Ps

At which position does the ball’s mechanical energy equal its potential energy? (hint they're @ 0)

• k

• l

• J

• M

A 20-kg ball and a 50-kg ball rest at the top of a ramp. Which statement best describes the potential energy of the balls?

• The 20-kg ball has the greater potential energy because it has less inertia.

• The 50-kg ball has the greater potential energy because it has the greater mass.

• They have the same potential energy because gravity has the same effect on each one.

• They have the same potential energy because their positions are the same.

Tags

NGSS.MS-PS3-2

Which position has the least amount of kinetic energy?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which choice best describes the object’s motion from 2 to 5 seconds?

• The object sped up

• The object slowed down.

• The object moved at a constant speed.

• The object was at rest and was not moving.

How long did the train travel before stopping?

• 0.20 hour

• 0.50 hour

• 0.70 hour

• 0.90 hour

Samuel rode his bicycle for 30 minutes without stopping for a break. He traveled 6 miles during the first 15-minute period. He traveled 4 miles during the second 15-minute period. Which statement describes Samuel’s motion?

• Samuel traveled a total of 9 miles.

• Samuel traveled more slowly in the first 15 minutes than he did in the last 15 minutes.

• Samuel traveled faster in the first 15 minutes than he did in the last 15 minutes.

Mikayla stands on a beach and sees a sailboat in the ocean. How could Mikayla determine whether the sailboat is moving?

• by determining the weight of the boat

• by examining the height of the ocean waves

• by using a reference point to measure the change in the boat’s position over time

A ball rolls on a carpet. The ball experiences friction as it rolls. How will friction affect the ball’s motion?

• The ball experiences an unbalanced force and will slow down

• The ball experiences an unbalanced force and will speed up

• The ball experiences balanced forces and will slow down.

• The ball experiences balanced forces and will speed up

Tags

NGSS.MS-PS2-2