______ is a contact force that opposes the motion of an object.

_______ is a noncontact force that pulls objects toward Earth.

________ is a noncontact force that pulls on metal objects containing iron.

________ is the amount of matter in an object.

An object will move ________ when you push it harder.

Smooth surfaces cause less friction. Rough surfaces cause_______ friction.

If you traveled to the moon your weight would ________.

Some students wanted to find out if a tennis ball and a baseball dropped from the same height hit the ground at the same time. This investigation tests the effect of which of the following?

Students conducted an investigation in which they rolled a soda can down a ramp that was 30 cm high and one that was 40 cm high. Which question were the students most likely trying to answer?

Students conducted an investigation in which they measured the distance a toy car traveled after rolling down a ramp covered with sandpaper or wax paper. Which of these questions can the students answer by analyzing the results of their investigation?

Students conducted an investigation in which they let the same car roll down the same ramp in three different locations in their school with three different floor types, as shown in the picture. Which of the following questions was this investigation most likely designed to answer?

A student makes a swing move by pushing it. If a student pushes the swing harder, the swing will most likely---

When the rope is pulled, in which direction will the bricks move?

Forces are represented using which shape?

When do we see friction?

When an apple falls on the ground, like in the picture, the force that is applied to it is________________.

When two objects rub together, what force do they produce

A softball is tossed outside a window. Which two forces will act on the ball's motion as the ball flies and then hits the ground?

An icy road would have ________ friction.