Which of the following does work?
a person pushing a book across the floor
Which of the following will increase the amount of work you do pushing a box?
increasing the distance you push the box
When you do work on an object, you transfer
Alice stands at the edge of a low diving board. If whe stands on a higher diving doard instead, she will
increase her potential energy
A truck has twice the mass of a car. If the truck and the car are traveling at the same velocity,
The truck has twice the kinetic energy of the car
A rock rolling down a hill has a kinetic energy of 500 J and a potential energy of 3500 J. Its mechanical energy is
A freestyle skier skis off a ramp and does a maneuver in midair. As he does his trick, he has
both potential and kinetic energy
Tom uses a crane to lift a box. The crane always does the same amount of work to lift the box. Tom could increase the crane's power by
increasing the speed with which it lifts the box
Power is the rate at which work is done. This means that the power an object has is equal to the work it is doing divided by the
time it takes to do the work.
The work a force does on an object depends on the
the size of the force and the distance it acts over
A classmate lifts a book 50cm. You lift the same book 150 cm using the same force. Compared to your to your classmate, you have done
three times the work
Work can be measured in units called
Sean pushes a cart 100m. Which of the following statements is TRUE?
Sean does work on the cart over the entire 100m.
When Roger kicks a football, the football gains mechanical energy because Roger
does work on the football
Amanda holds a 5 kg ball over her head at a height of 2 m. What is the gravitational potential energy (GPE) of the ball? The formula for GPE is GPE = mgh, where g=9.8 m/s2.
Cullen has a mass of 50 kg. When he rides his bike at a velocity of 3 m/s, what is his kinetic energy? The formula for kinetic energy is KE = 1/2mv2
To find the mechanical energy of an object,
add its kinetic energy and potential energy
The aisles of the grocery store are 10 m long. If cart A is being pushed with 48Ns of force and cart B is pushed with 24Ns of force. How much work does it take to move cart A the length of an aisle?
If you push cart A down the aisle in 60 s, what is your power? The force being 48 and the distance is 10m. The formula is P=W/t
Brian wants to slide a chair across a carpeted floor. He could reduce the effect of friction by
putting a plastic sheet on the floor before he slides the chair
The strength of the gravitational force between two objects depends on the objects'
masses and the distance between them
The mass of the moon is about 1/6 the mass of Earth. What would be the weight of an object on the moon if its weight on Earth was 360 N?