Contact Forces OST Review

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.

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NGSS.MS-PS2-2

NGSS.MS-PS3-1

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?

• in the direction arrow P is pointing
• in the direction arrow Q is pointing
• in the direction arrow R pointing
• in the direction arrow S is pointing

Tags

NGSS.MS-PS2-2

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

• a toy car rolling faster down a ramp
• a car remaining parked in a parking lot.
• a bike moving at a constant speed around a circular track
• a truck slowly speeding up after being stopped at a stoplight
• a bus moving at a constant speed in a straight direction on the highway

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NGSS.MS-PS2-2

• Speed decreases
• Speed increases
• Speed remains constant

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

• Speed decreases
• Speed increases
• Speed remains constant

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

• Speed decreases
• Speed increases
• Speed remains constant

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

• Speed decreases
• Speed increases
• Speed remains constant

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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.

• Pull with less force

• Pull with more force

• Add an apple to the basket

• Take an apple out of the basket

• Roughen the surface of the table to decrease friction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

• A motorcycle turns a corner at a constant speed.
• A bowling ball slows down as at moves down the lane.
• A golf ball speeds up as it is hit by a golfer.
• A go-kart travels straight at a constant speed.

Tags

NGSS.MS-PS2-2

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?

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

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

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

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

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2