Exploring Density
Which of the following statements about the density of liquids is true?
A. All liquids have the same density
B. The density of all liquids is always 1.0 g/ml
C. Liquids may have different densities
D. The density of liquids depends on the amount of liquid present
C. Liquids may have different densities
Which of the following is true if the forces on a moving object are balanced?
A. The object will keep moving at a constant speed
B. The object will speed up
C. The object will slow down
D. The object will change direction
A. The object will keep moving at the same speed
A simple machine that is attached to a surface and uses a stationary grooved wheel through which a rope/belt/chain runs
Pulley
Luke puts chocolate syrup in his milk. The syrup will spread most quickly in...
A. Hot milk
B. Warm milk
C. Cold milk
A. Hot milk
What two properties of matter can be used to calculate density?
A. Mass and volume
B. Mass and shape
C. Volume and shape
D. Shape and texture
A. Mass and volume
A book bag with a mass of 10 kg and a pencil case with a mass of .1 kg are dropped from a high place. What will happen to the objects?
A. The book bag will accelerate faster and land first
B. The book bag and pencil case will accelerate at the same rate and land together
C. The pencil case will accelerate faster and land first
B. The book bag and pencil case will accelerate at the same rate and land together
A simple machine consisting of a sloped surface
Inclined plane
Which of the following is the best explanation for why the body sweats?
A. As perspiration is produced, the warmth of the body is pushed inside the body
B. Perspiration contains water, and water warms the skin
C. As perspiration evaporates, it cools the body
D. Perspiration drains the body of its cool liquids
C. As perspiration evaporates, it cools the body
Where would a person have the easiest time floating?
A. In the ocean
B. In a fresh water lake
C. He will float just as well in an ocean and a lake
D. He will not float in an ocean or a lake
A. In the ocean
Which of the following statements are true if you are observing 2 books: Book A has a mass of 2 kg and Book B has a mass of 4 kg.
A. The force of gravity is less on Book A than Book B
B. Book B has less weight than Book A
C. Book A has greater mass than book B
D. The force of friction on Book A will be greater than Book B
A bar or board that is rested on a support called a fulcrum
Lever
Alec knows that when he adds Substance X to Substance Y, an endothermic reaction occurs. The initial temperature of Substance Y is 24 degrees. After the substances are combined will, the temperature of Substance Y increase, decrease, or stay the same?
Decrease
What types of matter have density?
A. Gasses
B. Liquids
C. Solids
D. All of the above
D. All of the above
Peter drops a tennis ball. What will happen to it?
A. The ball will fall at a constant speed of 9.8 m/s
B. The ball will fall at a speed that depends on the ball's mass
C. The ball will accelerate towards the ground at 9.8 m/s^2
D. The ball will accelerate towards the ground at a rate that depends on the ball's mass
C. The ball will accelerate towards the ground at 9.8 m/s^2
This simple machine is made of a circular frame that revolves around a rod.
Wheel and axle
Which of the following statements is true?
A. The greater the mass of the sample, the more quickly heat is transferred.
B. The smaller the mass of the sample, the more quickly heat is transferred.
C. The smaller the mass of the sample, the more slowly heat is transferred.
D. The mass of the sample does not affect the transfer of heat.
B. The smaller the mass of the sample, the more quickly heat is transferred.
Calculate the density of an object if the mass is 250 grams and the volume is 50 milliliters.
5 g/ml
An unbalanced force causes an object to...
A. Change direction
B. Speed up
C. Slow down
D. Any of the above
D. Any of the above
This simple machine is an inclined plane wrapped around a cylinder to form a spiral
Screw
A room temperature metal spoon is placed in a beaker of ice water. After 15 minutes, the spoon is colder than it was before. Which best explains why the spoon is colder?
A. Heat was transferred from the water to the spoon
B. Heat was transferred from the spoon to the water
C. Heat was transferred from the air to the water
D. Heat was transferred from the air to the spoon
B. Heat was transferred from the spoon to the water