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# AS-Level physics.....Force Question? Watch

1. A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch.the cable is at an angle of 15° to the horizontal.

IF the tension in the cable is 4kN show that:
1) the frictional force opposing the motion of the boat is about 3.9kN
2)The normal reaction of the sand on the boat is about 7kN
2. (Original post by reb0xx)
A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch.the cable is at an angle of 15° to the horizontal.

IF the tension in the cable is 4kN show that:
1) the frictional force opposing the motion of the boat is about 3.9kN
2)The normal reaction of the sand on the boat is about 7kN
Draw a force diagram and resolve forces parallel to direction of motion. Then use F=ma to find the frictional force.
3. (Original post by reb0xx)
A boat of mass 800kg is pulled along the sand at constant velocity by a cable attached to a winch.the cable is at an angle of 15° to the horizontal.

IF the tension in the cable is 4kN show that:
1) the frictional force opposing the motion of the boat is about 3.9kN
2)The normal reaction of the sand on the boat is about 7kN
How much have you done? For starters, drawing a diagram is really helpful and after that, you've gotta resolve.

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Updated: December 6, 2010
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