Physical Science Mid Term 2020

Which car is accelerating?

• a car that is unmoving

• a car that rounds a curve at a constant speed

• a car that travels in straight line at a constant speed

• a car that is set to a constant speed of 60 miles per hour

When gasoline is burned in a car engine, ________ energy is converted into _________ energy.

• heat, chemical

• chemical, potential

• mechanical, chemical

• chemical, mechanical

A 10.0 kilogram mass of iron on earth exerts a downward force of 98 Newtons. On the moon this same 10.0 kilograms of iron is weighed and found to exert a downward force of 16.3 Newtons. How is this possible?

• The earth is farther away reducing the pull.

• Mass begins to evaporate in the vacuum of space.

• Weight is the same everywhere, but mass changes.

• The gravity on the moon is one sixth the gravity of Earth.

Which is an example of electrical energy being converted or changed into light energy?

• the sun

• a light bulb

• a solar panel

• a glowstick at Halloween

You are sitting in a car that isn't moving; suddenly, the car quickly accelerates. Your body seems to be pushed back against the seat. Which word best explains why your body seemed to be pushed backward against the seat?

• newton

• vector

• inertia

• gravity

Why does an object in motion stay in motion unless acted on by an unbalanced force?

• because forces are what stop and start motion

• B)because balanced forces cannot exist in nature

• because motion is the inherent state of all matter

• because motion, once begun, continues to accelerate

Which is an example of gaining a static charge by conduction?

• Rubbing a balloon against your hair.

• Shuffling your shoes across a carpet.

• Bringing a charged rod near an electroscope

• Touching your car on a cold day and getting a shock.

During what part of their drive is the car not moving?

• From 0 to 0.75 hours

• From 1.25 to 2.0 hours

• From 0.75 to 1.25 hours

• They are moving the entire time.

The graph represents the distance a car travels over time while on the highway. Which statement about the car's trip is accurate?

• The car does not move over time.

• The car travels at a constant velocity.

• .The car's velocity increases constantly over time.

• The car's velocity decreases constantly over time.

Mike wants to negatively charge a small rubber ball. Which of these methods would successfully charge the ball?

• heating the ball in boiling water

• running the ball over a strong magnet

• rubbing the ball back and forth on carpet

• dropping the ball from a tall buliding