A car's engine provides a forward force of 2500N while the force of air resistance is 725N in the opposite direction. With what force will the car move, and in what direction?(1 point)
Responses
1775 N backward
1775 N backward
1775 N forward
1775 N forward
3225 N forward
3225 N forward
3225 N backward
The car's engine provides a forward force of 2500N, while the force of air resistance is 725N in the opposite direction. To determine the net force and direction of the car's movement, we subtract the force of air resistance from the force of the engine:
2500N - 725N = 1775N
Therefore, the car will move with a force of 1775N in the forward direction.
Two movers are attempting to push a couch up a ramp. One mover applies f force of 90 N to the right, but the force of friction between the couch and the ramp provides a force of 115N in the opposite direction, and the couch slides down the ramp. At a minimum, how much force will the second mover need to apply to help push the couch up the ramp?
To find the minimum force the second mover needs to apply to help push the couch up the ramp, we need to determine the net force required to overcome the force of friction.
The first mover applies a force of 90N to the right, which is the desired direction. However, the force of friction between the couch and the ramp is 115N in the opposite direction. To counteract this force and have a net force of zero (since the couch is not accelerating), the second mover needs to apply a force equal in magnitude but opposite in direction to the force of friction.
Therefore, the second mover needs to apply a force of 115N in the right direction to cancel out the force of friction.
Two movers are attempting to push a couch up a ramp. One mover applies f force of 90 N to the right, but the force of friction between the couch and the ramp provides a force of 115N in the opposite direction, and the couch slides down the ramp. At a minimum, how much force will the second mover need to apply to help push the couch up the ramp?
(1 point)
Responses
90N
90N
26N
26N
205N
205N
25N
To push the couch up the ramp, the total force applied must be greater than the force of friction.
Here, the force of friction is 115N in the opposite direction to the desired motion.
The first mover applies a force of 90N to the right.
To find the minimum force the second mover needs to apply, we subtract the force of friction from the force applied by the first mover:
90N - 115N = -25N
The negative sign indicates that the force should be in the opposite direction to the force of friction, which is uphill.
Therefore, the second mover needs to apply a force of 25N in the opposite direction to help push the couch up the ramp.
A model rocket has a mass of 0.2kg, with a motor that can provide a force of 100N. A second model rocket is being built with the same motor, but it is being designed to accelerate one-fourth as much as the first rocket. What kind of change can be made in the design to achieve this objective?(1 point)
Responses
The mass of the second rocket should be 0.2kg
The mass of the second rocket should be 0.2kg
The mass of the second rocket should be 1.2 kg.
The mass of the second rocket should be 1.2 kg.
The mass of the second rocket should be 0.4kg
The mass of the second rocket should be 0.4kg
The mass of the second rocket should be 0.8 kg
To achieve one-fourth of the acceleration of the first rocket, the second rocket needs to have a mass four times greater than the mass of the first rocket. This can be achieved by increasing the mass of the second rocket.
Therefore, the correct response is:
The mass of the second rocket should be 0.8 kg.
If a soccer ball's mass is 5kg and a player, who weighs 50kg, kicks the soccer ball forward with a force of 5N, how much force does the ball exert on the player's foot and in what direction? Think of Newton's third law!(1 point)
Responses
5N backward
5N backward
10kg/N backward
10kg/N backward
100kg forward
100kg forward
5N forward
5N forward
According to Newton's third law, for every action, there is an equal and opposite reaction. This means that the force exerted by the ball on the player's foot is equal in magnitude but opposite in direction to the force exerted by the player on the ball.
Since the player kicks the ball forward with a force of 5N, the ball will exert an equal force of 5N on the player's foot in the opposite direction.
Therefore, the correct response is:
5N backward