Which is true about Newton's third law of motion?

• For every action, there is an equal and opposite reaction.
• When you push against a wall, it reacts and pushes back at you.
• For every action, there is an opposite reaction (force) that is almost equal to it.
• If two movable objects push against each other, the one with the larger mass will move less.

Tags

NGSS.MS-PS2-1

Which of the following best describes what a centripetal force is?

• A force that continually pulls a spinning object towards its center.
• A force that comes from a string.
• The craters of the moon

Tags

NGSS.MS-ESS1-2

Which of the following uses a centripetal force?

• A baseball
• A flying bird
• The moon orbiting the Earth

Tags

NGSS.MS-ESS1-2

Which of the following is true about friction?

• Friction speeds things up.
• Friction produces heat.
• Friction wears down objects.
• Friction allows things to not wear out.

Which of the following is true about lubricants?

• A lubricant is a substance that increases friction.
• Lubricants reduce friction between two surfaces.
• A common lubricant would be oil.
• A lubricant fills in the tiny bumps and cracks in a surface.

Which of the following help to reduce friction?

• Ball bearnings.
• sandpaper
• starfish
• wheels

Which of the following are correct formulas for slope?

• slope = rise / run
• slope = run / rise
• slope = change in y / change in x
• slope = change in x / change in y

Which of the following are correct formulas for slope?

• slope = rise / run
• slope = run / rise
• slope = change in y / change in x
• slope = change in x / change in y

Which of the following is true about pressure?

• It is a pulling force.
• Pressure relates to the amount of force put on a given surface area.
• It is a pushing force.
• Pressure is calculated by dividing the force by the area.

You can increase the pressure by decreasing the surface area which is related to the concept of using a sharp knife compared to a dull knife.

• true
• false