Review for Forces Test. Describe an objects velocity and acceleration when the net force is zero? Describe an objects velocity and acceleration.

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Presentation transcript:

Review for Forces Test

Describe an objects velocity and acceleration when the net force is zero? Describe an objects velocity and acceleration when the net force is not zero?

Which of the following objects has more inertia?

A student pushes on two blocks. The blocks are moving to the right. Block A has more mass than block B. There is friction between the blocks and the table. If the blocks are moving at a constant speed, which of the following statements is true about the magnitude of the forces? a.The forces that block A exerts on block B is greater than the force that block B exerts on block A. b.The forces that block A exerts on block B is less than the force that block B exerts on block A. c.The forces that block A exerts on block B is equal to the force that block B exerts on block A. d.They cannot be compared unless we know how fast the blocks are slowing down.

A student pushes on two blocks. The blocks are moving to the right. Block A has more mass than block B. There is friction between the blocks and the table. If the blocks are moving at a constant speed, which of the following statements is true about the magnitude of the forces? a.The forces that block A exerts on block B is greater than the force that block B exerts on block A. b.The forces that block A exerts on block B is less than the force that block B exerts on block A. c.The forces that block A exerts on block B is equal to the force that block B exerts on block A. d.They cannot be compared unless we know how fast the blocks are slowing down.

What is weight? Explain how weight can change. If an object on earth has a mass of 7 kg, what is its weight? If an object weights 900 N on earth, what is its mass? What would its weight be on the moon where g=1.62 m/s/s?

If a 50 N horizontal force to the right and a 20 N force to the left are acting on a 15 kg object simultaneously, what will the acceleration of the object be?

A rock with a weight of 10 N is resting on a table. A student makes a number of statements about this situation. The normal force exerted on the rock by the table is a force of 10 N; the reaction force to this normal force is a force of 10 N exerted on the rock by gravity in the downward direction. What if anything is wrong with this statement? If something is wrong, identify it and explain how to correct it. If it is correct, explain why.

Draw a free body diagram of an object for each of the following scenarios. A hockey puck accelerating to the right over the ice. A penny in free fall. A penny in terminal velocity. A dog at rest on his bed. A desk being pushed across the carpet at a constant velocity.

How could you show an unbalanced force using a velocity time graph? Acceleration graph? Position graph?

A 36 kg kid on ice skates is pushed with a force of 97 N. How would the kid accelerate?