Forces

What is a force?

• a push or pull
• speed or acceleration 
• potential or kinetic energy
• balanced or unbalanced force

When objects remain in the same place, it is called...

• gravity
• friction
• balanced force
• unbalanced force

What is the force that causes everything to be pulled down to the Earth?

• friction
• gravity
• balanced
• unbalanced

An unbalanced force is when objects move in one direction because the force is greater from that direction.

• true
• false

Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

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?

• wind

• friction

• gravity

• magnetism

If a student has two magnets, how might it be determined which magnet is stronger?

• Count how many paper clips each magnet can lift.

• Submerge each magnet in a bowl of water.

• Examine each magnet to determine the north pole.

• Measure the length and the mass of both magnets.

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?

• How does changing the height of a ramp affect the distance a toy car rolls?

• How does changing the surface of a ramp affect the distance a toy car rolls?

• How does mass affect the distance a toy car moves after rolling down a ram?

• How does the design of a toy car affect its movement after rolling down a ramp?

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?

• How does the mass of the toy car affect its speed?

• How does friction affect the distance a toy car rolls?

• What mechanical advantage does an inclined lane give?

• Why does gravity make a toy car roll down a ramp?

Edward kicks a soccer ball across the backfield. What force works to slow the ball down?

• pushes and pulls
• friction
• magnetism
• gravitation