Force & Motion1
Which best describes the force of gravity?
A) A pulling force
B) a pushing force
C) a change in mass
d) a change in speed
A- A pulling force
Team 1 and Team 2 each have five people who are pulling with equal force on opposite ends of a rope. Which will most likely happen if Team 1 stops pulling on the rope?
A) Team 1 will pull the rope closer to their side.
B) Team 2 will pull the rope closer to their side.
C) The rope will fall to the ground on both sides.
D) The rope will continue to be pulled in both directions.
B) Team 2 will pull the rope closer to their side
Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?
a) chemical
b) mechanical
c) nuclear
d) physical
A- Chemical
Which factor speeds up the process of evaporation during the water cycle?
a) low humidity
b) low air pressure
c) high air pressure
d) high temperature
D- high temperature
Which is an example of condensation?
a) water boiling in a pot
b) water being absorbed by plants
c) salt being removed from water
d) moisture on mirror after hot shower
D- moisture on mirror after hot shower
A train is traveling at a constant speed of 70 mph. The first stop is scheduled after traveling 210 miles. How long will the train travel before it comes to its first stop? (speed = distance ÷ time)
A) 2 hours
B) 2 1/2 hours
C) 3 hours
D) 4 1/2 hours
A- 2 hours
Which best describes the relationship between movement and friction?
a) As the rate of friction increases, the rate of movement increases.
b) As the rate of friction increases, the rate of movement decreases.
c) As the rate of friction decreases, the rate of movement decreases.
d) As the rate of friction decreases, the rate of movement is unchanged.
B) As the rate of friction increases, the rate of movement decreases.
A glass of water is placed outside during a hot day. After a few hours, someone notices that there is less water in the glass. Which best explains why this happened?
a) water melted; gas formed
b) water evaporated; gas formed
c) water evaporated; liquid formed
B- Water evaporated; gas formed
Which process in the water cycle returns water to the atmosphere?
a) condensation
b) evaporation
c) precipitation
d) transpiration
B- evaporation
Which two processes increase the amount of water vapor in the atmosphere as a result of heat from the sun?
a) transpiration and evaporation
b) condensation and precipitation
c) evaporation and condensation
d) transpiration and evaporation
A- transpiration and evaporation
Which information is needed to determine the speed of an object?
A) the weight of the object and the distance it travels
B) the pull of gravity on the object and the amount of time it travels
C) the inertia of the object and the amount of force that is pushing it
D) the distance the object travels and the time it takes to travel that distance
D- the distance the object travels and the time it takes to travel that distance
Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?
a) ball with a mass of 5 kg
b) ball with a mass of 10 kg
c) ball with a mass of 15 kg
d) ball with a mass of 20 kg
D- ball with a mass of 20 kg
Susan is completing an experiment in science. She mixes 1 cup of hot water with 2 cups of salt. What will most likely happen to the substances?
a) The substances will blend and their properties will be changed.
b) The substances will not blend and their properties will be changed.
c) The substances blend and form another liquid that appears as a solid.
d) The substances will not blend and their properties will be the same as the individual substances.
a) The substances will blend and their properties will be changed.
The sun shines on the lake and water vapor rises from the lake into the atmosphere. The vapor cools and becomes water droplets in the clouds. The droplets return to Earth as rain, snow, or hail in a continuous cycle. Which is the correct sequence for these processes?
a) condensation, evaporation, and runoff
b) runoff, transpiration, and evaporation
c) evaporation, condensation, and precipitation
d) precipitation, evaporation, and transpiration
C- evaporation, condensation, precipitation
Which statement is true of evaporation on a cloudy day?
a) Evaporation does not occur on a cloudy day.
b) Evaporation occurs at a faster rate on a cloudy day.
c) Evaporation occurs at a slower rate on a cloudy day.
c) Evaporation occurs at a slower rate on a cloudy day.
A long, round balloon is fastened to the end of a toy rocket. When the balloon is blown up and released, the rocket launches into the air. Which force causes the rocket to launch?
a) the mass of the balloon
b) the weight of the rocket
c) the pull of gravity on the rocket
d) the air released from the balloon
D- The air released from the balloon
Why do planets stay in orbit around the Sun?
a) attraction of gravity
b) effect of inertia
c) frictional force
d) rotational force
A- attraction of gravity
Which best demonstrates a physical change?
a) lighting a match
b) chalk dissolving in an acid
c) plastic melting into a liquid
d) the color of metal changing when it reacts with oxygen
A container is placed in front of a heat lamp. After a few hours, water droplets begin to form on the container. Which part of of the water cycle does this best demonstrate?
a) evaporation
b) precipitation
c) transpiration
d) condensation
D- condensation
Which process impacts the water cycle by drawing water vapor from plant leaves?
a) evaporation
b) condensation
c) precipitation
d) transpiration
D- transpiration
Otto pushed a toy car across a floor. The car traveled fast across the wood, but it slowed to a stop on the carpet. Which BEST explains what happened when the car reached the carpet?
a) Inertia decreased.
b) Gravity increased.
c) Friction increased.
d) Magnetism decreased.
C- friction increased
Maria pulled an empty cart to the library. When she leaves the library, the cart is full of books. How does the force of friction on the cart change?
a) The force of friction increases because there is more mass.
b) The force of friction decreases because there is more air pressure.
c) The force of friction increases because the force of gravity decreases.
d) The force of friction stays the same because Maria is still pulling the cart with the same force.
a) The force of friction increases because there is more mass.
Which is an example of a physical change?
a) ice melting into water
b) fire burning a sheet of paper
c) a nail rusting after being outside
d) a penny turning green when placed in chemicals
A- ice melting into water
Since Earth radiates heat into outer space, why is Earth’s surface NOT becoming colder?
a) Earth constantly takes in more heat from the Sun.
b) Earth has forests that provide heat through photosynthesis.
c) Earth has oceans that store heat.
d) Earth absorbs extra heat from molten lava.
A- Earth constantly takes in more heat from the Sun
Which are most likely to increase transpiration?
a) increased runoff and increased cloud cover
b) increased runoff and decreased cloud cover
c) decreased runoff and increased cloud cover
d) decreased runoff and decreased cloud cover
b) increased runoff and decreased cloud cover