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Which car is accelerating?
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Newton's second law states that F = m x a (Force is mass times acceleration). Which example would have the GREATEST acceleration?
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Science test
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| Question | Answer |
|---|---|
| Which car is accelerating? | a car that rounds a curve at a constant speed |
| Newton's second law states that F = m x a (Force is mass times acceleration). Which example would have the GREATEST acceleration? | a 10 kg ball thrown with a 50 Newton force |
| The acceleration of an object would increase if there was an increase in the | force on the object. |
| A cup of coffee sits on the dashboard of an automobile. The car goes around a sharp curve. Even though you hold the cup still, coffee still splashes out. This can best be explained due to | inertia. |
| If Shane and Susan both push on a box with a force of 25N, but in opposite directions, what will happen to the box? | The box will not move. |
| You have all your friends on a conference call on your cell phone and tell them to let you know when they see a book you drop out your window pass by their window. Which statement is true of the amount of time it takes to pass by each window? | the time interval between floors becomes less each time |
| You decide to take a picture every 0.5 seconds of your physics teacher as she drops a watermelon off the top of the school. you realize that the distance the watermelon falls from the teacher in each new picture is | gradually more in each picture |
| Assuming the downward direction to be positive, the acceleration of gravity is about 10 m s2 . This means that | the velocity of a falling body increases by 10 every second |
| Mass is measured in ____________, and weight is measured in ______________. | kilograms, newtons |
| Which measures the mass of an object? | a triple beam balance (in grams) |
| Which piece of lab equipment is used to measure the mass of a chemical sample? | balance |
| Which statement is true about your mass? | You would have the same mass on the Earth and moon. |
| In which situation is the acceleration of the car negative? | The velocity of a car reduced from 50 km/h to 35 km/h over one minute. |
| A car traveled at a constant velocity of 70 mph from noon to 2:00 pm. At 3:00 pm the velocity of the car was 80 mph; and finally at 4:30 pm the velocity of the car was 40 mph. Which statement accurately describes the acceleration of the car? | The car had a positive acceleration between 2:00 pm and 3:00 pm |
| 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 | inertia |
| A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why this occurred? | The opposing force of friction stopped the train. |
| Why does a raindrop accelerate as it falls to the earth? | because the force of the earth pulls on the drop |
| Why does a skydiver accelerate as she falls to the earth before opening her chute | because the force of the earth pulls on her |
| The planet Jupiter has an acceleration due to gravity that is approximately 2.4 times as much as the earth (23.2 m s2 ). Which of these statements is true regarding if you were to travel to Jupiter and land on its surface? | Your weight would increase by a factor of 2.4. |
| What is the relationship between the weight of a cellphone and its mass (0.26 kg)? | The weight is the product of the mass and acceleration due to gravity, wherever it is located. |
| At 25°C, sound can travel 100 meters across a football field in 0.29 seconds. Determine the velocity of these sound waves in the direction they travel across the field | m/s 345 |
| Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is critical to either platoon's win? | total mass of the team |
| Hail stones do a lot of damage when they fall to the Earth and hit homes and cars with great force. They hit with great force because they | accelerate as they fall to Earth. |
| What can we say about the rock as it falls to Earth? (The rock is falling from 60 feet) | It accelerates as it falls. |
| Astronauts appear weightless while working in the International Space Station because | they are in a state of free fall. |
| n the science lab, this piece of equipment is used to measure the force of gravity on an object or its ________________ in units called ________________. | weight; Newtons |
| A person is on a raft. The person exerts a force on the raft, causing the raft to move. The person also moves in the opposite direction. Which statement BEST explains why the person and the raft moved in opposite directions | action and reaction forces |
| When Jackson throws a tennis ball in a straight path, what two forces cause the ball to eventually stop moving? | gravity and friction |
| In which situation is the object experiencing unbalanced forces? | A car slowing as it reaches a traffic light. |
| A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion | The box will experience acceleration. |
| Why does Earth orbit the Sun rather than any other body in the solar system? | The Sun is the most massive object; gravitational attraction is related to mass. |
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