Energy,Force and Motion (2)

True or false:  At the peak of the lift hill, a rollercoaster car has more potential energy than any other form of energy.

• True
• False

Tags

NGSS.MS-PS3-2

A greater applied force is required to move an object with a greater mass than one with a smaller mass.

• True
• False

Tags

NGSS.MS-PS2-2

What must occur to a shopping cart at rest in order to make it roll forward?

• A force must be provided to overcome gravity.
• Balanced forces must be acting on the cart.
• An unbalanced force applied to the cart pushing or pulling it forward.
• The unbalanced force acting upon it must be smaller than that of friction.

Tags

NGSS.MS-PS2-2

What is the unit used to measure force? 

• Pounds 
• Grams 
• Newtons 
• kg/ m²

Rebecca is practicing her aim by throwing a ball at a target.

The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?

• The ball exerts a larger force on the target, causing the target to have a larger change of motion than the ball.

• The target exerts the same size force on the ball, so when the target moves in one direction, the ball moves in the opposite direction.

• The ball exerts a smaller force on the target because the ball is smaller than the target, so the target causes the ball to bounce backward.

• The target exerts a larger force on the ball because the ball is very bouncy.

Tags

NGSS.MS-PS2-1

A box has two forces acting on it. One force is 100 N upward. Another force is 50 N downward. What is the net force on the box?

• 100 N upward

• 50 N upward

• 50 N downward

• 100 N downward

Tags

NGSS.MS-PS2-2

Why is friction force considered to be a contact force?

• Friction affects only solid objects.

• Friction always acts in the same direction.

• Friction is produced when objects slide past one another.

• Friction acts in a direction opposite to the direction of an object’s motion.

Tags

NGSS.MS-PS2-2

What is force?

• transfer of energy

• creation of energy

• push or pull

• result of a physical change

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If you apply force to an object, you can change its...

• direction only

• speed and direction

• mass

• speed only

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The formula for work is

• Work = force x distance

• Work = power x distance

• Work = force x time

• Work = power x time