Forces and Motion Review 5.P1.1 & 5.P.1.2

Forces and Motion Review 5.P1.1 & 5.P.1.2

Forces and Motion

•  gravity, friction, & change in mass affect motion

• predict effect of force or change in mass on motion of object

  
  

Poll

I know a force called gravity can pull objects down to the ground.

• YES

• NO

Multiple Choice

Students take turns pushing a large, heavy ball on the school

parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students

• compare the distances that the ball rolled

• compare the number of times the ball was rolled

Multiple Choice

Which statement is true about a seesaw?

• A seesaw will remain balanced when objects of the same weight are

  positioned on each end.

• A seesaw will be unaffected by the weight of the objects on each

  end.

• A seesaw will remain balanced when objects of different weights are

  positioned on each end.

Multiple Choice

Which will most likely happen to a kite in the air if the wind stops

blowing?

• The kite will float away due to decreased wind speed.

• The kite will go higher due to gravity.

• The kite will fall to the ground due to gravity

Multiple Choice

Thomas kicked a soccer ball with a certain force. After the ball stopped moving, John kicked the same soccer ball with a greater force. Which statement describes what most likely happened to the ball?

• The ball moved faster and farther when John kicked it.

• The ball moved faster but not as far when John kicked it.

Poll

Compare Mass and Weight, what can you say about them?

• They are the same. They tell us how heavy an object weighs.

• They are not the same.

  WEIGHT is the unit used to measure the pull of gravity on an object. While MASS is the unit we use to measure how much matter an object has.

How does mass affect the motion of an object?

1) If two balls with different mass are rolled on a flat surface,

which will go further?

The ball with the least mass will go the furthest.

2)If two balls with different mass are rolled down a ramp, which

will go further?

The heavier ball will go further.

How does mass affect the motion of an object?

3) If two balls with different mass but have the same shape and size are dropped from the same height which will hit the ground first?

Both balls will hit the ground at the same time because of Inertia (the bigger the mass, the heavier, the more force it has to resist change in motion or MORE MASS=MORE FORCE)

2)If two objects - coin and feather-with different mass and surface area are dropped from the same height which will hit the ground first?

The coin will hit the ground first because it has less surface area meaning LESS AIR RESISTANCE.

How does mass affect the motion of an object?

5) Momentum - When heavy objects keep moving because their mass is in motion more than lighter objects (harder to slow down).

MORE Mass = MORE Force

Less Mass = Less Force

Multiple Choice

Four identical wagons carrying different amounts of sand are released from the same height and allowed to roll down a hill. No sand falls out of the wagons.

 One contains 5 kilograms.

 One contains 10 kilograms.

 One contains 15 kilograms.

 One contains 20 kilograms.

Which wagon would require the greatest force to stop its motion at the bottom of the hill?

• the wagon with 5 kilograms of sand

• the wagon with 20 kilograms of sand

Multiple Choice

Two balls of similar shape and size, one weighing 1 kg and the other 2 kg, are both dropped from the top of a ladder at the same time. Which ball will hit the ground first?

• Gravity will cause both to hit the ground at the same time.

• Friction (air resistance) will cause both to hit the ground at the same time.

Multiple Choice

A truck is traveling 70 mph with a heavy load in its trailer. After the truck is unloaded, it again travels 70 mph. Which best explains how the force acting on the truck changed after the truck was unloaded?

• A smaller force was needed to move the truck because it had less

  mass.

• A larger force was needed to move the truck because it had less

  mass.

Multiple Choice

A boy puts several kilograms of rocks in an empty wagon. How will the motion of the wagon be different after it is filled with rocks?

• It will be easier to speed up, but more difficult to slow down.

• It will be more difficult to speed up, but easier to slow down.

The motion of objects are based on how far they travel in certain amount of time & direction

SPEED always have a DIRECTION and amount of TIME.

Line Graph is the best way to show DISTANCE over TIME relationship.

Multiple Choice

To determine the motion of an object, what information should be known?

• the time the object moves and the mass of the objec

• the distance the object moves and the time it takes to move that distance

Multiple Choice

An object travels 5 meters in one second. After two seconds it has traveled 10 meters, and after three seconds it has traveled 15 meters. Which best describes the motion of the object?

• It is going faster.

• It is slowing down.

• It is moving at a constant speed.

Multiple Choice

Ball X travels the distance in 15 seconds. Ball Y travels the

distance in 11 seconds. Which best compares the motion of the two

balls?

• Ball X travels faster than Ball Y.

• Ball Y travels faster than Ball X.

Multiple Choice

Car A is traveling at 70 miles per hour. Car B is traveling 65 miles per

hour. Which statement is true about the movement of the two cars?

• Car A will travel farther than Car B in the same amount of time.

• Car B will travel farther than Car A in the same amount of time.

Multiple Choice

A model car travels 10 meters in 15 seconds. How many meters will it travel in 45

seconds?

• 20 meters

• 30 meters

• 35 meters