13N to the right

• zero net force

Tags

NGSS.MS-PS2-2

A boat moves forward through water with a force of 5,100 newtons(N). The water resists with forces equaling 4,800N. What is the net force acting on the boat?

• 300N

• 4800N

• 5100N

• 9900N

Tags

NGSS.MS-PS2-2

Two sailboats are moving as shown in the graph. Which statement is correct based on the data in the graph?

• Boat A traveled faster than Boat B.

• Boat B traveled faster than Boat A.

• Boat A traveled for a longer time than Boat B.

• Boat B traveled for a longer time than Boat A.

Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force. Which activity is an example of this law?

• A football is kicked off a tee.

• A baseball player slides into second base.

• A floating stick is carried over a waterfall.

• A bicycle travels faster as it goes downfall.

After a storm, a hospital may have to rely on backup generators to power some equipment. Which is the energy conversion provided by the generators?

• mechanical energy to electrical energy

• thermal energy to mechanical energy

• nuclear energy to mechanical energy

• thermal energy to electrical energy

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NGSS.HS-PS3-3

Mountain bike tires have large, knob-like treads. These tires are useful on steep slopes because they_______________________.

• increase friction

• carry heavy weights

• increase the stopping distance

• prevent braking of the bicycle

Rowing a boat forward requires a force that will overcome friction from water and wind. Which factor MOST helps overcome the forces working against the boat?

• the length of the boat

• the height of sides of the boat

• the weight of the rowers in the boat

• the number of people rowing in the boat

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NGSS.MS-ETS1-1

Riding a bicycle produces several forms of energy. Which form of energy is produced in the GREATEST amount by pedaling a bicycle down the sidewalk?

• chemical

• radiant

• kinetic

• sound

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Angela has a toy made out of a coil of wire. She places the toy at the top of some stairs. The toy can travel down each step, end-over-end.

Which type of energy does the toy have when it is placed at the top of the stairs?

• electric

• kinetic

• magnetic

• potential

Tags

NGSS.MS-PS3-2

The drawing shows a waterfall flowing into a pool of water. Which statement BEST describes the energy of the objects in the drawing?

• The pool of water has more kinetic energy and the falling water has more potential energy.

• The falling water has potential energy and the rock which it flows has kinetic energy.

• The water has potential energy at the top of the waterfall and increasing kinetic energy as it falls.

• The water at the top of the fall has kinetic energy that becomes potential energy as it falls into the pool.

Tags

NGSS.MS-PS3-2