Quiz about Contact Forces OST Review

Question 1

Select the graph that best represents the situation below.  A wooden block starts at rest.  A constant , unbalanced force is applied to the block from 0 to 3 seconds. At 3 seconds, the forces on the block balance and remain that way until 6 seconds.

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 2

When four forces are applied to a box, the box begins to move.  The diagrams arrows show the direction and the magnitude of the four forces acting on the box. In which direction will the box move?

Accepted Answer

in the direction arrow S is pointing

Answer

in the direction arrow P is pointing

Answer

in the direction arrow Q is pointing

Answer

in the direction arrow  R pointing

Question 3

Select the three situations in which unbalanced forces are acting on the objects.

Accepted Answer

a toy car rolling faster down a ramp

Accepted Answer

a bike moving at a constant speed around a circular track

Accepted Answer

a truck slowly speeding up after being stopped at a stoplight

Answer

a car remaining parked in a parking lot.

Answer

a bus moving at a constant speed in a straight direction on the highway

Question 4

Question 4.

Accepted Answer

Speed remains constant

Answer

Speed decreases

Answer

Speed increases

Question 5

Question 5.

Accepted Answer

Speed increases

Answer

Speed decreases

Answer

Speed remains constant

Question 6

Question 6.

Accepted Answer

Speed decreases

Answer

Speed increases

Answer

Speed remains constant

Question 7

Question 7.

Accepted Answer

Speed remains constant

Answer

Speed decreases

Answer

Speed increases

Question 8

A basket of apples is pulled with a constant force.  A friction force acts in a direction opposite to the motion. The basket starts at rest and increases its speed over time. Select each action that will reduce the rate at which the speed of the basket changes.

Accepted Answer

Pull with less force

Accepted Answer

Add an apple to the basket

Accepted Answer

Roughen the surface of the table to decrease friction

Answer

Pull with more force

Answer

Take an apple out of the basket

Question 9

In which of the following situations are the forces acting on an object balanced?

Accepted Answer

A go-kart travels straight at a constant speed.

Answer

A motorcycle turns a corner at a constant speed.

Answer

A bowling ball slows down as at moves down the lane.

Answer

A golf ball speeds up as it is hit by a golfer.

Question 10

Horizontal forces act on two boxes, initially at rest, as shown.  The magnitude and direction of the horizontal forces are also shown. What happens to Box X and Box Y as a result of the forces?

Accepted Answer

Box X starts moving, speeding up, and Box Y remains at rest.

Answer

Box X starts moving at a constant speed, and Box Y remains at rest.

Answer

Box X starts moving at a constant speed, and Box Y starts moving, speeding up.

Answer

Box X starts moving, speeding up, and Box Y starts moving at a constant speed.

Question 11

A battery-powered toy submarine is moving through water at constant speed and at a constant depth below the surface.  The diagram shows the submarine with arrows representing the directions but not the magnitudes of four forces acting on it.  Which conclusion can be made about the magnitudes of the forces acting on the submarine?

Accepted Answer

Force Q is equal to Force S and Force R is equal to force T.

Answer

Force Q is less than Force S and Force R is equal to Force T

Answer

Force Q is equal to Force S and Force R is greater than force T.

Answer

Force Q is less than to Force S and Force R is greater than force T.

Question 12

A large block is being pushed to the left at a constant speed across a tabletop, as shown in the following diagram. The forces acting on the block are labeled. Which statement about the block is true?

Accepted Answer

Because the block is moving at a constant speed, the pushing and friction forces are balanced.

Answer

Because the block is moving to the left, the pushing force must be greater than the weight of the block.

Answer

Because the block is moving to the left, the pushing force is greater than the force of friction.

Answer

Because the block is moving to the left, the net force is something other than 0 N.

Question 13

A girl riding a bicycle passes a boy standing on a sidewalk.  How does the boy appear to be moving relative to the girl after she has passed him?

Accepted Answer

The boy appears to get closer.

Answer

The boy appears to be standing still.

Answer

The boy appears to be moving away.

Answer

The boy appears to be moving more slowly.

Question 14

The diagram shows a toy car on a track that is lying on the floor. What is the net force when the car is at rest?

Accepted Answer

Net Force = Zero

Answer

Net Force = Up

Answer

Net Force = Down

Answer

Net Force = Right

Question 15

A hockey puck is moving across the ice as indicated by the arrow. Which Free Body Diagram best represents the puck?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 16

Which of the following is an example of a balanced force? (Select all that apply)

Accepted Answer

A pen sitting motionless on the desk

Accepted Answer

A car with its cruise control on traveling on a straight road

Answer

When a red light turns green a car starts to move

Answer

A skydiver jumping out of a plane

Answer

A football player changing directions to avoid being tackled

Question 17

The diagram shows a series of energy changes involving a ball and a spring. The ball is initially at rest, rolls off the platform and falls toward the ground, then lands on the spring. Which energy label should go in the before box in the diagram?

Accepted Answer

Gravitational

Answer

Chemical

Answer

Elastic

Answer

Electrical

Question 18

The diagram shows a series of energy changes involving a ball and a spring. The ball is initially at rest, rolls off the platform, and falls toward the ground, then lands on the spring. Which energy label should go in the after box in the diagram?

Accepted Answer

Elastic

Answer

Chemical

Answer

Electrical

Answer

Gravetational

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