Physics revision - Year 10 (Force, Energy, work, momentum)

A lift is accelerating downwards. The forces acting on it are a weight of 2000N downward and a force of tension in the supporting cable of 1760N upward. What is the resultant force acting on the lift?

• 240N upward

• 2000N downward

• 1760N upward

• 240N downward

A 10kg ball is moving with speed of 50 m/s, what is is the momentum of the ball?

• 200 m/s

• 100 m/s

• 500 kg m/s

• 500 m/s

What is the unit of measure for momentum?

• m/s

• kg m/s

• m/s²

• kg

A boy lifts a packet from the ground onto a bench by applying a constant force. The energy of the package on the bench has higher_______________ than when it was on the ground

• kinetic energy

• potential energy

• kinetic and potential energy

• work

An object moving in a straight line at constant velocity has kinetic energy E and momentum p. If the speed of the object is doubled, the new value of kinetic energy and momentum will be....

• KE = 2E Momentum = 2p

• KE = 2E Momentum = 4p

• KE = 4E Momentum = p

• KE = 4E Momentum = 2p

A person lifts a heavy load to a vertical height of 2m in 3 seconds. If he/she had done this more slowly in 6 seconds, the work on the load would have been....

• twice as great

• four times as great

• the same

• half as great

At what height above the ground must a mass of 10kg be to have a potential energy equal to the kinetic energy possessed by a mass of 10kg moving with a velocity of 20 m/s?

• 10m

• 20m

• 50m

• 100m

A girl runs up one flight of steps. Which one of the following factors does not affect the work done by the girl against gravity?

• mass of the girl

• height of the steps

• speed of the girl

• acceleration due to gravity

What unit is weight measured in?

• Kg

• N

• J

• m/s

What unit is mass measured in?

• N

• J

• m/s

• Kg