Topic 10 Force and Motion

Two equal forces act at the same time with the SAME stationary object but in the opposite direction. Which statement describes the object's motion?

• The object remains stationary.

• The object moves at a constant speed.

• The object accelerates.

• The object changes direction.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two football linemen push against each other at practice. At first they do not move, then lineman A moves forward and lineman B moves backwards. Why does this happen?

• When the linemen push on each other they cause an action-reaction force that is equal.

• Because they push in different directions, the net force is zero.

• Lineman A pushes with a greater force causing a net force to act in his direction.

• The forces are balanced, no movement occurred.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student pushes on a tree with a force of 10 N. The tree does not move. How much force is exerted by the tree on the student?

• 0 N

• 5 N

• 10 N

• 20 N

Tags

NGSS.MS-PS2-1

Which car is traveling the fastest? HINT: You may want to use a calculator to calculate distance/time.

• CAR 1

• CAR 2

• CAR 3

• CAR 4

Tags

NGSS.MS-PS3-1

An airplane travels at a constant speed of 120 knots towards the east and then curves south. This is an example of the airplanes......

• speed.

• mass.

• acceleration.

• velocity.

The driver of a pickup truck is straight at 20 m/sec and suddenly stops. In which direction will his suitcase lying in the back of the truck move?

• Towards the front

• Towards the back

• To the left

• To the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What causes objects to move?

• Balanced forces

• Velocity

• Acceleration

• Unbalanced forces

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NGSS.MS-PS2-2

NGSS.MS-PS2-5

Which answer best describes velocity?

• Northwest

• 35 mph

• Southeast at 40 mph

• South

Which is NOT an example of acceleration?

• A car increasing speed as it passed another car.

• A truck slowing down as it turns a corner.

• A bike slowing down as it crosses the street.

• A parked car.

What TWO tools should be used to calculate speed? Choose ONLY TWO.

• balance

• spring scale

• meter stick

• stop watch