Force and Motion

A 600g basketball, a 500g football, a 150g baseball, and a 50g yo-yo: four toys. If you had to throw one of the four, which one would take the MOST force to throw?

• baseball

• basketball

• football

• yo-yo

Two classes of students line up for a tug of war. If both classes have the same number of students on a team, what other factor is very important so one team can win?

• total mass of each team

• condition of the ground

• age of students on each team

• height of students on each team

The image above shows two opposite forces acting on a box, what can we say that is true about the affect of the forces on the box?

• It cannot be determined without knowing which man is stronger.

• It cannot be determined without knowing the surface the box is on.

• The forces are balanced. But, the forces acting on the box have increased and the box’s motion is affected.

• The forces are balanced. Thus, there is no change in forces acting on the box and the box's motion is not affected.

When a moving object is acted on by unbalanced forces, the object will

• stop moving.

• move in unpredictable patterns.

• move in the same direction as the stronger force.

• move in the direction opposite the stronger force.

Four students tried out for a softball team. Each student threw the ball from the pitcher’s mound to home plate. The coach recorded how many seconds it took each throw to reach home plate.

Which student threw the ball with the greatest force?

• Conor

• Leroy

• Pete

• Jake

The box in the picture begins motionless, and then both forces are applied at the same time. Describe the resulting motion of the box.

• The box will not move.

• The box will move to the left.

• The box will move to the right.

• The box will move to the left and then the right.

Roy throws a ball up in the air. Each time he throws the ball up in any direction, it falls back to the ground as shown in the illustration. The ball comes back to the ground because of the

• weak electric force of the earth.

• strong magnetic force of the earth.

• force of air resistance on the ball.

• strong gravitational force of the earth.

What would be an ideal experiment to test how different types of surfaces affect friction?

• Two objects of equal weight placed on two glass surfaces of equal lengths.

• Two objects of equal weight placed on two glass surfaces of unequal lengths.

• Two objects of equal weights placed on a glass surface and a wooden surface.

• Two objects of different weights placed on two wooden surfaces of unequal lengths.

How fast an object is moving is its

• direction.

• motion.

• position.

• speed.

Diego kicks a soccer ball from the end line. His fellow students time and mark the soccer ball as it moves down the field. The graph represents the ball's progress.

Based on the graph, during what time is the soccer ball not moving?

• from 0 to 1.5 seconds

• from 3.0 to 4.5 seconds

• from 4.5 to 5.0 seconds

• from 1.5 to 3.0 seconds