Gravity and Kinetic Energy 3 I-Check Review

A soccer ball is sitting still on a flat field.

What forces are acting upon it?

Answer explanation

The downward force of gravity and the upward force of the ground. These balanced forces are keeping the soccer ball still.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If a player kicks the ball once and it moves across the grass, how would Sir Isaac Newton explain what happens to the ball?

Answer explanation

The ball stays at rest unless another force (kick) acts upon it. It accelerates when in contact with the players foot and then decelerates from friction until it stops.

Tags

NGSS.MS-PS2-2

A bowling ball is rolling down a ramp with a certain amount of kinetic energy. Which change to the system will increase the ball's kinetic energy most?

• Doubling the weight of the bowling ball

• Doubling the mass of the bowling ball

• Doubling the speed of the bowling ball

• Doubling the volume of the bowling ball

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

he ball in the diagram is held at the start position. When released, it rolls down the ramp, travels up the other side to position 1, then rolls back down the ramp.Select the words in the blanks to describe how

potential and kinetic energy is transferred in this situation. 

At the start the ball had _______ energy that transferred to _______ energy.

• potential

  kinetic

• kinetic

  potential

• no

  potential

• no

  kinetic

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

The ball in the diagram is held at the start position. When released, it rolls down the ramp, travels up the other side to position 1, then rolls back down the ramp.Select the words in the blanks to describe how

potential and kinetic energy is transferred in this situation. 

When the ball reaches the highest point on the other side of the ramp, all its energy is transferred to _____ energy.

• potential

• kinetic

• no

• light

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

A motor boat is traveling 10 m/s on a sunny calm day.

The driver turns off the engine. Apply Newton's first law to explain what happens to the boat as it glides through the water.

• The boat moves slower and slower

• The boat moves at a constant speed

• The boat moves at a constant speed for a while and then slows dons.

• The boat slows down for a while and then moves at a constant speed

The driver turns off the engine. Using Newton's Laws explain why the boat would move slower and slower.

Answer explanation

Once the force exerted by the boat's engine is removed friction between the water and the boat will slow the boat down.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

While playing hockey, player 1 is speeding down the rink, and doesn't see player 2 standing still on the ice. Player 1 collides with player 2. Explain what happens to the kinetic energy and motion of each player during the collision.

Answer explanation

When player 1 collided with player 2, players 1's kinetic energy transferred to player 2. Player 1 could fall down, change direction, or fall. Player 2 would move away from the collision point and possibly fall.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-5

A teacher throws a tennis ball straight up into the air.  At what point does the ball have the most potential energy?

• Right after the ball leaves the teacher's hand

• As the ball begins to slow down

• Just before the ball hits the ground

• When the ball is at its highest point

Tags

NGSS.MS-PS3-2

A teacher throws a tennis ball straight up into the air. 

At what point does the ball have the most kinetic energy.

• Right after the ball leaves the teacher's hand

• As the ball begins to slow down

• Just before the ball hits the ground.

• When the ball is at its highest point

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5