Quiz Standard 7 Answer Key
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- Explanation: The weight is the product of the mass and acceleration due to gravity, wherever it is located.
- Explanation: At this temperature, sound travels at 345
- Explanation: Critical to either platoons success is the total mass of the team.
- Explanation: According to the data table, the acceleration due to gravity of 9.8 m/s/s is supported.
- Explanation: In science lab, a spring scale is used to measure weight in units called Newtons.
- Explanation: A single fixed pulley does not decrease the amount of effort force. Instead it changes the direction of the force.
- Explanation: You can decrease the effort force needed to push a weight up the ramp if you increase the length of the ramp.
- Explanation: The correct answer is action and reaction forces
Explanation: The weight is the product of the mass and acceleration due to gravity, wherever it is located. That is why the formula W=mg is used to determine weight. g, acceleration due to gravity, changes depending upon location. 28) 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.
Explanation: At this temperature, sound travels at 345
. This can be determined by dividing the distance (100m) by the time (0.29s). 29) 
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?
Explanation:_You_can_decrease_the_effort_force_needed_to_push_a_weight_up_the_ramp_if_you_increase_the_length_of_the_ramp.'>Explanation:_A_single_fixed_pulley_does_not_decrease_the_amount_of_effort_force._Instead_it_changes_the_direction_of_the_force.'>Explanation:_In_science_lab,_a_spring_scale_is_used_to_measure_weight_in_units_called_Newtons.'>Explanation:_According_to_the_data_table,_the_acceleration_due_to_gravity_of_9.8_m/s/s_is_supported.'>Explanation:_Critical_to_either_platoons_success_is_the_total_mass_of_the_team.'>Explanation: Critical to either platoon's success is the total mass of the team. The greater the mass, the more force required to move the team. 30) Acceleration due to Gravity
To test Newton's law of gravity, Ben and Jerry climbed the football stadium at school and dropped an egg from the very top of the bleachers. Their egg drop data can be seen in the table. According to this data, what conclusion can the boys make regarding Newton's law of gravity?
Explanation: According to the data table, the acceleration due to gravity of 9.8 m/s/s is supported. Each time interval indicates an increase of 9.8 m/s. In other words, if the acceleration is 9.8 m/s/s after one second, then after 4 seconds, the acceleration is 4 X 9.8 m/s/s or 39.2 m/s/s. 31) 
In the science lab, this piece of equipment is used to measure the force of gravity on an object or its ________________ in units called ________________.
Explanation: In science lab, a spring scale is used to measure weight in units called Newtons. Although you and I measure our weight in pounds, the correct SI unit is Newtons. 32) 
How does a single fixed pulley, like the one seen here, help you do work?
Explanation: A single fixed pulley does not decrease the amount of effort force. Instead it changes the direction of the force. You pull down and the weight moves up. 33) 
How can you decrease the effort force needed to push a weight to the top of the ramp?
Explanation: You can decrease the effort force needed to push a weight up the ramp if you increase the length of the ramp. You could also decrease the height of the ramp. 34)
Which statement BEST explains why the person and the raft moved in opposite directions?
Explanation: The correct answer is action and reaction forces The action force is the person pushing on the raft. The reaction force is the raft pushing back, causing the person to move in the opposite direction of the raft. 35) 
Where should the fulcrum be located in this lever to get the greatest mechanical advantage?
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