Work Energy Power Review

Work is done when 1.the displacement is not zero and a force is parallel to the displacement 2.the displacement is zero. 3.the force is zero. 4.the force and displacement are perpendicular.

Which of the following is an example of mechanical energy? 1.Kinetic 2.Elastic Potential 3.Gravitational Potential 4.All of the above Answer Now

A 75kg man and a 55kg woman perform dives on adjacent diving boards of the same height. Which of them will have a greater kinetic energy entering the water? 1.The man 2.The woman 3.Both will be the same 4.Unable to be determined

A 75kg man and a 55kg woman perform dives on adjacent diving boards of the same height. Which of them will have a greater speed entering the water? 1.The man 2.The woman 3.Both will be the same 4.Unable to be determined

If both the mass and the height of a ball are doubled, the potential energy of the ball is increased by a factor of ½

If both the mass and the velocity of a ball are tripled, the kinetic energy of the ball is increased by a factor of

Of the following examples, the one that represents work as defined by a scientist is: 1.lifting a book from your desk. 2.leaning on a shovel while others labor. 3.pushing hard against a wall for an hour. 4.carrying a heavy box on your head.

Which of the following represents the capacity to do work? 1.Power 2.Energy 3.Force 4.Acceleration 5.Velocity Answer Now

A machine that does more work than another must have moved the object is a shorter amount of time? 1.True 2.False Answer Now

Which of the following represents the rate that work is being done? 1.Power 2.Kinetic Energy 3.Potential Energy 4.Total Energy

A mouse and a raccoon race to the top of a tree for the last morsel of food left before winter. Both arrive at the top at the same time. Which had more power? 1.Mouse 2.Raccoon 3.Same 4.Unable to be determined

A linebacker pushes against the blocker but the blocker does not move. The work is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

When doing a bench press, you gradually raise the bar. The work done by gravity is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

When doing a bench press, you gradually lower the bar down to your chest. The work done by your arms is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

Because your two-year old cousin refuses to move, you pull him along the ground. The work done by friction is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

A rolling wagon has 50 joules of kinetic energy. If the wagon’s velocity is doubled, the kinetic energy of the wagon: 1.is reduced to 25 joules. 2.is increased to 100 joules. 3.is increased to 200 joules. 4.remains the same.

In a closed system, what is constant? 1.Potential energy 2.Kinetic energy 3.Mechanical energy 4.All are constant Answer Now

Two rescue packages of equal mass are dropped from planes of different altitude - red plane at 1500m and a blue plane at 2500m. Which of them will have a greater speed hitting land? 1.Red plane’s package 2.Blue plane’s package 3.Both will be the same 4.Unable to be determined