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How does the force of the lifter compare with the weight of the barbell at different stage of the lifter?
At the beginning of the lift, the lifter's force is greater than the weight of the barbell to overcome inertia and initiate movement. During the middle of the lift, the lifter's force is equal to the weight of the barbell to maintain constant velocity. Towards the end of the lift, the lifter's force is less than the weight of the barbell due to deceleration and control.
Are the forces acting on the weight lifter and the weights balanced or unbalanced?
The forces acting on the weight lifter and the weights are balanced when the weight lifter is holding the weights stationary. The force exerted by the weight lifter is equal and opposite to the force of gravity acting on the weights.
If a weight lifter is holding barbells above his head what does he have to do to perform work?
The weight lifter needs to apply force to the barbells and move them over a distance in the direction of the force being applied. Work is calculated as force multiplied by distance, so by exerting force to lift the barbells overhead, the weight lifter is performing work against gravity.
What two types of force would a weight lifter use to lift barbells above his head?
The weight lifter would typically use muscular force generated by their muscles to lift the barbells, as well as gravitational force to overcome the weight of the barbells as they move upward.
What are the forces acting on the weight lifter and the weight?
(using squats for the sake of explanation) The lifter exerts an action force on the weight, which is in the opposite direction to gravity. The lifters shoulders also experience the reaction force (from the weight - otherwise, the weight would pass through the lifter or vice versa). The feet of the lift also experience a reaction force, which, combined with the shoulder-reaction force, is equal to the action force (Newton's Third Law). The feet also experience friction on the floor surface in opposite directions (which cancel out, so the lifter is stationary on the ground) :)
How does the force of the lifter compare with the weight of the barbell at different stage of the lifter?
At the beginning of the lift, the lifter's force is greater than the weight of the barbell to overcome inertia and initiate movement. During the middle of the lift, the lifter's force is equal to the weight of the barbell to maintain constant velocity. Towards the end of the lift, the lifter's force is less than the weight of the barbell due to deceleration and control.
Are the forces acting on the weight lifter and the weights balanced or unbalanced?
The forces acting on the weight lifter and the weights are balanced when the weight lifter is holding the weights stationary. The force exerted by the weight lifter is equal and opposite to the force of gravity acting on the weights.
If a weight lifter is holding barbells above his head what does he have to do to perform work?
The weight lifter needs to apply force to the barbells and move them over a distance in the direction of the force being applied. Work is calculated as force multiplied by distance, so by exerting force to lift the barbells overhead, the weight lifter is performing work against gravity.
What two types of force would a weight lifter use to lift barbells above his head?
The weight lifter would typically use muscular force generated by their muscles to lift the barbells, as well as gravitational force to overcome the weight of the barbells as they move upward.
What are the forces acting on the weight lifter and the weights.?
(using squats for the sake of explanation) The lifter exerts an action force on the weight, which is in the opposite direction to gravity. The lifters shoulders also experience the reaction force (from the weight - otherwise, the weight would pass through the lifter or vice versa). The feet of the lift also experience a reaction force, which, combined with the shoulder-reaction force, is equal to the action force (Newton's Third Law). The feet also experience friction on the floor surface in opposite directions (which cancel out, so the lifter is stationary on the ground) :)
What are the forces acting on the weight lifter and the weight?
(using squats for the sake of explanation) The lifter exerts an action force on the weight, which is in the opposite direction to gravity. The lifters shoulders also experience the reaction force (from the weight - otherwise, the weight would pass through the lifter or vice versa). The feet of the lift also experience a reaction force, which, combined with the shoulder-reaction force, is equal to the action force (Newton's Third Law). The feet also experience friction on the floor surface in opposite directions (which cancel out, so the lifter is stationary on the ground) :)
What simple machine is a dumbell?
A dumbbell is considered a type of lever, specifically a class 1 lever. In this case, the fulcrum is the point where the dumbbell is held, the effort is the force applied by the person lifting the dumbbell, and the load is the weight of the dumbbell itself. By applying force at one end of the lever (lifting the dumbbell), the load (weight) at the other end can be moved, making it easier to perform exercises and build strength.
What are the forces acting on a weight lifter and the weights?
(using squats for the sake of explanation) The lifter exerts an action force on the weight, which is in the opposite direction to gravity. The lifters shoulders also experience the reaction force (from the weight - otherwise, the weight would pass through the lifter or vice versa). The feet of the lift also experience a reaction force, which, combined with the shoulder-reaction force, is equal to the action force (Newton's Third Law). The feet also experience friction on the floor surface in opposite directions (which cancel out, so the lifter is stationary on the ground) :)
How much work is done a weight lifter when he hold a weight of 80 kg on his shoulder for 2 minutes?
The work done by the weight lifter holding a weight of 80 kg on his shoulder for 2 minutes is zero, assuming he remains stationary. Work is calculated as force multiplied by displacement in the direction of the force, and since there is no displacement in this case, no work is done.
How much force are you exerting when you lift a 50 pound dumbbell?
Any force that is more than 50 pounds will lift a 50-pound object. The greater the force is, the greater the object's upward acceleration, and the sooner the object will reach any given height.
How much work is done by a weight lifter when he holds a weight of 80Kg on his shoulders for two minutes?
The work done would be zero, since the weight lifter is not moving the weight vertically. Work is defined as force applied in the direction of motion. Holding a weight in a static position does not result in any work being done.
Explain how newtons 1st law applies to the clean and jerk?
Newton's 1st law states that an object will remain at rest or in uniform motion unless acted upon by an external force. In the clean and jerk, this law applies during the clean phase where the lifter accelerates the barbell from the floor to the shoulders by exerting force to overcome inertia. In the jerk phase, the law comes into play when the lifter applies force to lift the barbell overhead against gravity.
