Question

1) A constant force is exerted on a cart that is initially at rest on a track. Friction between the cart and the track is negligible. The force acts for a short time interval and gives the cart a certain final speed. To reach the same final speed with a force that is only half as big, the force must be exerted on the cart for a time interval ______________ that for the stronger force. a. Four times as long as b. Twice as long as c. Equal to d. Half as long as e. One quarter as long as 2) Driving down the road you hit the brakes suddenly. As a result, your body moves toward the front of the car. Explain, using Newton’s laws.

          1) A constant force is exerted on a cart that is initially at
rest on a track. Friction between the cart and the track is
negligible. The force acts for a short time interval and gives the
cart a certain final speed. To reach the same final speed with a
force that is only half as big, the force must be exerted on the
cart for a time interval ______________ that for the stronger
force.
a. Four times as long as
b. Twice as long as
c. Equal to
d. Half as long as
e. One quarter as long as
2) Driving down the road you hit the brakes suddenly. As a
result, your body moves toward the front of the car. Explain, using
Newton’s laws.

Added by Joel F.

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