Answers Summer School LA-Biology CRThe Musculoskeletal and Integumentary Systems

Introduction to Forces Answers

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Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

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The table represents the forces on four objects, with directions.ObjectF1 ↑F2 →F3 ←F4 ↓W30 N20 N20 N30 NX15 N35 N25 N15 NY60 N0 N0 N60 NZ45 N0 N22 N45 N

Objects W and X have balanced forces, and objects Y and Z have unbalanced forces.

Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.

Objects X and Y have balanced forces, and objects W and Z have unbalanced forces.

Objects X and Z have balanced forces, and objects W and Y have unbalanced forces.

Jasper and Gemma are going to play on a teeter totter. Gemma gets on first. When Jasper gets on, Gemma moves into the air, but she does not move to the top.

The forces are balanced because Jasper weighs the same as Gemma.

The forces are unbalanced because Jasper weighs the same as Gemma.

The forces are balanced because Jasper weighs more than Gemma.

The forces are unbalanced because Jasper weighs more than Gemma.

An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?

The net force is positive.

The net force is zero.

The positive force is greater than the negative force.

The negative force is greater than the positive force.

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

If forces acting on an object are unbalanced, which factor may result from an unbalanced force?

The net force is negative.

There is zero net force.

The forces cancel each other out.

There is no change in motion.

If forces acting on an object are unbalanced, the object could experience a change in ________.

mass, speed, or direction

negative acceleration or mass

direction, mass, or both

speed, direction, or both

Which best describes two counteracting forces on an object?

using a dolly to push a box to another location

two children pulling apart a wishbone

a group of dogs pulling a dogsled across ice

two people pushing a broken-down car up the road

Which best explains parallel forces?

left and right forces that can be added together

right and upward forces that cancel each other out

addition of parallel forces that cannot result in a negative force

left and downward forces that cancel each other out

Two boxes need to be moved into storage. Jamal and Jude each want to move a box. The force of gravity on both the boxes is 50 N. Jamal is lifting with a force of 60 N, and Jude is lifting with a force of 45 N.

Jamal moved his box to storage, but Jude could not move his.

Jamal and Jude can successfully move each box into storage.

Jamal could not move his box to storage, but Jude could.

Neither Jamal nor Jude could move the boxes into storage.

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Introduction to Forces Answers

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