I Check for Gravity and Energy

A soccer ball is sitting still on a flat field.

What forces are acting upon it?

• The downward force of gravity.

• The upward force of the ground.

• All forces are acting on the ball.

• No forces are acting on the ball.

Tags

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?

• The ball stays at rest until another force (kick) acts upon it.

• It accelerates when in contact with the player's foot.

• Then decelerates from friction until it stops.

• No forces are acting on the ball.

Tags

NGSS.MS-PS2-1

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-PS3-4

At the start, the ball had ______________________ energy, which transferred to _______________________ energy as it rolled down the ramp. When the ball reached its highest point on the other side of the ramp, all its energy transferred to ________________________energy.

• potential, potential, potential

• kinetic, kinetic, kinetic

• kinetic, potential, kinetic

• potential, kinetic, potential

Tags

NGSS.MS-PS3-4

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 constant speed for a while and then slows down.

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

Tags

NGSS.MS-PS2-2

Why would the boat move slower and slower.

• Once the force exerted by the boat engine is removed, friction between the water and boat (and the air and the boat) will decelerate the boat.

• Once the force exerted by the boat engine is removed, friction between the water and boat (and the air and the boat) will accelerate the boat.

• There is no force exerted on the boat.

Tags

NGSS.MS-PS2-2

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.

• When player 1 collided with player 2, player 1's kinetic energy transferred to player 2.

• Player 1 could slow down, stop , change direction, or fall, while player 2 would begin moving away from the collision point and possibly fall.

• Player 1 will run into player 2 and player 2 will not move at all.

• Both players will stop immediately and no energy will be transferred.

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.

• Just before the ball hits the ground.

• When the ball is at its highest position.

• As the ball begins to slow down.

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.

• Just before the ball hits the ground.

• When the ball is at its highest position.

• As the ball begins to slow down.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Explain how Earth causes changes in the ball’s potential and kinetic energy.

• Earth's gravity is the Force increasing the ball's potential energy the further it is from the Earth's surface, and increases the ball's kinetic energy as it falls toward Earth.

• Earth's energy is the Force decreasing the ball's potential energy the closer it is from the Earth's surface, and decreases the ball's kinetic energy as it falls toward Earth.

• Earth's gravity is the Force decreasing the ball's kinetic energy the further it is from the Earth's core, and decreases the ball's kinetic energy as it falls toward the Moon.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

NGSS.MS-PS3-5