Force and Motion Review

Which puck(s) experienced the strongest force when hit?

How do you know?

Look for the mass and change.

• The black and purple hockey pucks; they have more mass than the green puck, but changed speed by the same amount.

• The purple hockey puck; it takes a stronger force to slow down a more massive object than to speed it up.

• The black hockey puck; it is more massive and has the fastest ending speed.

• All three hockey pucks experienced the same force because they changed speed by the same amount.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Sandra pushed a wooden block and it slid across the floor.

The wooden block gradually slowed down and stopped after moving 10 meters.

Why did the block stop moving?

For every action there is an opposite and equal reaction.

• 
  The block ran out of force.

• All objects stop moving because their natural state is to be still.

• The floor exerted a force that is opposite to the direction of the block’s motion.

• 
  The floor absorbs force from the block.

Tags

NGSS.MS-PS3-5

Which chair(s) experienced the strongest force when hit?

How do you know?

Look for greater mass and greater change.

• The blue chair experienced the strongest force because it takes more force to slow an object than it takes to make it go faster.

• All three chairs experienced the same force because they changed speed by the same amount.

• The red chair experienced the strongest force because it is as massive as the blue chair and has the highest ending speed.

• The blue and red chairs experienced the strongest force because they are both more massive than the yellow chair and they changed speed by the same amount.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which golf ball(s) experienced the strongest force when hit?

How do you know?

Look for greater mass and greatest change.

• The white golf ball because it has the fastest ending speed.

• 
  The green golf ball because it changed speed the most.

• 
  The green golf ball because it takes a stronger force to slow something down than to speed something up.

• 
  The white and purple golf balls because they gained force, while the green golf ball lost force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

In which crash did the skateboard experience a stronger force?

Why? Look for greater mass or greater change of speed.

• The skateboard experienced the same force in both crashes. The shopping cart changed speed by the same amount in each crash, so the force on the skateboard was the same each time.

• The diagram doesn’t tell you anything about the force on the skateboard. It only gives information about the force on the shopping cart.

• Crash 2; the force on the cart was stronger in this crash, so the force on the skateboard was also stronger.

• The skateboard did not experience a force; only the shopping cart experienced a force in the crashes.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which toy boat(s) experienced the

strongest force when it was bumped? 

How do you know?

Look for greater mass or greater change of speed.

• All three toy boats experienced the same strength force because they changed speed by the same amount.

• The orange and gray toy boats experienced the strongest forces because they both gained the same force as they sped up. The blue boat lost force, so it slowed down.

• 
  The gray toy boat experienced the strongest force because it had the fastest ending speed.

• The blue toy boat experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1