Science Unit 1 Review

Which equation correctly describes the relationship between pressure, force, and area?

• Pressure = force/area

• force = pressure/area

• pressure - area = force

• pressure = force x area

Huckleberry read that bobcats can reach speeds of up to 30mi/hr. What does the speed of a bobcat indicate?

• The time it takes to reach its maximum speed

• The total amount of time it travels in one direction

• The distance it travels to move between two points

• The distance it can travel in a certain amount of time

Quad wants to determine how fast a bowling ball travels when it is bowled. He uses a stopwatch to record, in seconds, the time it takes for the bowling ball to reach the pins. Which unit would be most appropriate to measure the length of the bowling lane?

• meters

• kilometers

• millimeters

• centimeters

A moving object collides with a stationary object. Which of the following statements is true according to Newton's third law of motion?

• Each object exerts a force on the other, and the two forces are equal and in opposite direction.

• Each object exerts a force on the other, and the two forces are the same in magnitude and direction.

• Each object exerts a force on the other, and the two forces are proportional to the masses of the objects.

• The moving object exerts a force on the stationary object, but the stationary object does not exert a force on the moving object.

Which statement about fluid pressure is true?

• Areas of low pressure spin around regions of high pressure

• Areas of low pressure are warmer than areas of high pressure

• Fluids move from areas of low pressure to areas of high pressure

• Fluids move from areas of high pressure to areas of low pressure

Why does a helium-filled balloon expand as it rises into the atmosphere?

• Helium particles become larger as they rise

• Atmospheric pressure decreases with altitude

• Air becomes more dense higher in the atmosphere

• The pressure of the gas inside the balloon increases as it rises

Which is an example of centripetal acceleration?

• an object at rest

• an object moving in a circle at 20m/s

• an object moving at 20m/s backward, then 20 m/s to the right

• an object moving in a straight line at a steady speed of 20 m/s

Why is the magnetic force considered to be an action-at-a-distance force?

• Magnets must be far apart in order to exert a force

• Magnets do not have to touch each other to experience a force

• Magnets push each other apart to increase the distance between them

• Magnets must be large in size in order to exert a force that is strong enough to notice

Describe the law of universal gravity.