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Science Exam Ch7
| Question | Answer |
|---|---|
| something is in motion if it | changes position |
| movement occurs when an object moves relative to a | reference point |
| displacement measures the _________between the starting and stopping points | distance & direction |
| is distance divided by time | speed |
| an object that travels 100 m in 20 s has what speed | 5 m/s |
| the _______ measures the speed during an entire trip | average speed |
| at the beginning of a track race the instantaneous speed of all runners is | 0 m/s |
| when you graph speed, time is on the | x-axis |
| when a car goes around a curve at 20 mph, the ____________changes | velocity |
| average speed is found by | dividing the total distance by the travel time |
| is the speed of an object at any instant of time | instantaneous speed |
| a bicycle rider travels 15 km in 1.25 hours. what is the rider's average speed | 12 km/h |
| if a student leaves home at 7:30 a.m. to walk to his school 2 km away, stops at a neighbor's house for 15 minutes, then arrives at school at 8:00 a.m. what is the student's average speed for the trip tpo school | 4 km/h |
| if a runner maintains a constant speed of 12 km/h, how long will it take him to complete a marathon race of 26.2 miles | 3.52 h |
| the direction & speed of an object is described by its | velocity |
| is the change in velocity divided by the time needed for the change to occur | acceleration |
| which of the following is NOT an acceleration | riding your bike straight down the street at a constant speed |
| if a car is traveling 100 km/h and comes to a stop in 3 min, what is the car's acceleration | -0.15 m/s2 |
| is a force that resists motion between two surfaces that are in contact | friction |
| friction always acts ___________ the direction of motion | opposite to |
| __________ measures the quantity of matter of an object | mass |
| you are moving a dresser that has a mass of 36 kg, its acceleration is 0.5 m/s2. what is the force being applied? | 18 N |
| a ball is thrown straight up in the air. according to Newton's first law of motion what is the reason for the ball falling back to Earth | the change in the ball's acceleration is proportional to the force acting on it |
| force pairs act in _________ and are _______ in size | opposite directions, always equal |
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